JPS60428A - Demodulating system of superhigh-speed optical phase modulated wave - Google Patents
Demodulating system of superhigh-speed optical phase modulated waveInfo
- Publication number
- JPS60428A JPS60428A JP58108811A JP10881183A JPS60428A JP S60428 A JPS60428 A JP S60428A JP 58108811 A JP58108811 A JP 58108811A JP 10881183 A JP10881183 A JP 10881183A JP S60428 A JPS60428 A JP S60428A
- Authority
- JP
- Japan
- Prior art keywords
- optical phase
- signal
- wave
- speed optical
- superhigh
- 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.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 41
- 239000013307 optical fiber Substances 0.000 abstract description 11
- 238000001228 spectrum Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000010287 polarization Effects 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000011084 recovery 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)
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
【発明の詳細な説明】
（ａ） 発明の技術分野
本発明は単一偏波保存単一モード光ファイバにて伝送さ
れた、Ｎ種類の位相変調されたスペクトル波形のＩ光波
飢す波で位相変調した超高速度光位相変調波信号を最高
のＳ／Ｎで復調可能な超高速度光位相変調波復調方式に
関する。DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to phase modulation of I-waves of N types of phase-modulated spectral waveforms transmitted in a single-polarization-maintaining single-mode optical fiber. The present invention relates to an ultra-high speed optical phase modulation wave demodulation method capable of demodulating a modulated ultra high speed optical phase modulation wave signal with the highest S/N.
（ｂ） 従来技術と問題点
超高速度光位相変調波復調方式は従来超々高安定化光源
を用いる光周波数局発方式が考えられていたが、送受信
回路の光周波数偏差を十分に合致さすことが出来ず又光
位相雑音元コアイバ内発生光位相雑音を十分に除去出来
ず復調後のＳ／Ｎを充分大きく出来ないため実用化され
ていない。又光の自己相関をとる遅延検波復調方式も考
へられているが、この方式は位相再生が複雑であシ、か
つ超高速度光位相変調波の復調は望めず実用化されてい
ない。(b) Conventional technology and problems The ultra-high speed optical phase modulation wave demodulation method was conventionally considered to be an optical frequency local oscillation method using an ultra-high stabilized light source, but it is necessary to sufficiently match the optical frequency deviation of the transmitting and receiving circuits. It has not been put to practical use because it cannot sufficiently remove optical phase noise generated within the core fiber, which is the source of optical phase noise, and cannot sufficiently increase the S/N after demodulation. A delayed detection demodulation method that takes the autocorrelation of light has also been considered, but this method requires complicated phase recovery and cannot be expected to demodulate ultra-high-speed optical phase modulated waves, so it has not been put to practical use.
（ｃ）発明の目的
本発明の目的は上記の状態に鑑み、単一偏波保存単一モ
ード光ファイバにて伝送された、Ｎ種類の位相変調され
たスペクトル波形の超高速度光位相変調波信号を最高の
Ｓ／Ｎで復調可能な超高速度光位相変調波復調方式の提
供にある○（ｄ） 発明の構成
本発明は上記の目的全達成するために、Ｎ１’ｌ＋顛の
位相変調されたスペクトル波形の超高速度光位相変調波
信号ｓ、（ω）・ε−ｊＯＪｔＳＮ（（社）・ε−ｊＯ
ノｔ（但しｔｌ−を時間、０Ｊ−２πｆ、ｆｔｄ超高速
度光位相変調波信号の周波数）を復調する場合、位相変
調されたスペクトル波形の種類の数Ｎに応じて、該超高
速度光位相変調信号の波面又は振巾全Ｎ等分し、夫々れ
を受信光波伝達関数ｙ＋（ω１−ＹＮ（（ロ）を超高速
ＹＮ（ω）−８Ｎ（”）”・ε−Ｃｔｏ（但しｔ。は光
波が入力して立上る迄の遅延時間）に夫々れ調整された
８個の光位相整合用空間フィルタに入力し夫々れ復調波
成分
’ｌ＋ （ｔ）−ｆ Ｓ＋ （ω）Ｙ、（ω）ε−ｊ（
′（ｔ−ｔｏ）ｄｆｙＮ（ｔ）＝ ｆ ５Ｎ（（ロ）Ｙ
Ｎ（→ε−ｊ０）（ｔ−ｔｏ）ｄｆを発生させこれ全天
々れの光検知器に入力し、電気信号に変換された復調信
号を取出すようにしたことを特徴とし、所謂ｍａｔｃｈ
Ｆｉｌｔｅｒの理論によυ直接光相関を取ることで、
最高のＳ／Ｎが得られる超高速度光位相変調波の復調を
可能にしている０（ｅ） 発明の実施例
以下本発明の実施例につき図に従って説明する。(c) Object of the Invention In view of the above-mentioned situation, the object of the present invention is to transmit an ultra-high speed optical phase modulated wave of N types of phase modulated spectral waveforms transmitted through a single polarization maintaining single mode optical fiber. The purpose of the present invention is to provide an ultra-high speed optical phase modulation wave demodulation system that can demodulate signals with the highest S/N. The ultra-high speed optical phase modulation wave signal s, (ω)・ε-jOJtSN (Company)・ε-jO
When demodulating t (where tl- is time, 0J-2πf, the frequency of the ftd ultra-high-speed optical phase modulated wave signal), the ultra-high-speed optical The wavefront or amplitude of the phase modulation signal is divided into N equal parts, and each is divided into received light wave transfer functions y+(ω1-YN((b)) as ultra-high speed YN(ω)-8N('')''・ε-Cto(however, t . is the delay time from when a light wave is input until it rises), and the demodulated wave components 'l+ (t)-f S+ (ω)Y, (ω)ε−j(
'(t-to)dfyN(t)= f 5N((b)Y
It is characterized by generating N(→ε-j0)(t-to)df, inputting it to a photodetector on all sides of the sky, and extracting a demodulated signal converted into an electrical signal, which is called a match.
By taking υ direct optical correlation according to Filter's theory,
Embodiments of the Invention Examples of the invention will now be described with reference to the drawings.
第１図は本発明の実施例の３個に振巾分割した場合の復
調回路のブロック図、第２図は本発明の実施例の２個に
波面分割した場合の復調回路のブロック図である。FIG. 1 is a block diagram of a demodulation circuit when the amplitude is divided into three parts according to an embodiment of the present invention, and FIG. 2 is a block diagram of a demodulation circuit when the wave front is divided into two parts according to an embodiment of the present invention. .
図中１〜４，３〜７，１４は単一偏波保存・単一モード
光ファイバ（以下光ファイバと称す）、８、 ９． １
０． １６． １７は光位相整合用空間フィルタで８．
９．１０は光ファイバで構成されており、１６．１７は
誘電体ミラーで構成されている場合を示している。１１
〜１３，１８．１９は光検知器を示す。In the figure, 1 to 4, 3 to 7, and 14 are single polarization maintaining/single mode optical fibers (hereinafter referred to as optical fibers), 8, 9. 1
0. 16. 17 is a spatial filter for optical phase matching; 8.
9.10 is composed of optical fibers, and 16.17 is composed of dielectric mirrors. 11
~13,18.19 indicate photodetectors.
第１図において光ファイバ１より送られてきた３種類の
位相変調されたスペクトル波形の超高速度光位相変調波
信号Ｓ＋（ω）・ε−ｊａ＋ｔ・・Ｓ、（→・ε−％７
１（但し、ω＝２πｆ、ｆは超高速度光位相変調波信号
の周波数、ｔは時間）Ｆｉイ点にて波面を３等分され光
ファイバ２〜４を介し、光位相整合用空間フィルタ８〜
１０に入力する。光位相整合用空間フィルタ８〜１０の
受信光伝達関数Ｙ、（ω）〜Ｙ３（ω）は、ε−ｊＧＪ
ｔｏ〜Ｙ３（ω）＝Ｓ３（→札ε−ｊ（Ｊ）ｔｏ（但し
ｔｏは光波が入力して立上る迄の遅延時間）に調整され
ておるので、光位相整合用空間フィルタ８〜１０で夫々
れｍａｔｃｈ Ｆｉｌｔｅｒ理論により復調信号成分３
’＋（ｔ）−、ｒ： ｓ＋（ω）ｙ＋（ｏｃ ”’（ｔ
−ｔｏ）ａｆ〜ｙｓ（ｔ）−Ｊ ： ８３（ωｉＹ ｓ
（’ジε−ｊｒａ（ｔ ｔｏ） ｄｆ を発生する。In Fig. 1, ultra-high speed optical phase modulated wave signals S+(ω)・ε−ja+t・・S, (→・ε−%7
1 (where ω = 2πf, f is the frequency of the ultra-high speed optical phase modulation wave signal, and t is time) The wavefront is divided into three equal parts at point Fi, and the optical phase matching spatial filter is passed through optical fibers 2 to 4. 8～
Enter 10. The reception optical transfer functions Y, (ω) to Y3(ω) of the spatial filters 8 to 10 for optical phase matching are ε−jGJ
Since it is adjusted to ~ Y3 (ω) = S3 (→ tag ε-j (J) to (where to is the delay time from when the light wave is input until it rises), the optical phase matching spatial filters 8 to 10 According to the match filter theory, demodulated signal component 3
'+(t)-, r: s+(ω)y+(oc "'(t
-to)af~ys(t)-J: 83(ωiYs
('diε-jra(t to) df is generated.
この領調信号成分は光ファイバ５〜７を介し光検知器１
１〜１３に送られ電気信号に変換された復調信号が得ら
れる。ここで電界： ＩＥ ｉ−ｊ： 、’ ＩＥ−ｆ
”ｌｓ＋（（ロ）１２ｄｆ で表はされるので復調信号
成分ｙ＋ （ｔ）＝ ２ （ＩＥ となる。このことは
光成分は殆んど電気成分となることであシ、この場合の
雑音型９Ｓ／Ｎは最大値となる。これはｙ２（ｔＬ ｙ
３（ｔ）についても同様である。This signal component is transmitted to the photodetector 1 via optical fibers 5 to 7.
1 to 13, and a demodulated signal is obtained which is converted into an electrical signal. Here the electric field: IE i-j: ,' IE-f
Since it is expressed as "ls+((b)12df", the demodulated signal component y+(t)=2(IE).This means that the optical component becomes almost an electrical component, and in this case, the noise type 9S/N becomes the maximum value. This is y2(tL y
The same applies to 3(t).
次に第２図において、光ファイバ１４よｐ送られてきた
２種類の位相変調されたスペクトル波形の超高速度光位
相変調波信号Ｓ、（ω）・ε−””＋８２（ω）・ε−
ｊｗｊ（但しω＝２πｆ、ｆは超高速度光位相変調波信
号の周波数、ｔは時間）はレンズ１５にて平行光になり
光位相整合用空間フィルタ１．６．１７にて波面を２等
分され光位相整合用空間フィルタ１６．１７に入力する
。光位相整合用空間フィルタ１６．１７は夫々れ受信光
波伝達関数ｙ ＋ （０１） 。Next, in FIG. 2, an ultra-high speed optical phase modulated wave signal S of two types of phase modulated spectrum waveforms is sent from the optical fiber 14, (ω)・ε−””+82(ω)・ε −
jwj (where ω = 2πf, f is the frequency of the ultra-high speed optical phase modulation wave signal, and t is time) is turned into parallel light by the lens 15, and the wavefront is divided into two magnifications by the optical phase matching spatial filter 1.6.17. The signals are separated and input to spatial filters 16 and 17 for optical phase matching. The spatial filters 16 and 17 for optical phase matching each have a receiving light wave transfer function y + (01).
・ε−””０＋ Ｙ２（’）＝ Ｓ ２ （”）＊・ε
−ｊ”ｔｏ （但しｔｏハ光波が入力して立上る迄の遅
延時間）に夫々れ調整されておるので、光位相整合用空
１０Ｊフィルタ１６゜１７にて夫々れｍａｔｃｈ Ｆｉ
ｄｔｅｒ理論により復調信号成分
Ｍｌ（ｔ）−ｒ″′Ｓ、（ωｉｙ＋（０→ε−ｊｏ＞（
ｔ−ｔｏ）ｄｆｙ２（ｔ）＝ｆ”５２（ｔｏ）Ｙ２（ω
）ｅ −ｊｏＩ” ” ’ ｄｆ ｋＢ生ｆる。この復
調信号成分に光検知器１８．１９に送られ電気信号に変
換された復調信号が得られる。・ε−””0+ Y2(')=S2('')*・ε
- j"to (however, to is the delay time from when the light wave is input until it rises), so the match Fi
According to the dter theory, the demodulated signal component Ml(t)−r″′S, (ωiy+(0→ε−jo>(
t-to)dfy2(t)=f”52(to)Y2(ω
) e -joI""' df kB is generated. This demodulated signal component is sent to photodetectors 18 and 19 to obtain a demodulated signal that is converted into an electrical signal.
ここで電界 ＩＥは°ＩＥ＝、／”ｌ’ｓＩ（ωＴｈｄ
ｆで表はされるので、復調信号成分ｙ（ｔ）”” ２１
Ｅ となる。Here, the electric field IE is °IE=, /”l'sI(ωThd
Since it is represented by f, the demodulated signal component y(t)"" 21
It becomes E.
このことば光成分は殆んど電気成分となることであり、
この場合の雑音室カスベクトルを１． ＩＫとお １Ｅ
〈とＳ／Ｎ−〜−となシＳ／Ｎは最大となる。This means that the light component is mostly electrical component,
The noise chamber cass vector in this case is 1. When IK and 1E < and S/N - ~ -, S/N becomes maximum.
１に これはｙ２（ｔ）についても同様である。to 1 The same applies to y2(t).
（ｆ） 発明の効果
以上詳細に説明せる如く本発明によれば、単一偏波保存
単一モード光ファイバにて伝送されたＮ種類の位相変調
されたスペクトル波形の超高速度光位相変調波信号を最
高のＳ／Ｎで彷ル【４出来る効果がある。(f) Effects of the Invention As explained in detail above, according to the present invention, ultra-high speed optical phase modulated waves of N types of phase modulated spectral waveforms transmitted through a single polarization maintaining single mode optical fiber. It has the effect of allowing the signal to roam at the highest S/N.
′第１図は本発明の実施例の３個に振巾分割した場合の
復調回路のブロック図、第２図は本発明の実施例の２個
に波面分割した場合の復調回路のブロック図である。
図中１〜４，３〜７，１４は単一偏波保存・単一モード
光７フイバ、８，９，１０，１６．１７は光位相整合用
空ｉｊｊ ｙイルタ、１１〜１３．１８゜１９１″ｌ：
光検知器を示す。
！；'Figure 1 is a block diagram of a demodulation circuit when the amplitude is divided into three parts according to an embodiment of the present invention, and Figure 2 is a block diagram of a demodulation circuit when the wave front is divided into two parts according to an embodiment of the present invention. be. In the figure, 1 to 4, 3 to 7, and 14 are single polarization-maintaining, single mode optical 7 fibers, 8, 9, 10, 16.17 are optical phase matching air ijj y filters, 11 to 13.18° 191″l:
A photodetector is shown. ! ;
Claims (1)
種類の位相変調されたスペクトル波形の超高速度光位相
変調波信号Ｓ＋（ω）・ε−ｊωｔ・・ＳＮ（→・εｊ
″ｔ （但しｔは時間、ω＝２πｆ、ｆは超高速度光位
相変調波信号の周波数）を復調する場合、位相変調され
たスペクトル波形の種類の数Ｎに応じて該超高速度光位
相変調波信号の波面又は振巾をＮ等分し、夫々九を、受
信光波伝達関数ｙ＋（（ロ）・・・Ｓ＋ （ｎ＊・ε”
”’ −＝ＹＮＯ＝ Ｓ Ｎ（ω）” ・ｉ −””
（ｆｆｌしｔｏは光波が入力して立上る迄の遅延時間〕
に夫々れ調整されたＮ個の光位相整合用空間フィルタに
入力し夫々れ復調波成分 ７１ （ｔ）＝ｆ ： ｓ＋ （→Ｙ１′（→ε−ｊｃ
ａ（ｔ−ｔｏ）ｄｆ・・川・’Ｉ Ｎ（ｔ）”＝ 、１
．、 Ｓ Ｎ（→ＹＮ（→ε−ｊａ＋（ｔ ｔｏ）ｃＨ
を発生させこれを夫々の光検知器に入力し、電気信号に
変換された復調信号を取出すようにしたことを特徴とす
る超高速度光位相変調波復調方式。[Claims] N
Ultra-high speed optical phase modulated wave signals S+(ω)・ε−jωt・・SN(→・εj
When demodulating ``t (where t is time, ω = 2πf, f is the frequency of the ultra-high-speed optical phase modulated wave signal), the ultra-high-speed optical phase is Divide the wavefront or amplitude of the modulated wave signal into N equal parts, and divide each nine into the received light wave transfer function y+((b)...S+ (n*・ε")
”' −=YNO=S N(ω)” ・i −””
(ffl to is the delay time from when the light wave is input until it rises)
The demodulated wave components 71 (t)=f : s+ (→Y1′(→ε−jc
a(t-to)df・・川・'I N(t)”= , 1
．． , SN(→YN(→ε−ja+(t to)cH
An ultra-high-speed optical phase modulation wave demodulation system characterized in that the generated signal is input to each photodetector, and a demodulated signal converted to an electrical signal is extracted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58108811A JPS60428A (en) | 1983-06-17 | 1983-06-17 | Demodulating system of superhigh-speed optical phase modulated wave |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58108811A JPS60428A (en) | 1983-06-17 | 1983-06-17 | Demodulating system of superhigh-speed optical phase modulated wave |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60428A true JPS60428A (en) | 1985-01-05 |
Family
ID=14494088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58108811A Pending JPS60428A (en) | 1983-06-17 | 1983-06-17 | Demodulating system of superhigh-speed optical phase modulated wave |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60428A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4557578A (en) * | 1984-12-24 | 1985-12-10 | Eastman Kodak Company | Viewfinder for autofocus cameras |
| US6721477B2 (en) * | 2000-05-05 | 2004-04-13 | Jds Uniphase Inc. | Dispersion-free optical filters |
-
1983
- 1983-06-17 JP JP58108811A patent/JPS60428A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4557578A (en) * | 1984-12-24 | 1985-12-10 | Eastman Kodak Company | Viewfinder for autofocus cameras |
| US6721477B2 (en) * | 2000-05-05 | 2004-04-13 | Jds Uniphase Inc. | Dispersion-free optical filters |
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