JPS6410143B2 - - Google Patents
Info
- Publication number
- JPS6410143B2 JPS6410143B2 JP57001639A JP163982A JPS6410143B2 JP S6410143 B2 JPS6410143 B2 JP S6410143B2 JP 57001639 A JP57001639 A JP 57001639A JP 163982 A JP163982 A JP 163982A JP S6410143 B2 JPS6410143 B2 JP S6410143B2
- Authority
- JP
- Japan
- Prior art keywords
- optical
- signal
- wavelength
- photodetectors
- amplified signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000003287 optical effect Effects 0.000 claims description 33
- 238000001514 detection method Methods 0.000 claims description 17
- 230000003321 amplification Effects 0.000 claims description 12
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 12
- 239000013307 optical fiber Substances 0.000 description 6
- 238000005086 pumping Methods 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Description
【発明の詳細な説明】
本発明は光信号を高速かつ高感度に検出でき
る。光信号検出装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention can detect optical signals at high speed and with high sensitivity. The present invention relates to an optical signal detection device.
従来、微弱な高速パルス光信号の検出装置とし
ては、フオトダイオードもしくはアバランシエ・
フオトダイオードを検出素子とした装置が使用さ
れていた。中でも高速・微弱信号の受信が必要な
光フアイバ通信装置では、アバランシエ・フオト
ダイオードが多く利用されて来ていた。アバラン
シエ・フオトダイオードは内部増幅作用を有し、
高感度な光信号検出が可能であるが、その内部増
幅度は高々数十倍程度であり、微弱信号の検出に
は低雑音の電気的増幅器との併用が必要であつ
た。このため感度の改善に限界が見られた。一
方、フオトダイオードは比較的高速の光信号検出
が可能であるが、検出感度が低いために用途が限
定されるという欠点があつた。 Conventionally, photodiodes or avalanche detectors have been used to detect weak high-speed pulsed optical signals.
A device using a photodiode as a detection element was used. In particular, avalanche photodiodes have been widely used in optical fiber communication equipment that requires the reception of high-speed, weak signals. The avalanche photodiode has an internal amplification effect,
Highly sensitive optical signal detection is possible, but the internal amplification is only several tens of times at most, and detection of weak signals requires combined use with a low-noise electrical amplifier. For this reason, there was a limit to the improvement in sensitivity. On the other hand, although photodiodes are capable of relatively high-speed optical signal detection, they have the disadvantage that their applications are limited due to their low detection sensitivity.
本発明の目的は、上述の欠点を除去した光信号
検出装置を提供することにある。 An object of the present invention is to provide an optical signal detection device that eliminates the above-mentioned drawbacks.
本発明によれば、入力される光信号及び励起光
源からの励起光を合波する光合波器とその光合波
器に接続された誘導散乱増幅媒体とその誘導散乱
増幅媒体に接続された光分波器とその光分波器か
ら出力される増幅信号成分及び波長変換増幅信号
成分に対する信号処理部とを有することを特徴と
する光信号検出装置が得られる。 According to the present invention, there is provided an optical multiplexer that multiplexes an input optical signal and pump light from a pump light source, a stimulated scattering amplification medium connected to the optical multiplexer, and an optical multiplexer connected to the stimulated scattering amplification medium. An optical signal detection device is obtained, which includes a wave splitter and a signal processing unit for the amplified signal component and the wavelength-converted amplified signal component output from the optical demultiplexer.
次に図面を参照して本発明を詳細に説明する。
第１図は本発明の一実施例を表わす図である。本
実施例は、励起光源としての1.32μｍYAGレーザ
１、1.32μｍの光に対する誘電体多層反射膜を内
部に含む光合波器３、誘導散乱増幅媒体としての
1.3μｍ帯零分散単一モード光フアイバ５、回折格
子光分波器６、Geフオトダイオードを検出素子
とする光検出部７，８、相関検出部９、及び結合
光学系２，４によつて構成されている。 Next, the present invention will be explained in detail with reference to the drawings.
FIG. 1 is a diagram showing one embodiment of the present invention. This example uses a 1.32 μm YAG laser 1 as an excitation light source, an optical multiplexer 3 containing a dielectric multilayer reflective film for 1.32 μm light, and a stimulated scattering amplification medium.
By a 1.3 μm band zero-dispersion single mode optical fiber 5, a diffraction grating optical demultiplexer 6, photodetectors 7 and 8 using Ge photodiodes as detection elements, a correlation detection unit 9, and coupling optical systems 2 and 4. It is configured.
さて、光フアイバ５の1.32μｍ光に対する誘導
散乱帯域1.36〜1.40μｍ内の光である波長1.38μｍ
の光信号を結合光学系４を通して導入し、光合波
器３でYAGレーザ１の光と合波し、光フアイバ
５を導波させる。光信号成分は、光フアイバ５の
誘導散乱増幅作用を受せて増幅されると同時に、
増幅信号光と励起光との光混合により、増幅信号
光とほぼ同程度の強度をもち励起光よりも短波長
の波長変換増幅信号成分を出じる。励起光の周波
数をνp、信号光の周波数νs、波長変換増幅信号光
の周波数をνcとするとνc＝νp−（νs−νp）なる関
係がある。増幅信号成分と、波長変換増幅信号成
分及び透過した励起光成分は回折格子光分波器６
によつて分波され、両信号成分はそれぞれ光検出
部７及び８で検出される。両信号成分は入力信号
に応じた変化を有するため、光検出部７，８の両
出力信号の相関を検出することにより、光検出部
７，８で生じた非相関雑音成分比を低減し高感度
な信号検出を可能とする。誘導散乱増幅を利用し
た本実施例は増幅がすべて光領域、即ち光子間相
互作用によつているため、極めて高速、例えば
10Gb／ｓ領域のパルス信号増幅も可能であり、
また電子素子では実現困難な増幅度104〜105が比
較的容易に得られる。なお、光検出部７，８は信
号が有するスペクトル全体の強度を検出するよう
にしても良いが、増幅信号成分及び波長変換増幅
信号成分のスペクトル形状も合わせて検出し、両
者が励起光スペクトル位置を中心に対称形状を有
することを考慮した相関検出処理を行なう方が、
より効果的に背影雑音成分を低減でき高感度な信
号検出が可能となる。 Now, the wavelength of 1.38 μm is light within the stimulated scattering band of 1.36 to 1.40 μm for the 1.32 μm light of the optical fiber 5.
The optical signal is introduced through a coupling optical system 4, is combined with the light from the YAG laser 1 by an optical multiplexer 3, and is guided through an optical fiber 5. The optical signal component is amplified by the stimulated scattering amplification effect of the optical fiber 5, and at the same time,
By optically mixing the amplified signal light and the pumping light, a wavelength-converted amplified signal component having approximately the same intensity as the amplified signal light and a shorter wavelength than the pumping light is produced. When the frequency of the pumping light is νp, the frequency of the signal light is νs, and the frequency of the wavelength-converted and amplified signal light is νc, there is a relationship of νc=νp−(νs−νp). The amplified signal component, the wavelength-converted amplified signal component, and the transmitted pumping light component are processed by a diffraction grating optical demultiplexer 6.
Both signal components are detected by photodetectors 7 and 8, respectively. Since both signal components change according to the input signal, by detecting the correlation between both output signals of the photodetectors 7 and 8, the uncorrelated noise component ratio generated in the photodetectors 7 and 8 can be reduced and increased. Enables sensitive signal detection. In this example, which uses stimulated scattering amplification, the amplification is entirely in the optical domain, that is, due to interaction between photons, so it is extremely fast, e.g.
Pulse signal amplification in the 10Gb/s region is also possible,
Furthermore, an amplification degree of 10 4 to 10 5 , which is difficult to achieve with electronic devices, can be obtained relatively easily. Note that the photodetectors 7 and 8 may detect the intensity of the entire spectrum of the signal, but also detect the spectral shapes of the amplified signal component and the wavelength-converted amplified signal component, so that both of them are located at the pumping light spectral position. It is better to perform correlation detection processing that takes into account that the shape is symmetrical around
Background noise components can be reduced more effectively and highly sensitive signal detection becomes possible.
ところで、上述の実施例では励起光源をYAG
レーザとしたが、もちろん本発明はこれに限定す
るものではなく、信号光の波長に応じて適当に選
択することができ、例えばArイオンレーザ等を
利用しても良い。また、光信号も上述の実施例の
ように必ずしも単一波長に限定せず、複数の波長
を用いた互いに独立な複数の光信号の合成であつ
ても良い。 By the way, in the above embodiment, the excitation light source is YAG.
Although a laser is used, the present invention is of course not limited to this, and can be appropriately selected depending on the wavelength of the signal light. For example, an Ar ion laser or the like may be used. Further, the optical signal is not necessarily limited to a single wavelength as in the above embodiments, but may be a combination of a plurality of mutually independent optical signals using a plurality of wavelengths.
最後に本発明の特徴を要約すれば、高感度かつ
高速応答可能な低雑音光信号検出装置が得られる
ことである。 Finally, to summarize the features of the present invention, it is possible to obtain a low-noise optical signal detection device capable of high sensitivity and high-speed response.
第１図は本発明にもとづく一実施例の構成図で
ある。
図中、１……YAGレーザ、２及び４……結合
光学系、３……光合波器、５……光フアイバ、６
……回折格子光分波器、７及び８……光検出部、
９……相関検出部である。
FIG. 1 is a block diagram of an embodiment based on the present invention. In the figure, 1... YAG laser, 2 and 4... Coupling optical system, 3... Optical multiplexer, 5... Optical fiber, 6
...Diffraction grating optical demultiplexer, 7 and 8...Photodetection section,
9...correlation detection section.
Claims (1)
を合波する光合波器と、その光合波器に接続され
た誘導散乱増幅媒体と、その誘導散乱増幅媒体の
出力部に接続された光分波器と、その光分波器か
ら出力される増幅信号成分及び波長変換増幅信号
成分をそれぞれ受信する二台の光検出部と、その
光検出部から得られる二つの出力信号を入力信号
とする相関検出部とを有することを特徴とする光
信号検出装置。1. An optical multiplexer that combines an input optical signal and pump light from a pump light source, a stimulated scattering amplification medium connected to the optical multiplexer, and an optical demultiplexer connected to the output part of the stimulated scattering amplification medium. A wavelength converter, two photodetectors each receiving an amplified signal component and a wavelength-converted amplified signal component output from the optical demultiplexer, and two output signals obtained from the photodetectors as input signals. 1. An optical signal detection device comprising: a correlation detection section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57001639A JPS58119241A (en) | 1982-01-08 | 1982-01-08 | Optical signal detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57001639A JPS58119241A (en) | 1982-01-08 | 1982-01-08 | Optical signal detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58119241A JPS58119241A (en) | 1983-07-15 |
| JPS6410143B2 true JPS6410143B2 (en) | 1989-02-21 |
Family
ID=11507090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57001639A Granted JPS58119241A (en) | 1982-01-08 | 1982-01-08 | Optical signal detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58119241A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3137632B2 (en) * | 1989-08-31 | 2001-02-26 | 富士通株式会社 | Optical communication system with optical fiber amplifier |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6022638Y2 (en) * | 1980-03-11 | 1985-07-05 | 日本電気株式会社 | High power optical pulse generator |
-
1982
- 1982-01-08 JP JP57001639A patent/JPS58119241A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58119241A (en) | 1983-07-15 |
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