WO2000025458A1 - Dispositif d'emission optique - Google Patents

Dispositif d'emission optique Download PDF

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Publication number
WO2000025458A1
WO2000025458A1 PCT/JP1998/004825 JP9804825W WO0025458A1 WO 2000025458 A1 WO2000025458 A1 WO 2000025458A1 JP 9804825 W JP9804825 W JP 9804825W WO 0025458 A1 WO0025458 A1 WO 0025458A1
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WO
WIPO (PCT)
Prior art keywords
signal
optical
transmission
external modulation
transmission device
Prior art date
Application number
PCT/JP1998/004825
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English (en)
Japanese (ja)
Inventor
Yuji Tochio
Original Assignee
Fujitsu Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu Limited filed Critical Fujitsu Limited
Priority to PCT/JP1998/004825 priority Critical patent/WO2000025458A1/fr
Publication of WO2000025458A1 publication Critical patent/WO2000025458A1/fr

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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
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H04B10/505—Laser transmitters using external modulation
    • H04B10/5059—Laser transmitters using external modulation using a feed-forward signal generated by analysing the optical or electrical input
    • H04B10/50593—Laser transmitters using external modulation using a feed-forward signal generated by analysing the optical or electrical input to control the modulating signal amplitude including amplitude distortion
    • 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
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H04B10/505—Laser transmitters using external modulation
    • 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
    • H04B10/50—Transmitters
    • H04B10/564—Power control

Definitions

  • the present invention relates to an optical transmission device, and more particularly to an optical transmission device that performs optical burst transmission.
  • a passive optical network (PON) system in which a single optical fiber is shared by a plurality of subscribers has attracted attention mainly in Europe.
  • Development is progressing toward the realization of an FTTH (Fiber To The Home) system that lays iba to each home.
  • FTTH Fiber To The Home
  • ATM Asynchronous Transfer Mode
  • FIG. 15 is a diagram showing a waveform when the semiconductor laser is driven. (A) shows the case where the semiconductor laser having a large threshold current is driven without bias, and (B) shows the case where the semiconductor laser is driven with bias.
  • the non-bias drive is a method in which the bias current of the semiconductor laser is set to 0 and the semiconductor laser is driven only by the pulse current corresponding to the input signal.
  • the bias current is set to about the threshold current.
  • the optical output P2 is output even when the logical level of the input signal is "0".
  • the extinction ratio (10 ⁇ 1 og (P1 ZO P2)) defined by the ratio with the optical output P 1 at the time of “” becomes small. As the extinction ratio decreases, the error rate on the receiving side decreases.
  • FIG. 16 is a diagram showing the extinction ratio of the conventional technology.
  • the extinction ratio A is determined by the extinction ratio due to semiconductor laser modulation (the ratio of the optical output of If (semiconductor laser operating current) to the optical output of lb (bias current)) + the extinction ratio of the external modulator.
  • the extinction ratio B (the signal
  • the extinction ratio of "1" / "0" is determined only by the extinction ratio of the external modulator.
  • the extinction ratio A when the signal is not transmitted can be large, but the extinction ratio B is limited by the external modulator's extinction ratio and is limited to about 10 dB at most. However, the extinction ratio cannot be larger than that of the external modulator in the signal transmission section.
  • the present invention has been made in view of such a point, and an object of the present invention is to provide an optical transmission device which does not have a light emission delay and can secure a large extinction ratio at both signal transmission and non-signal transmission. Aim.
  • an optical transmission apparatus 10 for performing optical burst transmission as shown in FIG.
  • Optical signal converting means 11 for converting the signal into optical signals; driving control means 12 for controlling the drive of the optical signal converting means 11 by bias; and detecting whether or not a fixed length signal is not transmitted.
  • a non-transmission detection means 13 that outputs an external modulation control signal CNT that is turned on when a signal is not transmitted and turned off when a signal is transmitted, and emits no optical signal when the external modulation control signal CNT is turned on.
  • an optical transmission device 10 characterized by having an external modulating means 14 for emitting an optical signal.
  • the optical signal converter 11 converts a signal into an optical signal.
  • the drive control means 12 performs bias drive control of the optical signal conversion means 11.
  • the non-transmission detecting means 13 detects whether or not a signal of a certain length is non-transmitted, and outputs an external modulation control signal C NT which is turned on when the signal is not transmitted and turned off when the signal is transmitted.
  • the external modulation means 14 does not emit an optical signal when the external modulation control signal CNT is on, and emits an optical signal when the external modulation control signal CNT is off.
  • FIG. 1 is a diagram illustrating the principle of an optical transmission device according to the present invention.
  • FIG. 2 is a diagram showing the configuration of the ATM-PON system.
  • FIG. 3 is a diagram showing an outline of transmission over PON.
  • FIG. 4 is a diagram showing the configuration of the first embodiment.
  • FIG. 5 is a diagram showing operation waveforms.
  • FIG. 6 is a diagram showing the configuration of the second embodiment.
  • Fig. 7 is a diagram showing the configuration when the APC means is realized by an analog circuit.
  • FIG. 8 is a diagram showing an equivalent circuit of the APC means at the time of signal transmission.
  • FIG. 9 is a diagram showing an equivalent circuit of the APC means when no signal is transmitted.
  • FIG. 10 is a diagram showing a configuration when the APC means is realized by a digital circuit.
  • FIG. 11 is a diagram showing the configuration of the third embodiment.
  • FIG. 12 is a diagram showing a circuit configuration of the average value detecting means.
  • FIG. 13 is a diagram showing the configuration of the fourth embodiment.
  • FIG. 14 is a diagram showing the configuration of the fifth embodiment.
  • FIG. 15 is a diagram showing a waveform when the semiconductor laser is driven.
  • A is a diagram when a semiconductor laser having a large threshold current is driven without bias.
  • B is a diagram when a semiconductor laser having a large threshold current is bias-driven.
  • FIG. 16 is a diagram showing the extinction ratio of the conventional technology. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 is a diagram illustrating the principle of an optical transmission device according to the present invention.
  • the optical transmission device 10 performs optical burst transmission.
  • the optical signal converter 11 converts an electric signal into an optical signal. Specifically, it corresponds to a semiconductor laser.
  • the drive control means 12 performs bias drive control (modulation control) of the optical signal conversion means 11.
  • the non-transmission detecting means 13 detects whether or not a signal of a certain length is non-transmitted. When the signal is not transmitted, ⁇ N, and when the signal is transmitted, the signal is turned off. The external modulation control signal CNT is output.
  • the external modulation means 14 does not emit an optical signal when the external modulation control signal C C is 0 ⁇ , and emits an optical signal when the external modulation control signal C ⁇ is ⁇ FF.
  • the optical transmission device 10 of the present invention does not emit an optical signal by the external modulation means 14 when a signal of a fixed length is not transmitted, and the optical signal conversion means 11 when transmitting a signal. Is driven by a bias, and an optical signal is emitted by the external modulation means 14.
  • the extinction ratio ⁇ ⁇ shown in Fig. 1 is the extinction ratio due to the modulation of the optical signal conversion means 11 (the ratio between the optical output of If (semiconductor laser operating current) and the optical output of lb (bias current)) + external modulation
  • This is the extinction ratio of the means 14 and has the same value as in FIG. 16, but the extinction ratio B a is determined by the extinction ratio of the optical signal conversion means 11.
  • the extinction ratio B in FIG. 16 is limited by the external modulator, the extinction ratio B a of the present invention depends on the setting of If and Ib of the optical signal conversion means 11. The size can be increased more easily than if it were set with an external modulator.
  • the device since the device is driven with bias, there is no light emission delay even for a semiconductor laser having a large threshold, and when the signal is not transmitted, (the optical signal conversion means 1 by the drive control means 12).
  • the extinction ratio A of (extinction ratio of 1) + (extinction ratio of the external modulation means 14 when the external modulation control signal CNT is ON) makes it possible to obtain an extinction ratio almost close to non-emission.
  • ATM—PON system 1 is an optical branching access network using ATM, which is configured by connecting a plurality of subscribers 3a to 3n and station 4 in a n: 1 ratio using a star power library 2. It is.
  • EZO electric Z light conversion
  • 30a to 30n are arranged, respectively, to perform optical burst transmission.
  • These EZOs correspond to the optical transmission device 10 of the present invention.
  • Figure 3 is a diagram showing an outline of transmission over PON.
  • optical signals of the same wavelength are transmitted from each subscriber to the station 4 in a time-sharing manner.
  • the optical signal Op 1 from the subscriber 3 c is at time t 1
  • the optical signal Op 2 from the subscriber 3 b is at time t 2
  • the optical signal ⁇ p 3 from the subscriber 3 a is at time t 3 transmitted.
  • the distance between the subscriber and the star coupler 2 differs, and the optical loss to the star power bracket 2 differs, and so on.
  • the received optical power at station 4 differs for each subscriber.
  • the optical output of the optical signal Op 1 from the subscriber 3 b is equal to the optical output of the optical signal Op 1 from the subscriber 3 b.
  • the phenomenon of light output of 0 may occur.
  • FIG. 4 is a diagram showing the configuration of the first embodiment.
  • the constant length delay means 15 delays the input signal by a certain length. Specifically, the input signal is delayed by one cell length.
  • the non-transmission detecting means 13 comprises low level signal continuous detecting means 13a and high level signal detecting means 13b.
  • the low-level signal continuous detection means 13a regards the case where a low-level signal of a fixed length is continuously detected as signal non-transmission, and turns on the external modulation control signal C NT.
  • the case where a continuous signal of "0" of 1 cell length is detected is regarded as the time of no signal transmission, and in that case, the external modulation control signal CNT is turned ON. In other signal transmissions, the external modulation control signal C NT is 0 F F.
  • the high-level signal detection means 13b outputs a high-level signal (signal) from the output of the fixed-length delay means 15 after the low-level signal continuous detection means 13a detects a continuous "0" signal of one cell length. When the level is detected as "1"), the low-level signal continuous detection means 13a is reset.
  • the drive control means 12 includes an LD driver 12a and an IpZIb control means 12b.
  • the LD driver 12a drives the LD (semiconductor laser) 11 based on the signal output from the fixed-length delay means 15. I do .
  • the I p Z I b control means 12 b controls the I p and I b for the LD drain 12 a.
  • the LD driver 12 a is driven by a drive signal comprising I p ZI b Is output and LD 11 is driven.
  • the LD 11 is modulated by a drive signal from the LD driver 12a to output an optical signal.
  • the external modulation means 14 does not emit the optical signal from the LD 11 when the external modulation control signal C NT is 0N, and emits the optical signal when the external modulation control signal is OFF.
  • FIG. 5 is a diagram showing operation waveforms.
  • the input signal D i is a fixed-length electric signal input to the optical transmission device 10a.
  • 1 cell delay signal D 1 is Ri outputs der constant length delay unit 1 5, an input signal D i a signal delayed one cell length min t "0" continuous detection signal, a low level signal continuously detecting means 13 If a detects "0" continuations for one cell length of the input signal Di
  • the “1" detection signal D2 is an output of the high-level signal detection means 13b, and when "1" of the one-cell delay signal D1 is detected (that is, when the signal is not transmitted and the signal is transmitted). This signal becomes “H” when the time changes.
  • the external modulation control signal CNT is an output of the low-level signal continuous detection means 13a, and is provided with a "0" continuous detection signal and a "1" detection signal D2. Generated from
  • the optical signal output D o is an output of the external modulation means 14 and emits an optical signal D o when the external modulation control signal CNT is OFF, and outputs an optical signal when the external modulation control signal CNT is ⁇ N.
  • the optical output of the optical signal “0” corresponds to (optical output equivalent to bias light emission), and the optical output of the optical signal “0” corresponds to (insertion loss of the external modulation means 14).
  • the optical output of (transmission) corresponds to (optical output equivalent to bias emission) -1 (insertion loss of external modulation means 14 + extinction ratio).
  • the LD driver 12a since the LD driver 12a always performs the bias modulation, the duty is not deteriorated due to the light emission delay.
  • the extinction ratio A between the optical output of the signal "1" and the optical output in the non-signal state is equivalent to (extinction ratio at the time of signal transmission + extinction ratio of the external modulation means 14).
  • the extinction ratio increases the margin of input light fluctuation at the receiver.
  • the extinction ratio B a between the optical output of the signal “1” and the optical output of the signal “0” is the extinction ratio determined by the LD 11 during signal transmission.
  • the size can be gradually increased, and the detection accuracy and the detection margin in the peak Z-point detection circuit can be improved.
  • FIG. 11 is a diagram illustrating a configuration of a second embodiment.
  • the transmission device 10b controls the monitor photo diode (hereinafter referred to as mPD) and the optical power of the optical signal of the LD 11, and when no signal is transmitted, the optical signal is transmitted until the next signal is transmitted.
  • optical power control means 120b for holding power information.
  • the same components as those in FIG. 1 are denoted by the same reference numerals and description thereof will be omitted.
  • the optical power control means 12 0 b is included in the drive control means 12, and the current-Z voltage conversion (hereinafter, I / V) 12-la, 12-l b, and the cono. 1 2 — 2 and APC (Au tomatic Power Control) means 1 2 1 power.
  • I / V 12-1 a converts the monitor current Im generated by monitoring the peak of the optical output of LD 11 with mPD to a voltage.
  • I / V 12-1 b is a reference current I ref (a current that becomes a reference when the optical power of the LD 11 becomes a peak) output from the LD driver 12 a. Convert to voltage.
  • comparators 1 2 and 2 compare these two voltages.
  • the APC means 121 performs the APC via the LD driver 12a based on the comparison result of the comparator 12_2 to variably control the optical power of the LD11.
  • the monitor current I m is controlled so that the value approaches the reference current I ref (to increase the optical power of the LD 11) and to increase the value of the modulation current I p.
  • the LD driver 12a is controlled so that the optical power of 11 becomes smaller) and the value of the modulation current Ip becomes smaller.
  • An external modulation control signal CNT is input to the APC means 122.
  • the external modulation control signal C NT is 0 N
  • the optical signal is not emitted, so that the APC information is held. That is, when no signal is transmitted, the previous optical power information is held until the next signal is transmitted.
  • the external modulation control signal CNT is 0FF, the above-described APC is performed.
  • FIG. 7 is a diagram showing a configuration when the APC means 122 is realized by an analog circuit.
  • the APC means 1 21a is composed of an APC section 1 2a-1 and an APC information holding section 1 2a_2.
  • the gate terminal of FETQ1 is connected to the output terminal of amplifier IC1, and the source terminal of FETQ1 is connected to the drain terminal of switching transistor SW1.
  • the gate terminal of the switching transistor SW 1 is connected to the output terminal of the inverter IC 2, and the switching transistor SW
  • the source terminal 1 is connected to the other input terminal of the amplifier IC1, one end of the capacitor C1, the drain terminal of the switching transistor SW2, and the terminal b of the three-terminal switch SW3. Connecting.
  • the external modulation control signal CNT is input to the input terminal of the IC2 and the gate terminal of the switching transistor SW2, and the external modulation is also used for the switching control of the three-terminal switch SW3.
  • the control signal CNT is used.
  • the source terminal of the switching transistor SW2 is connected to one input terminal of the amplifier IC3.
  • the drain terminal of the field effect transistor FETQ2 is connected to the current source IA2, the gate terminal of the FETQ2 is connected to the output terminal of the amplifier IC3, and the source terminal of the FETQ2 is connected to the amplifier IC3. Connect the other input terminal, terminal a of 3-terminal switch SW3, and one end of capacitor C2.
  • the other ends of the capacitors Cl and C2 are connected to GND, and the common terminal COM of the three-terminal switch SW3 is connected to the LD dry line 12a.
  • FIG. 8 is a diagram showing an equivalent circuit of the APC means 122a when transmitting a signal
  • FIG. 9 is a diagram showing an equivalent circuit of the APC means 121a when not transmitting a signal.
  • switch SW1 is at ⁇ N and switch SW2 is at OFF. It becomes such an equivalent circuit.
  • the switch SW 3 is connected to the terminal b.
  • the APC section 121 aa_1 operates, and the APC information holding section 122a-1 does not perform the holding operation.
  • the output information is retained by the capacity C1 and is used when switching from non-signal transmission to signal transmission.
  • the current source IA that is APCed through the amplifier IC 1 The current from 1 is transmitted to LD driver '12a through switch SW3.
  • the LD driver 12a controls the drive of the LD 11 using the current of the APC section 121a-1 power during signal transmission.
  • the APC information holding unit 12 1a-2 performs the APC information holding operation.
  • the output information is retained by the capacity C1 and is used when switching from signal transmission to non-signal transmission.
  • the current from the current source IA2, whose APC information is held and controlled through the amplifier IC3, is transmitted to the LD driver 12a via the switch SW3.
  • the LD driver 12a uses this current from the APC information storage unit 121a_2 at the start of switching from the time of no signal transmission to the time of the next signal transmission, and 11 Drive control of 1 is performed.
  • FIG. 10 is a diagram showing a configuration when the APC means 122 is realized by a digital circuit.
  • the APC means 1 2 1 b is composed of an up-Z down-counter 12-3 and a D / A converter 12-4.
  • the up-down count 1 2 — 3 indicates that the monitor current Im is smaller than the reference current I ref. If it is recognized from the output signal, it is counted up so that the monitor current Im approaches the reference current Iref (to increase the optical power of LD11), and the current Outputs the count value.
  • the D / A comparators 1 2-4 receive the digital up-count value, and use the LD driver 12 a to increase the modulation current I p. Outputs analog control signal.
  • the upper Z down counter 1 2 — 3 is adjusted so that the monitor current Im approaches the reference current I ref (LD (In order to reduce the optical power of 11), down-count and output the down-count value at that time.
  • LD In order to reduce the optical power of 11
  • the DZA converters 1 2 to 4 receive the digital down-count value and output an analog control signal to reduce the value of the modulation current I p with the LD driver 12 a. I do.
  • the external modulation control signal CNT is input to the UP Z down-counter 12-3, and when the external modulation control signal CNT is ON, the optical signal is not emitted and the counting operation is not performed. Stop and retain APC information. When the external modulation control signal CNT is 0FF, either the up operation or the down operation is performed.
  • FIG. 11 is a diagram showing the configuration of the third embodiment.
  • the optical transmission device 10c according to the third embodiment includes an optical power control means 120c for controlling an optical power by obtaining an average value from a monitor current and including the drive power control means 12c in the drive control means 12. It is.
  • the same components as those in FIG. 1 are denoted by the same reference numerals and description thereof will be omitted.
  • the optical power control means 120 c is calculated as follows: I ZV 1 2-1 c, average value detection means 1 2-5, up / down count 1 2-6, D
  • I / V12-1c converts the monitor current Ima generated by monitoring the optical output of LD11 with mPD into a voltage.
  • the average value detecting means 1 2-5 detects the average value during signal transmission from the monitor current I ma.
  • the D / A comparator 1 2 — 7 receives the digital up-count value and adjusts the LD driver 12 a so that the value of the modulation current I p increases. Outputs analog control signal.
  • the countdown is performed. , And output the down-count value.
  • the DZA converters 1 2 to 7 receive the digital down-count value and generate an analog control signal to reduce the modulation current I p with the LD driver 12 a. Output.
  • the external modulation control signal CNT is input to the UP Z down-counter 1 2 — 6, and when the external modulation control signal CNT is ⁇ N, the optical signal is not emitted and the count is not performed. Operation stops and APC information is retained. When the external modulation control signal CNT is OFF, either the up operation or the down operation is performed.
  • FIG. 12 is a diagram showing a circuit configuration of the average value detecting means 12-5. The connection relation of each element will be described.
  • the output terminal of the amplifier IC4 is connected to the diode D1 and the diode D2.
  • the other end of the resistor R 2 is connected to the node of the diode D 2 and one end of the resistor R 3.
  • the other end of resistor R3 is connected to the other end of resistor R5, one end of capacitor C3, one end of resistor R4, and one input terminal of amplifier IC5.
  • the other output terminal of the amplifier IC 5 is connected to the other end of the capacitor C 3, the other end of the resistor R 4, and the up-down counter 12-6. Then, a reference signal is input to the other input terminals of the amplifiers IC4 and IC5.
  • the feedback control of the optical power of the optical signal is performed based on the average value at the time of signal transmission, and the signal is transmitted when the signal is not transmitted.
  • the optical power information (APC information) up to the transmission of the signal is retained.
  • FIG. 13 is a diagram showing the configuration of the fourth embodiment.
  • the optical transmission device 10d according to the fourth embodiment is a case where the external modulation means 14 is controlled using an external signal EX instead of the external modulation control signal CNT.
  • EX instead of the external modulation control signal CNT.
  • the same components as those in FIG. 1 are denoted by the same reference numerals and description thereof will be omitted.
  • the external signal EX is a control signal that is input in parallel with the input signal, and is a signal that is enabled when the input signal is transmitted and disabled when the signal is not transmitted.
  • the external modulating means 14 can emit and non-emit an optical signal using the external signal Ex.
  • the fourth embodiment of the present invention can achieve the same effects as the first embodiment, and can further reduce the circuit scale.
  • FIG. 14 is a diagram showing the configuration of the fifth embodiment.
  • the optical transmission device 10e of the fifth embodiment controls the external modulation means 14 using the pulse signal P from the pulse signal generation means 16 instead of the external modulation control signal CNT. is there. Note that the same components as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted.
  • the pulse signal generating means 16 is a first pulse of the input signal, that is, a first pulse indicating the top of the input cell. When receiving a pulse signal, a pulse signal P equivalent to one cell length is generated.
  • the external modulating means 14 uses the pulse signal P to emit and non-emit an optical signal.
  • the fifth embodiment of the present invention can obtain the same effects as those of the first embodiment, and can further reduce the circuit scale.
  • the high-level signal detecting means 13b is provided and the low-level signal continuous detecting means 13a is reset.
  • the reset may be performed directly from the output signal of the fixed-length delay means 15 using the data of "1" without providing the level signal detection means 13b. Also, the detection of "1” is not performed by the electric stage, and the detection of "1” is performed using mPD with good response (this is used as high-level signal detection means). A reset may be performed.
  • the optical transmission apparatus of the present invention does not emit an optical signal by an external modulation means when a signal of a fixed length is not transmitted, and bias-drives an optical signal conversion means at the time of signal transmission.
  • an optical signal is emitted by an external modulating means. This makes it possible to secure a large extinction ratio during non-transmission of signals without emission delay.
  • the extinction ratio during signal transmission is determined by the optical signal conversion means, a large extinction ratio can be obtained, so that the detection accuracy at the receiving side is improved and the overall transmission characteristics are improved. This will be possible.

Abstract

La présente invention permet d'éliminer un retard d'émission lumineuse et de sécuriser un rapport élevé d'extinction à la fois durant une émission et une non émission de signal. Des moyens de transformation (11) de signal lumineux permettent de convertir un signal en signal lumineux. Des moyens de commande de pilotage (12) mettent en oeuvre une commande de pilotage polarisé des moyens de transformation (11) de signal lumineux. Des moyens de détection (13) de non émission détectent si un signal d'une certaine longueur va ou ne va pas être émis et sort un signal de commande de modulation externe (CNT) qui se trouve dans un état passant durant une non émission de signal et dans un état bloqué durant une émission de signal. Des moyens de modulation (14) externe n'émettent pas de signal lumineux lorsque le signal de commande de modulation externe (CNT) est dans un état passant et émettent un signal lumineux lorsque le CNT est dans l'état bloqué.
PCT/JP1998/004825 1998-10-23 1998-10-23 Dispositif d'emission optique WO2000025458A1 (fr)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007533275A (ja) * 2004-04-14 2007-11-15 フィニサー コーポレイション ネットワーク送受信機間の帯域外データ通信
JP2010283644A (ja) * 2009-06-05 2010-12-16 Nippon Telegr & Teleph Corp <Ntt> 光アクセス網、光通信方法および光加入者装置
JP2014138195A (ja) * 2013-01-15 2014-07-28 Nippon Telegr & Teleph Corp <Ntt> 波長可変バースト送信器
JPWO2016060134A1 (ja) * 2014-10-15 2017-04-27 株式会社フジクラ 光送信器、アクティブ光ケーブル、ｏｎｕ、及び光送信方法
JPWO2016060133A1 (ja) * 2014-10-15 2017-04-27 株式会社フジクラ 光送信器、アクティブ光ケーブル、及び光送信方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04346526A (ja) * 1991-05-24 1992-12-02 Nippon Telegr & Teleph Corp <Ntt> バースト光信号送信回路
JPH0983050A (ja) * 1995-09-13 1997-03-28 Fujitsu Ltd 半導体レーザの駆動方法、半導体レーザの駆動回路及び外部変調器

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04346526A (ja) * 1991-05-24 1992-12-02 Nippon Telegr & Teleph Corp <Ntt> バースト光信号送信回路
JPH0983050A (ja) * 1995-09-13 1997-03-28 Fujitsu Ltd 半導体レーザの駆動方法、半導体レーザの駆動回路及び外部変調器

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007533275A (ja) * 2004-04-14 2007-11-15 フィニサー コーポレイション ネットワーク送受信機間の帯域外データ通信
JP2010283644A (ja) * 2009-06-05 2010-12-16 Nippon Telegr & Teleph Corp <Ntt> 光アクセス網、光通信方法および光加入者装置
JP2014138195A (ja) * 2013-01-15 2014-07-28 Nippon Telegr & Teleph Corp <Ntt> 波長可変バースト送信器
JPWO2016060134A1 (ja) * 2014-10-15 2017-04-27 株式会社フジクラ 光送信器、アクティブ光ケーブル、ｏｎｕ、及び光送信方法
JPWO2016060133A1 (ja) * 2014-10-15 2017-04-27 株式会社フジクラ 光送信器、アクティブ光ケーブル、及び光送信方法
US10097278B2 (en) 2014-10-15 2018-10-09 Fujikura Ltd. Optical transmitter, active optical cable, and optical transmission method
US10122469B2 (en) 2014-10-15 2018-11-06 Fujikura Ltd. Optical transmitter, active optical cable, and optical transmission method

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