DK169193B1 - Receive preamplifier for an optical communication connection - Google Patents

Receive preamplifier for an optical communication connection Download PDF

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Publication number
DK169193B1
DK169193B1 DK255689A DK255689A DK169193B1 DK 169193 B1 DK169193 B1 DK 169193B1 DK 255689 A DK255689 A DK 255689A DK 255689 A DK255689 A DK 255689A DK 169193 B1 DK169193 B1 DK 169193B1
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DK
Denmark
Prior art keywords
amplifier
counter
receiving
diode
preamplifier
Prior art date
Application number
DK255689A
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Danish (da)
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DK255689A (en
DK255689D0 (en
Inventor
Sungar Aytac
Hoang Do Van
Michael Gwiazdowski
Original Assignee
Krone Ag
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Publication of DK255689D0 publication Critical patent/DK255689D0/en
Publication of DK255689A publication Critical patent/DK255689A/en
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Publication of DK169193B1 publication Critical patent/DK169193B1/en

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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
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/69—Electrical arrangements in the receiver
    • H04B10/693—Arrangements for optimizing the preamplifier in the receiver
    • H04B10/6933—Offset control of the differential preamplifier
    • 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
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/69—Electrical arrangements in the receiver

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Amplifiers (AREA)

Abstract

The invention relates to a receiving preamplifier of an amplifier (1) which is preceded by an avalanche photodiode (APD) as receiving diode in the reverse direction and a capacitor (C1) and which has negative feedback via a resistor (RF). To create a receiving preamplifier which also properly functions with high received light powers and thus has a wide dynamic range, a PIN diode (PD) is connected in series in the forward direction with the avalanche photodiode (APD). <IMAGE>

Description

DK 169193 Bl iDK 169193 Bl i

Opfindelsen angår en modtageforforstærker ifølge indledningen til krav 1.The invention relates to a receiver preamplifier according to the preamble of claim 1.

Fra GB-A-2 096852 kendes en optisk modtageforforstærker af den indledningsvis omtalte art. Modtageforforstærkeren 5 indeholder en forstærker, foran hvilken er indkoblet en fotodiode som modtagediode i spærreretningen og i serie med modtagedioden en PIN-diode i gennemgangsretningen. Ulempen ved denne modtageforforstærker med en modforvrængning over tre dekader er, at der ikke kan ses bort fra støjen i for-10 stærkeren, eftersom der er tale om en nedsat følsomhed. Et følsomhedstab kan kun undgås, når modforvrængningen er opbygget aktiv og i flere trin. Til dette formål er det nødvendigt med et højere forbrug i kredsløbet og en kraftigere justering (modforvrængeren er som følge heraf toleranceføl-15 som).GB-A-2 096852 discloses an optical receiving amplifier of the type mentioned initially. The receive preamplifier 5 contains an amplifier, in front of which a photodiode is connected as a receive diode in the blocking direction and in series with the receive diode a PIN diode in the through direction. The disadvantage of this receiver preamplifier with a counter distortion over three decades is that the noise in the amplifier cannot be ignored as there is a decreased sensitivity. A loss of sensitivity can only be avoided when the counter distortion is built up actively and in several steps. For this purpose, a higher consumption of the circuit and a stronger adjustment is required (the counter-scrambler is as a result tolerance tolerance).

Det er således formålet med opfindelsen at tilvejebringe en modtageforforstærker af den indledningsvis omhandlede art, som har en højere dynamik, og som under overvindelse af ulemperne ved den kendte teknik tillige ikke 20 overstyres ved høje modtagelyseffekter.It is thus the object of the invention to provide a receiver amplifier of the type of preamble which has a higher dynamics and which, while overcoming the disadvantages of the prior art, is also not overpowered by high reception light effects.

Dette formål opnås ved en modtageforforstærker, som ifølge opfindelsen er ejendommelig ved den i krav l's kendetegnende del angivne udformning. Ved opfindelsen arbejder forstærkeren ved tilbagekoblingsmodstanden ved små lysef-25 fekter som trans impedans forstærker, hvor udgangsspændingen på forstærkeren er proportional med fotostrømmen, og hvor der ikke er behov for en modforvrænger. Ved store lyseffekter nedreguleres forstærkerens forstærkning automatisk, således at forstærkeren lige netop ikke bliver overstyret. Eftersom 30 båndbredden af transimpedansforstærkeren ved reducering af forstærkerens forstærkning kun med en faktor 3 bliver mindre end den krævede båndbredde, er kun et modforvrængertrin nødvendigt.This object is achieved by a receiving preamplifier, which according to the invention is characterized by the design according to the characterizing part of claim 1. In the invention, the amplifier operates at the feedback resistance at small light effects as a trans-impedance amplifier, where the output voltage of the amplifier is proportional to the photocurrent and where no counter-distortion is needed. In the case of large light effects, the amplifier's gain is automatically down-regulated, so that the amplifier just does not get overpowered. Since, by reducing the gain of the amplifier only by a factor of 3, the bandwidth of the transimpedance amplifier becomes less than the required bandwidth, only a counter distortion step is necessary.

Yderligere fordelagtige udførelsesformer af opfindel-35 sen fremgår af underkravene. Her henvises især til udførelsesformen ifølge krav 2, hvori modforvrængeren er tilveje- DK 169193 B1 2 bragt med en PIN-diode.Further advantageous embodiments of the invention are apparent from the subclaims. In particular, reference is made to the embodiment of claim 2, wherein the counter-scrambler is provided with a PIN diode.

En eksempelvis udførelsesform af modtageforforstærkeren ifølge opfindelsen forklares i det følgende nærmere under henvisning til tegningen, på hvilken: 5 fig. 1 anskueliggør den eksempelvise udførelsesform af en modtageforforstærker med en fotodiode som modtagediode.An exemplary embodiment of the receiving amplifier according to the invention is explained in greater detail below with reference to the drawing, in which: FIG. 1 illustrates the exemplary embodiment of a receive preamplifier with a photodiode as a receive diode.

I fig. 1 er vist en modtageforforstærker med en PIN-fotodiode PPD som modtagediode, og med et styrekredsløb til forstærkeren 1.In FIG. 1 is shown a receive preamplifier with a PIN photodiode PPD as the receive diode, and with a control circuit for the amplifier 1.

10 Styrekredsløbet består af en modforvrænger 2, en bufferkreds 3, en spidsværdidetektor 4 og to styreforstærkere 5 og 6. En i spærreretningen forbundet PIN-fotodiode PPD og en kondensator Cl er forbundet foran forstærkeren 1. I serie med PIN-*fotodioden PPD er forbundet en PIN-diode PD i gennem-15 gangsretningen.10 The control circuit consists of a counter-scrambler 2, a buffer circuit 3, a peak value detector 4, and two control amplifiers 5 and 6. A PIN photodiode PPD connected in the blocking direction and a capacitor C1 are connected in front of the amplifier 1. In series the PIN * photodiode PPD is connected. a PIN diode PD in the through direction.

En tilbagekoblingsmodstand RF med stor modstandsværdi er forbundet med indgangen E og udgangen A på forstærkeren 1. Over udgangen A på forstærkeren 1 ligger udgangsspændingen Ual. Bag forstærkeren 1 er modforvrængeren 2 forbundet, 20 hvilken modforvrænger er opbygget af en ved en spænding Uq2 styrbar PIN-diode PD1, en fast kondensator C3 og en fast modstand R3. På udgangen af modforvrængeren 2 er spidsværdidetektoren 4 over en kondensator C4 forbundet med de to herefter indkoblede styreforstærkere 5 og 6, hvilke styrefor-25 stærkere har styrende virkning på forstærkeren 1 og modforvrængeren 2.A high resistance value feedback resistor RF is connected to the input E and the output A of the amplifier 1. Above the output A of the amplifier 1, the output voltage Ual. Behind amplifier 1 is connected the resistor 2, which resistor is made up of a pin diode PD1 controllable by a voltage Uq2, a fixed capacitor C3 and a fixed resistor R3. At the output of the counter-scrambler 2, the peak-value detector 4 is connected via a capacitor C4 to the two control amplifiers 5 and 6, which are then connected, which control power has a controlling effect on the amplifier 1 and the counter-scrambler 2.

Ud fra udgangsspændingen Ua3 på bufferkredsen 3 tilvejebringes til spidsværdidetektoren 4 en spændingsregistreringsstørrelse Ujg-j-, hvor ud af styreforstærkeren 5 uddrager 30 spændingen Usl og styreforstærkeren 6 uddrager spændingen Us2. Endvidere er der på udgangen af modforvrængeren 2 forbundet en bufferkreds 3, på hvis udgang udgangsspændingen Ua3 fra modtageforforstærkeren registreres.From the output voltage Ua3 of the buffer circuit 3, a peak detection size Ujg-j- is provided to the peak value detector 4, where out of the control amplifier 5 the voltage Usl is extracted and the control amplifier 6 extracts the voltage Us2. Furthermore, a buffer circuit 3 is connected to the output of the counter-scrambler 2, on which the output voltage Ua3 of the receive amplifier is detected.

Herefter forklares funktionen af modtageforforstær-35 keren ifølge fig. 1 nærmere. Ved mindre modtagelyseffekter PL er modstanden af PIN-dioden PD større, end forholdet DK 169193 B1 3 mellem tilbagekoblingsmodstanden og forstærkningen A. Lyseffekten er således direkte proportional med spids-spidsstørrelsen Ualss på udgangen A på forstærkeren 1 og tilbagekoblingsmodstanden Rp. Udgangsspændingen UIst på spids-5 værdidetektoren 4 er herved nul.Next, the operation of the receive amplifier of FIG. 1 closer. For smaller receiving light effects PL, the resistance of the PIN diode PD is greater than the ratio DK 169193 B1 3 between the feedback resistor and the gain A. Thus, the light effect is directly proportional to the peak tip size Ualss at the output A of the amplifier 1 and the feedback resistor Rp. The output voltage UIst of the peak-5 value detector 4 is hereby zero.

Styreforstærkeren 5 med udgangsspændingen Ugi og styreforstærkeren 6 med udgangsspændingen Ug2 er således dimensionerede, at der opnås en udpeget forstærkning A, og at modstanden af PIN-dioden PD1 er så lille, at modforvræn-10 geren 2 ikke virker modforvrængende.The control amplifier 5 with the output voltage Ugi and the control amplifier 6 with the output voltage Ug2 are dimensioned such that a designated amplification A is obtained and that the resistance of the PIN diode PD1 is so small that the counter-transformer 2 does not act as a distortion.

Ved større modtagelyseffekt PL er modstanden af PIN--dioden PD mindre, end forholdet mellem tilbagekoblingsmodstanden Rp og forstærkningen A. I dette tilfælde afhænger spids-spidsspændingsstørrelsen ualss ikke mere af tilbagekob-15 lingsmodstanden Rp og når sin maksimalværdi. Den krævede følsomhed opnås gennem tilbagekoblingsmodstanden Rp med den store modstandsværdi.At greater receiving light power PL, the resistance of the PIN diode PD is less than the ratio of the feedback resistor Rp to the gain A. In this case, the peak peak voltage magnitude no longer depends on the feedback resistor Rp and reaches its maximum value. The required sensitivity is obtained through the feedback resistor Rp with the high resistance value.

For at forstærkeren 1 ikke skal overstyres, skal forstærkningen A nedsættes ved styreforstærkeren 5. X dette 20 tilfælde sænkes den øvre grænsefrekvens for forstærkeren 1 således, at frekvensgangen ved modforvrængeren 2 modforvræn ges. Styreforstærkeren 6 med udgangsspændingen Us2 styrer herved modforvrængeren 2 over PIN-dioden PD1.In order for the amplifier 1 not to be overridden, the amplifier A must be lowered at the control amplifier 5. In this case, the upper limit frequency of the amplifier 1 is lowered so that the frequency response at the counter-amplifier 2 is counter-distorted. The control amplifier 6 with the output voltage Us2 thus controls the counter-scrambler 2 over the PIN diode PD1.

Claims (3)

1. Modtageforforstærker til modtagelse og til forstærkning af optiske signaler fra en optisk kommunikations- 5 overføringsstrækning, som indbefatter en forstærker (1) , foran hvilken er indkoblet en fotodiode (PPD) i spærreretningen som modtagediode og i serie med modtagedioden en PIN-diode (PD) i gennemgangsretningen, kendetegnet ved, at der foran forstærkeren (1) er indkoblet en 10 kondensator (Cl) og at der efter forstærkeren (1) er indkoblet en modforvrænger (2) og en spidsværdidetektor (4), hvilken spidsværdidetektor tilvejebringer en spændingsregistreringsværdi (Uist) til to styreforstærkere (5,6), som styrer forstærkeren (1) og modforvrængeren (2), og at for-15 stærkeren (1) er modkoblet over en modstand (RF).A receiver amplifier for receiving and amplifying optical signals from an optical communication transmission line, including an amplifier (1), in front of which is a photodiode (PPD) in the blocking direction as a receiving diode and in series with the receiving diode a PIN diode ( PD) in the through direction, characterized in that a capacitor (C1) is connected in front of the amplifier (1) and after the amplifier (1) a countercorruptor (2) and a peak value detector (4) are provided, which peak voltage detector provides (Uist) to two control amplifiers (5,6) which control the amplifier (1) and the counter-amplifier (2), and that the amplifier (1) is coupled over a resistor (RF). 2. Modtageforforstærker ifølge krav 1, kendetegnet ved, at modforvrængeren (2) er tilvejebragt med en PIN-diode (PD1) med en parallel forbundet kondensator (C3). 20Receiver preamplifier according to claim 1, characterized in that the counter-converter (2) is provided with a PIN diode (PD1) with a parallel connected capacitor (C3). 20 3. Modtageforforstærker ifølge krav 1 eller 2, k e n- detegnet ved, at en bufferkreds (3) til forhindring af tilbagekobling er forbundet efter modforvrængeren (2).Receiver preamplifier according to claim 1 or 2, characterized in that a buffer circuit (3) for preventing feedback is connected after the counter-scrambler (2).
DK255689A 1988-05-26 1989-05-25 Receive preamplifier for an optical communication connection DK169193B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3818168A DE3818168A1 (en) 1988-05-26 1988-05-26 RECEIVER PRE-AMPLIFIER FOR AN OPTICAL MESSAGE RANGE
DE3818168 1988-05-26

Publications (3)

Publication Number Publication Date
DK255689D0 DK255689D0 (en) 1989-05-25
DK255689A DK255689A (en) 1989-11-27
DK169193B1 true DK169193B1 (en) 1994-09-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
DK255689A DK169193B1 (en) 1988-05-26 1989-05-25 Receive preamplifier for an optical communication connection

Country Status (8)

Country Link
EP (1) EP0344091B1 (en)
AT (1) ATE96955T1 (en)
AU (1) AU614595B2 (en)
DE (2) DE3818168A1 (en)
DK (1) DK169193B1 (en)
ES (1) ES2047704T3 (en)
IL (1) IL89629A0 (en)
NZ (1) NZ228264A (en)

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DE4106778A1 (en) * 1991-03-04 1992-09-10 Standard Elektrik Lorenz Ag OPTICAL-ELECTRIC CONVERTER WITH EXTENDED DYNAMICS
DE4107849A1 (en) * 1991-03-12 1992-09-17 Licentia Gmbh PN photodiode optical amplifier with integral feedback - utilises resistive feedback line to maintain photodiode operating parameters in response to varying light conditions
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US6494370B1 (en) * 1997-12-11 2002-12-17 Ceyx Technologies Electro-optic system controller and method of operation
US6629638B1 (en) 1997-12-11 2003-10-07 Ceyx Technologies Electro-optic system controller and method of operation
DE19821865A1 (en) * 1998-05-15 1999-11-18 Siemens Ag Receiver circuit for optical signal especially infrared signal
US20030043025A1 (en) * 2000-03-28 2003-03-06 Katsuhiko Inoue Apparatus for totaling/analyzing replies using infrared optical communication, and signal amplifier suitable for that apparatus
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JP2007508754A (en) * 2003-10-17 2007-04-05 ツエントルム・ミクロエレクトロニク・ドレスデン・アクチエンゲゼルシャフト Method and apparatus for converting optical received pulse train to electrical output pulse train
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Also Published As

Publication number Publication date
ATE96955T1 (en) 1993-11-15
NZ228264A (en) 1991-02-26
AU614595B2 (en) 1991-09-05
EP0344091B1 (en) 1993-11-03
IL89629A0 (en) 1989-09-10
DE3818168C2 (en) 1991-03-14
EP0344091A3 (en) 1991-08-28
DK255689A (en) 1989-11-27
EP0344091A2 (en) 1989-11-29
ES2047704T3 (en) 1994-03-01
DE58906073D1 (en) 1993-12-09
DK255689D0 (en) 1989-05-25
AU3264989A (en) 1989-11-30
DE3818168A1 (en) 1990-04-05

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B1 Patent granted (law 1993)
PBP Patent lapsed