JPH02268285A - Phase synchronous type light receiver - Google Patents

Abstract

PURPOSE:To achieve an accurate measurement of distances by inputting a signal to be modulated into a 90 deg. hybrid to input a 0 deg. output and 90 deg. output to voltage control amplifiers respectively. CONSTITUTION:This light receiver uses a 90 deg. hybrid 7, voltage control amplifiers B. C2b and 2c, an adder 8 and a switch 9 to control a phase of a carrier to be modulated so that a change in delay time, namely, a distance measuring error is reduced. In other words, when a plurality of phase modulation signals are given, the switch 9 is changed over to control a phase of the carrier by addition thereof to an output signal of the voltage control amplifier C(2c) for vector synthesization thereof. As a signal with an optional phase can be formed by varying an amplitude of output signals of the voltage control amplifiers B and C, a phase within a circuit can be controlled. This enables suppression of a change in delay time, namely, a distance measuring error as caused by a distortion.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、単一搬送波に位相変調された被変調信号を
光強度変調する光空間通信において、全問の距離を測定
するための被変調信号を復調する位相同期型光受信機の
遅延時間特性の改善に関するものであり１％に被数波間
時変調時における受信機内の遅延時間特性の改善に効力
を発揮するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a modulated signal for measuring the distance of all questions in optical space communication in which a modulated signal whose phase is modulated to a single carrier wave is modulated with optical intensity. This invention relates to improving the delay time characteristics of a phase-locked optical receiver that demodulates signals, and is effective in improving the delay time characteristics within the receiver during time modulation between signal waves to 1%.

〔従来の技術〕[Conventional technology]

第３図は従来の位相同期型光受信機の構成を示したもの
である。図において、（ｌ）は増幅器、（２１は電圧制
御増幅器、１３１ｉｊ位相検波器、　＋４１Ｆｉローパ
スフイルタ、１５１は検波器、Ｃ６１は発振器、　ａｎ
は光入力信号を電気信号に変換するホトダイオードであ
る。FIG. 3 shows the configuration of a conventional phase synchronized optical receiver. In the figure, (l) is an amplifier, (21 is a voltage control amplifier, 131ij phase detector, +41Fi low pass filter, 151 is a detector, C61 is an oscillator,
is a photodiode that converts an optical input signal into an electrical signal.

増幅器ｉｌｌに入力された禎変調信号は増幅され。The modulated signal input to the amplifier ill is amplified.

電圧制御増幅器＋２１を介して位相検波され、ローパス
フィルタ（４１を通って測距用信号として復ｖＩ！４−
ｇれる。一方、増幅器（１）の出力信号が位相同期系用
の信号として出力される。The phase is detected via the voltage control amplifier +21, and the signal is returned as a ranging signal through the low-pass filter (41).
I can get it. On the other hand, the output signal of the amplifier (1) is output as a signal for the phase synchronization system.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

従来の位相同期型光受信機では位相変ｉ１４信号の変調
信号が大きくなると、虫が増大し１位相が回転し、遅延
時間が変動し、測距に誤差が生ずる。In a conventional phase-locked optical receiver, when the modulation signal of the phase-shifted i14 signal increases, the number of insects increases, one phase rotates, the delay time fluctuates, and an error occurs in distance measurement.

位相ｆ詞信号が単一の場合、その信号の変調指数は一般
に小きく設定されているため、上記の問題が生じないが
複数波により変調はれた場合、総合の変調指数が大きく
なり、歪に起因する位相回転が住じ、上記同様の測距に
誤差が生じるという欠点があった。When the phase f-word signal is single, the modulation index of that signal is generally set small, so the above problem does not occur, but if it is modulated by multiple waves, the total modulation index becomes large and distortion occurs. This has the disadvantage that phase rotation due to this occurs, and errors occur in distance measurement similar to those described above.

この発明は上記のような課題を解決するために。This invention aims to solve the above-mentioned problems.

電圧制御増幅器を２個追加し、その利得を制御電圧によ
り制御し、更に２個の増幅器出力をベクトル合成し、変
調指数が大きくなった場合においても歪による位相回転
に起因する測距誤差を改善する事を目的とする。Two voltage-controlled amplifiers are added, their gains are controlled by the control voltage, and the outputs of the two amplifiers are vector-combined to improve ranging errors caused by phase rotation due to distortion even when the modulation index becomes large. The purpose is to do.

〔課題を解決するための手段〕[Means to solve the problem]

この発明に係る位相同期型光受信機は、被費調信号を９
０°ハイブリツドに入力し　００出力と９０’出力をそ
れぞれ電圧制御増幅器に入力し、各々の増幅器の利得を
複数波ｆ調波である事を検出する検出器の出力信号によ
り制御し、被変訓信号が複数となった場合、スイッチを
制御し各々の増幅器の出力をベクトル合成し９次段に出
力するものである。The phase-synchronized optical receiver according to the present invention transmits a toned signal of 9
The 0° hybrid is input, the 00 output and the 90' output are each input to a voltage control amplifier, and the gain of each amplifier is controlled by the output signal of a detector that detects multiple f harmonics. When there are multiple signals, the switches are controlled and the outputs of the respective amplifiers are vector-combined and output to the ninth stage.

〔作用〕[Effect]

この発明における位相同期型光受信機は、被変１ｌ１４
信号が複数となった場合、スイッチを制御し。The phase synchronized optical receiver in this invention has variable 1l14
If there are multiple signals, control the switch.

上記各々の電圧制御増幅器の出カケベクトル合成し、複
数波による位相変調によって位相ｆ調指数が大きくなっ
た場合の歪による位相回転を小さくする。The output vectors of each of the above voltage controlled amplifiers are combined to reduce phase rotation due to distortion when the phase f harmonic index becomes large due to phase modulation using multiple waves.

〔実施例〕〔Example〕

第１図は、この発明の一実施例を示す図であり。 FIG. 1 is a diagram showing an embodiment of the present invention.

（り〜１６１．　（１７１は第３図と同一のものである
。(161. (171 is the same as in FIG. 3.

（２ｂ）、　（２Ｃ）は電圧制御増幅器Ｂ、　Ｃ”、　
１７＋Ｆｉ９０゜バイア’　ＩＪフッド（８１は加算器
、ｃ９）はスイッチ、ａｉｄ制御電圧発生器、　（Ｉｎ
はＯＲゲート、ｎｚは２個号検出器、α３は３個号検出
器である。(2b), (2C) are voltage controlled amplifiers B, C'',
17+Fi90° via' IJ hood (81 is adder, c9) is switch, aid control voltage generator, (In
is an OR gate, nz is a 2-order detector, and α3 is a 3-order detector.

測距用信号の復調の動作は第３図と同一であるが１本発
明では９０°ハイブリッド＋７１．　＠圧制御増幅器Ｂ
及びｃ　（ｚｂ）、　（２Ｃ）　、加算器＋８１．　　
スイッチ（９１を用いて、被変調搬送波の位相を制御し
、遅延時間の変動すなわち測距誤差を小きくするもので
ある。つまり１位相変調信号が複数の場合は、スイッチ
（９）を切換えて、１！を圧制御増幅器Ｃ（２ｃ）　の
出力信号を加算器＋８１に入力し、電圧制御増幅器Ｂ（
２ｂ）の出力信条と加其、ベクトル合成する事により搬
送波の位相を制御するものである。ベクトル合成の原理
は第２図に示すとうりで、（１４ｒｉ電圧制御増幅器Ｂ
　（ｚｂ）の出力信号、ａＳは電圧制御増幅器Ｃ（２ｃ
）の出力信号、　（１６１は加算器（８）の出力のベク
トル合成後の信号である。第１図から分かる様に。The demodulation operation of the ranging signal is the same as that shown in FIG. 3, but in the present invention, the 90° hybrid +71. @Pressure control amplifier B
and c (zb), (2C), adder +81.
The switch (91) is used to control the phase of the modulated carrier wave to reduce variation in delay time, that is, distance measurement error.In other words, when there are multiple 1 phase modulation signals, switch (9) is used to , 1! are input to the adder +81, and the output signal of the pressure control amplifier C (2c) is inputted to the adder +81.
The phase of the carrier wave is controlled by vector synthesis with the output principle of 2b). The principle of vector synthesis is as shown in Figure 2.
(zb) output signal, aS is the voltage controlled amplifier C (2c
), (161 is the signal after vector synthesis of the output of the adder (8). As can be seen from FIG. 1.

電圧制御増幅器Ｂ及びＣの出力信号α４１．＋Ｉｓの振
幅を変える事により、任意位相φの信号を形成出来るた
め、Ｗ圧制御増幅器Ｂ、　　Ｃの利得を制御する帛によ
り２回路内の信号の位相を制御出来る。電圧制御増幅器
Ｂ、　　Ｃ（２ｂ）（２ｃ）の制御電圧は、測距用信号
及び切換用コマンド入力から２信号検出器αΔ、３信号
検出器ｆｉ３により変ｉＪ４波の数を検出し。Output signals α41. of voltage controlled amplifiers B and C. By changing the amplitude of +Is, a signal with an arbitrary phase φ can be formed, so the phase of the signals in the two circuits can be controlled by the device that controls the gains of the W-pressure control amplifiers B and C. The control voltages of the voltage control amplifiers B, C (2b) and (2c) are determined by detecting the number of variable iJ4 waves using a two-signal detector αΔ and a three-signal detector fi3 from the ranging signal and switching command input.

その信号に基つき、制御電圧発注器α・より制御電圧が
出力される。Based on the signal, a control voltage is output from the control voltage orderer α.

なお、上記実施例で／ｆ１２信号検出器［１ｊ、３個号
検出器ｆ１３を設けたが、これＦｉ搬送波に位相変調す
る変調波の数により賢更する事は言うまでもない。In the above embodiment, the /f12 signal detector [1j and the 3-signal detector f13 are provided, but it goes without saying that this can be modified depending on the number of modulated waves phase-modulated to the Fi carrier wave.

また、実施例では９０°ハイブリツド（７）を用いてい
るが、これハ９０°、０°の位相に分割出来るものであ
れば他のもの例えば９０°分配器などでも良い。Further, although a 90° hybrid (7) is used in the embodiment, other devices such as a 90° distributor may be used as long as it can be divided into phases of 90° and 0°.

〔発明の効果〕〔Effect of the invention〕

この発明は１以上に示した様に複数波で位相変調されて
いる場合において、その変調波の数に応じて搬送波の位
相を変える事により２回路内の位相を制御し、歪に起因
する遅延時間変動、すなわち、測距の誤差を抑制する効
果がある。This invention controls the phase in two circuits by changing the phase of the carrier wave according to the number of modulated waves when the phase is modulated by multiple waves as described above, and eliminates the delay caused by distortion. This has the effect of suppressing time fluctuations, that is, errors in distance measurement.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は、この発明の一実施例を示す位相同期型光受信
機のブロック図、第２図はこの発明において位相を制御
するための信号のベクトル合成の原理を示す図、第３図
は従来の位相同期型光受信機のブロック図である。ｆｉ
＋は増幅器、　　（２ａ）、　（２ｂ）。 （２Ｃ）は電圧制御増幅器、（３）は位相検波器、（４
１はローパスフィルタ、（５１は検波器、（６１に発揚
器、（７）は９０°ハイブリツド、（８）は加算器、（
９）はスイッチ。 αＩＩＩは制御電圧発生器、　ｔｔｕはＯＲゲート、α
３は２信号検出器、　Ｑ３に３信号検出器、　ａａは電
圧制御増幅器Ｂ　（２ｂ）の出力（ｇ号、西は電圧制御
増幅器＠器Ｃ（２ｃ）の出力信号、αＢｉｄ加算器（８
）の出力信号、　（１７＋はホトダイオードである。 尚９図中、同一あるいは相当部分には同一符号を付して
示しである。FIG. 1 is a block diagram of a phase-locked optical receiver showing an embodiment of the present invention, FIG. 2 is a diagram showing the principle of vector synthesis of signals for controlling the phase in this invention, and FIG. FIG. 1 is a block diagram of a conventional phase-locked optical receiver. fi
+ is an amplifier, (2a), (2b). (2C) is a voltage controlled amplifier, (3) is a phase detector, (4
1 is a low-pass filter, (51 is a detector, (61 is a lifter, (7) is a 90° hybrid, (8) is an adder, (
9) is a switch. αIII is the control voltage generator, ttu is the OR gate, α
3 is a 2-signal detector, Q3 is a 3-signal detector, aa is the output of voltage controlled amplifier B (2b) (g, west is the output signal of voltage controlled amplifier @ device C (2c), αBid adder (8
), (17+ is a photodiode. In Figure 9, the same or corresponding parts are indicated by the same reference numerals.

Claims (1)

【特許請求の範囲】[Claims] 単一搬送波に位相変調された被変調信号を光強度変調す
る光空間伝送方式における被変調信号を復調する位相同
期型光受信機において、被変調信号から位相の９０°異
なる信号を出力する９０°ハイブリッドと、上記ハイブ
リッドの０°出力に接続され、外部位加電圧により利得
を制御出来る電圧制御増幅器Ｂと、上記ハイブリッドの
９０°出力に接続される電圧制御増幅器Ｃと後者の電圧
制御増幅器Ｃに接続され、その信号をＯＮ／ＯＦＦする
スイッチと上記ハイブリッドの０°出力に接続された電
圧制御増幅器Ｂの出力信号と上記スイッチの出力信号を
加算する加算器と位相変調された信号が２信号及び３信
号である事を検出する２信号検出器、３信号検出器と２
つの検出器に接続されて、２信号及び３信号変調の場合
、上記スイッチを切換えるための信号を出力するＯＲゲ
ートと上記２つの検出器の出力信号より上記２つの電圧
制御増幅器Ｂ、Ｃへ、制御電圧を出力する制御電圧発生
器を備え、複数信号により位相変調された場合でも光受
信機内での遅延時間が一定となり、測距を精度良く行う
事が出来るようにした事を特徴とする位相同期型光受信
機。In a phase-synchronized optical receiver that demodulates a modulated signal in an optical space transmission system that modulates the optical intensity of a modulated signal that has been phase-modulated onto a single carrier wave, a 90° signal that outputs a signal that is 90° different in phase from the modulated signal is used. A hybrid, a voltage controlled amplifier B connected to the 0° output of the hybrid and whose gain can be controlled by an externally applied voltage, a voltage controlled amplifier C connected to the 90° output of the hybrid, and the latter voltage controlled amplifier C. A switch is connected to turn the signal ON/OFF, an adder adds the output signal of the voltage control amplifier B connected to the 0° output of the hybrid, and the output signal of the switch, and the phase modulated signal is 2 signals and 2 signal detector to detect 3 signals, 3 signal detector and 2
an OR gate that outputs a signal for switching the switch in the case of two-signal and three-signal modulation, and an output signal of the two detectors to the two voltage-controlled amplifiers B and C; The phase control system is equipped with a control voltage generator that outputs a control voltage, and even when phase modulated by multiple signals, the delay time within the optical receiver remains constant, enabling distance measurement to be performed with high accuracy. Synchronous optical receiver.