JP3042664B2 - Optical frequency selection switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical frequency selection switch for selecting an arbitrary plurality of optical signals from a plurality of frequency-multiplexed optical signals and connecting them to an optical path.

[0002]

2. Description of the Related Art Optical frequency division multiplexing (FD) in which a plurality of optical signals are assigned to different optical frequencies and transmitted through one optical fiber.
M) The transmission system can greatly increase the capacity of the transmission path. To construct an optical transmission network using this optical FDM system, an optical frequency selection switch that can select an arbitrary optical frequency signal on a transmission line or switch an arbitrary optical frequency signal between a plurality of transmission lines is required. It is.

FIG. 6 shows a conventional 2 × type using a ring resonator.
FIG. 4 is a schematic plan view showing a two-optical-frequency selection switch. In the figure, reference numeral 30 denotes a first input waveguide, 31 denotes a second input waveguide, 32 denotes a first directional coupler, 33 denotes a ring waveguide,
34 is a second directional coupler, 35 is a first output waveguide,
36 is a second output waveguide, 37 is a thin-film heater for adjusting the resonance frequency using the thermo-optic effect, and 38 is a substrate.

Here, the ring length L of the ring waveguide 33
_ring, the optical frequency f ₂ is set as follows so that the resonance frequency.

[0005]

(Equation 1)

In the formula, J is an integer, c is the speed of light, and _ne is the effective refractive index of the ring waveguide.

Optical signals multiplexed by optical frequency (f _{1 to} f ₄ )
Is input from the first input waveguide 30, the optical frequency f ₂
Is resonated by the first ring resonator including the two directional couplers 32 and 34 and the ring waveguide 33, and is guided to the second output waveguide 36.

On the other hand, since the optical signals of the optical frequencies f ₁ , f ₃ and f ₄ do not resonate in the first ring resonator, they pass through the first directional coupler 32 and are guided to the first output waveguide 35. I will

Similarly, among the optical signals f ′ _{1 to} f ′ ₄ input from the second input waveguide 31 (fi and f′i have the same optical frequency and different information), f '
_{The second} optical signal is resonated by a second ring resonator including two directional couplers 32 and 34, a ring waveguide 33, and a thin-film heater 37 for adjusting a resonance frequency. 35, f ′ ₁ , f ′ ₃ and f ′ ₄
Is not resonated in the second ring resonator, and is guided to the second output waveguide 36 through the second directional coupler 34.

As described above, the conventional 2 × 2 optical frequency selective switch shown in FIG. 6 uses the ring resonator to transmit the optical signals f ₂ and f ′ ₂ between the _two transmission lines. Can switch.

FIG. 7 is a schematic plan view showing a conventional 2 × 2 optical frequency selection switch using a plurality of ring resonators. 7, the same components as those in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted. Reference numeral 39 in FIG.
Is a first ring resonator, 40 is a second ring resonator, 4
Reference numeral 1 denotes a third ring resonator, and reference numeral 42 denotes a fourth ring resonator.

In the conventional 2 × 2 optical frequency selection switch shown in FIG. 7, the resonance frequency of the second ring resonator 40 is set to f.
₂ , the resonance frequency of the third ring resonator 41 to f ₃ ,
Let the resonance frequency of the first and fourth ring resonators 39 and 42 be f
It is set to anything other than ₁ ~f _4. As described in FIG. 6, the optical frequency f ₂ and f by the second ring resonator 40 'optical signal ₂ are swapped, and the third optical frequency f ₃ by the ring resonator 41 and f' ₃ of the optical signal Will be replaced.

In the conventional 2.times.2 optical frequency selection switch shown in FIG. 7, the resonance frequency of each ring resonator is adjusted by a thin-film heater utilizing a thermo-optic effect, so that light of an arbitrary optical frequency is adjusted. The signal transmission path can be switched.

However, in the conventional optical frequency selection switches using the ring resonators shown in FIGS. 6 and 7, since the thin film heater is used for selecting the optical frequency, the switching speed may be 1 msec or less. It is difficult and cannot be applied to a high-speed and large-capacity optical transmission line.

Further, in the conventional optical frequency selection switch, when increasing the number of optical signals to be optically multiplexed, the number of ring resonators is increased or the resonance frequency interval of the ring resonators is increased according to the number of optical signals. Since the necessity arises, there arises a problem that it is difficult to fabricate a circuit and it is difficult to adjust a resonance frequency of each ring resonator.

Further, since the conventional ring resonator has two inputs and two outputs, there is a problem that it cannot cope with a general K input L output (K, L> 2) which can increase the number of transmission paths to be switched. .

[0017]

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical frequency selection switch capable of selecting an arbitrary plurality of optical signals from a plurality of frequency-multiplexed optical signals and switching the optical path at high speed. It is in.

[0018]

According to a first aspect of the present invention, there is provided an optical frequency selective switch, comprising: a plurality of input waveguides; and a first light receiving port for receiving light from the input waveguide. A slab waveguide, a waveguide array composed of a plurality of waveguides that receive light from the first slab waveguide and that are sequentially elongated by a predetermined waveguide length difference, and a second light that receives light from the waveguide array. Spatial light having an arrayed waveguide grating including a slab waveguide, a plurality of output waveguides receiving light from the second slab waveguide, at least one input waveguide and at least one output waveguide. A spatial light path switching switch array including a plurality of switches, a predetermined output waveguide among the output waveguides of the arrayed waveguide grating, and the input waveguide of the spatial light switch of the spatial light path switching switch array And And a predetermined input waveguide of the input waveguides of the arrayed waveguide grating is optically connected to the output waveguide of the spatial light switch of the spatial light path switch array. It is characterized by having.

According to a second aspect of the present invention, in the optical frequency selective switch according to the first aspect, the input waveguide of the arrayed waveguide grating and the output waveguide of the spatial light path switching switch array do not cross each other. You may.

The invention according to claim 3 is the invention according to claim 1 or 2
In the optical frequency selection switch according to the above, the output waveguide of the arrayed waveguide grating and the input waveguide of the spatial light path switching switch array may avoid intersection.

According to a fourth aspect of the present invention, in the optical frequency selection switch according to the first aspect, each of the spatial light switches of the spatial light path switching switch array is K × L (K ≧ 2,
L ≧ 2, K ≧ L) An optical switch may be used.

According to a fifth aspect of the present invention, in the optical frequency selection switch according to the first aspect, each of the spatial light switches of the spatial light path switching switch array is 1 × K (K ≧ 2).
It may be an optical switch.

According to a sixth aspect of the present invention, in the optical frequency selective switch according to the first aspect, the first slab waveguide and the second slab waveguide of the arrayed waveguide grating are formed by one slab waveguide. A shared configuration may be used.

According to a seventh aspect of the present invention, in the optical frequency selective switch according to the first aspect, the arrayed waveguide grating and the spatial light path changeover switch array are modules independent of each other, and The space optical path changeover switch array may be connected by an optical fiber.

[0025]

According to the first aspect of the present invention, an optical frequency signal capable of selecting an arbitrary optical frequency signal on an optical frequency multiplexed transmission line or switching an arbitrary optical frequency signal between a plurality of transmission lines. A selection switch can be realized.

According to the second aspect of the present invention, since the input waveguide of the arrayed waveguide grating and the output waveguide of the spatial light path changeover switch array avoid intersection, excess loss due to the intersection is reduced. Can be suppressed.

According to the third aspect of the present invention, since the output waveguide of the arrayed waveguide grating and the input waveguide of the spatial light path switch array do not cross each other, excess loss due to the crossing is reduced. Can be suppressed.

According to the fourth aspect of the present invention, each of the spatial light switches of the spatial light path switch array is K × L.
(K ≧ 2, L ≧ 2, K ≧ L) By using an optical switch, it is possible to sufficiently cope with an increase in the number of optical frequency multiplexing or the number of switching transmission lines.

According to the fifth aspect of the present invention, each of the spatial light switches of the spatial light path switch array is 1 × K.
(K ≧ 2) By using an optical switch, an optical signal having an arbitrary optical frequency among optical signals multiplexed by optical frequency on one transmission line can be switched to an arbitrary plurality of transmission lines. In addition, if the input / output relationship is reversed, an optical signal of an arbitrary optical frequency can be switched to a single transmission line among the optical signals multiplexed on a plurality of transmission lines.

According to the sixth aspect of the present invention, the size of the entire circuit can be reduced by combining the two slab waveguides into one.

According to the seventh aspect of the present invention, since the arrayed waveguide grating and the spatial light path changeover switch array are each modularized, an optical frequency selection switch can be easily formed by connecting each module with a fiber. Can be configured.

[0032]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a schematic plan view showing a configuration of an optical frequency selection switch according to a first embodiment of the present invention.

According to the present invention, N input waves are optically frequency multiplexed between K input transmission lines and L output transmission lines (where K, L,
M and N are positive integers, and are N-wave multiplexed K × L optical frequency selection switches for selectively switching optical frequency signals when K ≧ 2, L ≧ 2, and K ≧ L). The embodiment shows a four-wave multiplexing 2 × 2 optical frequency selection switch.

In FIG. 1, 1 is a first input waveguide, and 2 is a second input waveguide.
Is an input waveguide group consisting of M waveguides including the first and second input waveguides 1 and 2 (where M ≧ K · N + L), and 4 is a first slab waveguide. Wave path,
5 is a waveguide array having a waveguide length difference ΔL, 6 is a second slab waveguide, 7 is an M output waveguide group connected from the second slab waveguide 6, and 8 is a split first waveguide. A waveguide group for guiding an optical signal from the input waveguide 1 to a spatial optical switch array described later, and a waveguide group 9 for guiding the split optical signal from the second input waveguide 2 to the spatial optical switch array described later. Group 10, 10 is a spatial optical switch array composed of four 2 × 2 spatial optical switches, 11 is a waveguide group for guiding an optical signal to a first output waveguide described later, and 12 is a second output waveguide described later. A waveguide group for guiding an optical signal to the first output waveguide, 13
4 is a second output waveguide, and 15 is a substrate.

In this embodiment, the number M of waveguides in each of the input waveguide group 3 and the output waveguide group 7 is 10 (=
2.4 + 2). Generally, the N-wave multiplexing K × L of this configuration
Optical frequency selection switch (however, K ≧ 2, L ≧ 2, K ≧
In the case of L), the spatial optical switch array 10 is composed of N K × L spatial optical switches, and the number M of waveguides in the input waveguide group 3 and the output waveguide group 7 is M ≧ K · N +
It is represented by L. When the number of output transmission lines is larger than the number of input transmission lines (K <L), the present invention has reversibility, and there is no problem if the input / output relationship is reversed.

In the present embodiment, a silicon-based substrate was used as the substrate 15, and a quartz optical waveguide was manufactured by a combination of the flame deposition method and the reactive ion etching method. The core size of this waveguide is 6.5 × 6.5 μm ² and the relative refractive index difference Δ is 0.75%. The spatial light switch array 10 is composed of four InP-based waveguide type 2 × 2 semiconductor MQW switches, and is based on a hybrid integration technology (for example,
No. 210018) is connected to the quartz optical waveguide.

Hereinafter, the principle of the present invention will be described based on this embodiment.

The first input waveguide 1 has optical signals f _{1 to} f _4.
However, the optical signals f ′ _{1 to} f ′ ₄ are optically frequency-multiplexed and propagated in the second input waveguide 2. Where fi and f'i
Represents an optical signal having different information at the same optical frequency (transmitted on different transmission paths). Light incident from the first input waveguide 1 enters the first slab waveguide 4 from the # 1 waveguide of the input waveguide group 3, spreads by diffraction, and is arranged perpendicular to the diffracted wavefront. The light is received by the array 5. In the waveguide array 5, since each waveguide is sequentially elongated by the waveguide length difference ΔL, light that propagates through each waveguide and reaches the second slab waveguide 6 corresponds to the waveguide length difference ΔL. A phase difference occurs. Since this phase difference varies depending on the optical frequency, when the light is focused on the input end of the output waveguide group 7 by the lens effect of the second slab waveguide 6, the light is focused on a different waveguide for each optical frequency. . That is, the arrayed waveguide grating including the input waveguide group 3, the first slab waveguide 4, the waveguide array 5, the second slab waveguide 6, and the output waveguide group 7 operates as an optical frequency demultiplexer. .

The light frequency dependence of the light-condensing position shift at the input end of the output waveguide 7 is as follows: the light-condensing position is x, the light frequency is f,
The light wavelength lambda, the lens focal length of the slab waveguide r, the diffraction order m, the effective refractive index n _s of the slab waveguide, the effective refractive index n _c of the waveguide, guiding the slab waveguide connection point Assuming that the waveguide pitch of the waveguide array 5 is d, the center wavelength at which an optical signal input from the center of the input waveguide group 3 is split into the center of the output waveguide group 7 is λ ₀ , and the speed of light in a vacuum is c,

[0041]

(Equation 2)

Can be expressed as follows.

In this embodiment, the optical signals f ₁ -f ₄ from the first input waveguide 1 demultiplexed for each frequency are # M-N + 1 to #M (# 7) of the output waveguide group 7, respectively. To # 10) the arrayed waveguide grating is designed to propagate through the output waveguide. Similarly, the optical signal f ′ from the second input waveguide 2
_{1 to} f ′ ₄ are # 2 to #MN of the output waveguide group 7, respectively.
-1 (# 2 to # 5) were designed to propagate through the output waveguide. The specific design value of the arrayed waveguide grating is f =
9.38 mm, d = 25 μm, M = 118, ΔL = 12
6.27 μm, the number of first waveguide arrays 3 is 100
Here, the waveguide pitch of the second waveguide array 5 at the connection point of the second fan-shaped slab waveguide is set to 25 μm, and the optical frequency interval is set to 100 GHz.

Of the optical signals demultiplexed for each optical frequency, the optical signals f _{1 to} f ₄ from the input waveguide 1 pass through the waveguide group 8 and the optical signals f ′ _{1 to} f ′ from the input waveguide 2. ₄ propagates through the waveguide group 9 and is guided to the spatial optical switch array 10 including four 2 × 2 spatial optical switches. Waveguide group 8 and 9, f ₁ and f in # 1 switch in space optical switch array 10 so that the optical signal is switched corresponding to that _{2 '1,} f ₂ and f in # 2 switch' cross each other ing. The figure shows a case where the switches # 1 and # 4 are in the through state, and the switches # 2 and # 3 are in the cross state.

After passing through the spatial light switch array 10, the optical signals f ₁ , f ′ ₂ , f ′ ₃ and f ₄ are transmitted to the waveguide group 11.
And the optical signals f ′ ₁ , f ₂ , f ₃ and f ′ ₄ propagate through the waveguide group 12 respectively. The waveguide group 11 is connected to the # M-N + 1 to #M (# 7 to # 10) waveguides of the input waveguide group 3, and the waveguide group 12 is connected to # 2 to # 2 of the input waveguide group 3.
# M-N-1 (# 2 to # 5) waveguides. The optical signals f ₁ , f ′ ₂ , f ′ ₃ and f ₄ from the waveguide group 11 are multiplexed and guided to the first output waveguide 13 due to the symmetry of the multiplexer / demultiplexer characteristics of the arrayed waveguide grating. I will Similarly, the optical signals f ′ ₁ , f ₂ , f ₃ and f ′ from the group of waveguides 12
₄ are multiplexed, guided to the second output waveguide 14, and output. Thus, the optical frequency selection switch of the embodiment, the optical signals f ₂ and f so that the transmission path of _'2, optical signals f ₃ and f' ₃ is switched.

As described above, in this embodiment, by operating each of the spatial optical switches of the spatial optical switch array 10, a transmission path between arbitrary optical signals having the same optical frequency propagating through a plurality of transmission paths is transmitted. It is possible to switch. The switching speed is determined only by the speed of the spatial light switch, and in this embodiment, the semiconductor M is used as the spatial light switch.
Since a QW switch is used, high-speed switching of 1 nsec or less is possible.

Furthermore, even if the number of optical frequency multiplexing and the number of switching transmission lines increase, the design of the array waveguide grating and the number of inputs and outputs of the spatial optical switch array need only be changed, and the number of array waveguide gratings increases. No need. This is very advantageous in making a large-scale optical frequency selection switch.

(Embodiment 2) FIG. 2 is a schematic plan view showing the configuration of an optical frequency selection switch according to a second embodiment of the present invention. Also in this embodiment, four-wave multiplexing 2
× 2 optical frequency selection switch (generally, N-wave multiplexing K ×
L optical frequency selection switch). 2 that are the same as those of the embodiment shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 2, reference numeral 3 denotes an input waveguide group consisting of M waveguides connected to the first slab waveguide 4 (where M ≧
N · (K + L−1) +1), and the number M of waveguides in the input waveguide group 3 ′ and the output waveguide group 7 is 13 (= 4 · (2 + 2-1) +1).

The present embodiment is a four-wave multiplexed 2 × 2 optical frequency selection switch that performs the same operation as that of the first embodiment.
The second input waveguide 2 and the second output waveguide 14 are different from each other in that they do not intersect the waveguide group 9 and the waveguide group 12, respectively, and it is possible to suppress excess loss due to the intersection. Generally, in the case of the N-wave multiplexed K × L optical frequency selection switch (where K ≧ 2, L ≧ 2, K ≧ L) of the present configuration, the spatial optical switch array 10 is composed of N K × L spatial optical switches. And the number M of waveguides of the input waveguide group 3 and the output waveguide group 7
Is M ≧ N · (K + L−1) +1, which is larger than in the first embodiment.

(Embodiment 3) FIG. 3 is a schematic plan view showing the configuration of an optical frequency selection switch according to a third embodiment of the present invention. In this embodiment, unlike the first and second embodiments, a four-wave multiplex 1 × 2 optical frequency selection switch (generally, an N-wave multiplex 1
× K optical frequency selection switch).
In the configuration of the present embodiment shown in FIG. 3, the components common to the configurations of the embodiments shown in FIGS. 1 and 2 are denoted by the same reference numerals, and the description thereof is omitted.

In FIG. 3, reference numeral 3 denotes an input waveguide group consisting of M waveguides connected to the first slab waveguide 4 (where M ≧
N · K + 1), and the input waveguide group 3 and the output waveguide group 7
Are 9 (= 4.2 + 1). Generally, in the case of an N-wave multiplexed 1 × K optical frequency selection switch, the number M of waveguides of the input waveguide group 3 and the output waveguide group 7 needs to be M ≧ NK · K + 1, and the spatial optical switch array 16 has N pieces. It is composed of a 1 × K space optical switch.

The basic operation principle of this embodiment is the same as that of the first embodiment.
As described above, of the optical signals multiplexed on one transmission line, the optical signal of an arbitrary optical frequency can be switched to an arbitrary plurality of transmission lines. In this case, since the number of waveguides is limited to 1 input and K output, the number M of waveguides in the input waveguide group 3 and the output waveguide group 7 is M ≧ NK + 1. Is a feature. It is needless to say that if the input / output relationship is used in reverse, it can be operated as an optical frequency selection switch with K inputs and 1 output.

(Embodiment 4) FIG. 4 is a schematic plan view showing the configuration of an optical frequency selection switch according to a fourth embodiment of the present invention. In the present embodiment, as in the first and second embodiments, a four-wave multiplexing 2 × 2 optical frequency selection switch (generally, an N-wave multiplexing K × L optical frequency selection switch) is shown. In the configuration of the present embodiment shown in FIG. 4, the components common to the configurations of the embodiments shown in FIGS.
The description is omitted.

In FIG. 4, reference numeral 3 denotes an input waveguide group consisting of M waveguides connected to the slab waveguide 17 (where M ≧ K ·
N + L).

The operation principle of this embodiment is the same as that of the first embodiment, except that the first slab waveguide 4 and the second slab waveguide 6 in the first embodiment are replaced by one slab waveguide 17. This is advantageous in that the size of the entire circuit can be reduced. It is needless to say that the configuration method in which a plurality of slab waveguides are replaced with one slab waveguide as in the present embodiment can be applied to the second and third embodiments.

(Embodiment 5) FIG. 5 is a schematic plan view showing the structure of an optical frequency selection switch according to a fifth embodiment of the present invention. In this embodiment, as in the first, second, and fourth embodiments, 4
A wave multiplexing 2 × 2 optical frequency selection switch (generally, an N-wave multiplexing K × L optical frequency selection switch) is shown. FIG.
In the configuration of the present embodiment shown in FIG. 7, the same reference numerals are given to components common to the configurations of the embodiments shown in FIGS. 1 to 4, and the description thereof will be omitted.

In FIG. 5, reference numeral 18 denotes a first input fiber, 1
9 is a second input fiber, 20 is an input fiber group consisting of M fibers connected to the input waveguide group (where M ≧
K · N + L), 21 is an output fiber group composed of M fibers connected from the output waveguide group 7, 22 is a fiber group that guides the optical signal from the first input fiber 18, and 23 is the branched optical fiber. A group of fibers for guiding an optical signal from the second input fiber 19, a spatial light switch array module 24 including four 2 × 2 spatial optical switches, and a guide 25 for guiding an optical signal to a first output fiber described later. A fiber group, 26 is a fiber group for guiding an optical signal to a second output fiber described later, 27 is a first output fiber, 28 is a second output fiber, and 29 is an arrayed waveguide grating module. In this embodiment, the number M of the input fiber group 20 and the number M of the output fiber group 21 is 10 (= 2.4 + 2), respectively.
It is.

The operation principle of the present embodiment is the same as that of the first embodiment, except that the arrayed waveguide grating and the spatial light switch are manufactured as independent modules, respectively, and connected by using fibers. Although the overall size is large, there is an advantage that the optical frequency selection switch can be easily configured by connecting the individual modules with fibers.

The method of preparing the arrayed waveguide grating and the spatial light switch as independent modules as in the present embodiment and connecting the modules with fibers can be applied to the second to fourth embodiments. Not even.

As described above, the present invention has been specifically described based on the embodiments. However, the present invention is not limited to the configuration of the above embodiments, and it is needless to say that various changes can be made without departing from the gist of the present invention. Nor. For example, the waveguide and the spatial light switch are not limited to the material system in the embodiment, and the present invention can be realized with other material systems as long as they have the same function.

For example, the waveguide may be an organic material waveguide represented by a polymer waveguide or a semiconductor waveguide such as an InP waveguide. The spatial light switch is Li
There is no problem with other high-speed spatial optical switches such as a combination of an NbO ₃ -based waveguide switch or a Y-branch circuit and a semiconductor gate switch, and the thermo-optic effect (TO) is used when the switching speed is allowed to be 1 msec or more. The present invention can also be realized by using a quartz-based waveguide type TO switch described above, the ring resonator shown in the conventional example, or the like.

Further, in the embodiment, the waveguide and the spatial light switch are connected by the hybrid integrated technology in the embodiment.
Although an example is shown in which independent modules are connected by fibers, there is no problem if they are manufactured on the same substrate using the same material by monolithic integration technology.

[0064]

As described above, according to the present invention,
An optical frequency selection switch for selecting an arbitrary optical frequency signal of an optical frequency multiplexed transmission line or switching an arbitrary plurality of optical frequency signals between a plurality of transmission lines can be realized.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a first embodiment of an optical frequency selection switch according to the present invention.

FIG. 2 is a schematic plan view showing a second embodiment of the optical frequency selection switch according to the present invention.

FIG. 3 is a schematic explanatory view showing a third embodiment of the optical frequency selection switch of the present invention.

FIG. 4 is a schematic plan view showing a fourth embodiment of the optical frequency selection switch according to the present invention.

FIG. 5 is a schematic plan view showing a fifth embodiment of the optical frequency selection switch according to the present invention.

FIG. 6 is a schematic plan view showing a conventional optical frequency selection switch using a ring resonator.

FIG. 7 is a schematic plan view showing a conventional optical frequency selection switch using a plurality of ring resonators.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 first input waveguide 2 second input waveguide 3 input waveguide group 4 first slab waveguide 5 waveguide array 6 second slab waveguide 7 output waveguide group 8 waveguide group 9 waveguide Group 10 spatial optical switch array 11 waveguide group 12 waveguide group 13 first output waveguide 14 second output waveguide 15 substrate 16 spatial optical switch array 17 slab waveguide 18 first input fiber 19 second input Fiber 20 Input fiber group 21 Output fiber group 22 Fiber group 23 Fiber group 24 Spatial optical switch array module 25 Fiber group 26 Fiber group 27 First output fiber 28 Second output fiber 29 Array waveguide grating module 30 First input Waveguide 31 second input waveguide 32 first directional coupler 33 ring waveguide 34 second directional coupler 5 First output waveguide 36 Second output waveguide 37 Thin film heater for adjusting resonance frequency using thermo-optic effect 38 Substrate 39 First ring resonator 40 Second ring resonator 41 Third ring resonator 42 Fourth ring resonator

──────────────────────────────────────────────────続 き Continuing on the front page (72) Koji Sasayama, Inventor Nippon Telegraph and Telephone Corporation, 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo (58) Field surveyed (Int. Cl. ⁷ , DB name) 00-1/035 G02F 1/29-1/313 G02B 6/12-6/14 G02B 6/28 G02B 6/34 H04J 14/00-14/02 H04Q 3/52

Claims (7)

(57) [Claims] 1. A plurality of input waveguides, a first slab waveguide receiving light from the input waveguide, and a light receiving from the first slab waveguide and a predetermined waveguide length difference sequentially increases. An array waveguide grating including a waveguide array including a plurality of waveguides, a second slab waveguide receiving light from the waveguide array, and a plurality of output waveguides receiving light from the second slab waveguide. And a spatial light path switch array including a plurality of spatial light switches each having at least one input waveguide and at least one output waveguide, wherein a predetermined one of the output waveguides of the arrayed waveguide grating is provided. And the input waveguide of the spatial light switch of the spatial light path switching switch array is optically connected, and a predetermined input waveguide of the input waveguides of the arrayed waveguide grating. And said An optical frequency selection switch, wherein the output waveguide of the spatial light switch of the spatial light path switching switch array is optically connected. 2. An optical frequency selective switch according to claim 1, wherein said input waveguide of said arrayed waveguide grating and said output waveguide of said spatial light path switching switch array do not cross each other. Optical frequency selection switch. 3. The optical frequency selective switch according to claim 1, wherein said output waveguide of said arrayed waveguide grating and said input waveguide of said spatial light path switching switch array avoid intersection. Characteristic optical frequency selection switch. 4. The optical frequency selection switch according to claim 1, wherein each of the spatial light switches of the spatial light path switch array is a K × L (K ≧ 2, L ≧ 2, K ≧ L) optical switch. An optical frequency selection switch, characterized in that: 5. The optical frequency selection switch according to claim 1, wherein each of said spatial optical switches of said spatial optical path switching switch array is a 1 × K (K ≧ 2) optical switch. switch. 6. The optical frequency selective switch according to claim 1, wherein the first slab waveguide and the second slab waveguide of the arrayed waveguide grating are shared by one slab waveguide. An optical frequency selection switch characterized in that: 7. The optical frequency selection switch according to claim 1, wherein the arrayed waveguide grating and the spatial light path switching switch array are independent modules, and the arrayed waveguide grating and the spatial light path switching switch array are separated from each other. An optical frequency selection switch characterized by being connected by an optical fiber.