JPH039627A - Optical transmission equipment - Google Patents
Optical transmission equipmentInfo
- Publication number
- JPH039627A JPH039627A JP1144891A JP14489189A JPH039627A JP H039627 A JPH039627 A JP H039627A JP 1144891 A JP1144891 A JP 1144891A JP 14489189 A JP14489189 A JP 14489189A JP H039627 A JPH039627 A JP H039627A
- Authority
- JP
- Japan
- Prior art keywords
- optical signal
- output signal
- pass filter
- output
- modulator
- 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
- 230000005540 biological transmission Effects 0.000 title claims abstract description 27
- 230000003287 optical effect Effects 0.000 title claims abstract description 25
- 239000000835 fiber Substances 0.000 claims description 6
- 230000010355 oscillation Effects 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000013598 vector Substances 0.000 description 1
Landscapes
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Optical Communication System (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は光伝送装置、特に加入者伝送系は使用される光
伝送装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical transmission device, and particularly to an optical transmission device used in a subscriber transmission system.
加入者伝送系の従来の光伝送では、価格の安い短波長帯
のレーザダイオードと長波長用光ファイバーとの組合せ
が、利用されている。送信時には、送信符号に従ってレ
ーザダイオードの発光をオンオフしている。In conventional optical transmission for subscriber transmission systems, a combination of an inexpensive short wavelength band laser diode and a long wavelength optical fiber is used. During transmission, the laser diode's light emission is turned on and off according to the transmission code.
従来の光伝送装置では、送信側のレーザダイオードの出
力光の発振周波数がランダムに微妙に変化し、光ファイ
バーの伝送特性を相まって、送信符号の伝搬速度に影響
を与えるので、受信側で全くランダム波な波形ずれや波
形歪みを発生させる。In conventional optical transmission equipment, the oscillation frequency of the output light of the laser diode on the transmitting side changes slightly at random, which, together with the transmission characteristics of the optical fiber, affects the propagation speed of the transmitted code, so the receiving side receives completely random waves. This causes waveform deviation and waveform distortion.
この結果、波形歪み等の影響が顕著にならない範囲で使
用するよう、伝送距離や伝送速度に大きな制限が課せら
れるという問題点がある。As a result, there is a problem in that large restrictions are imposed on transmission distance and transmission speed so that the transmission distance and transmission speed are used within a range where the influence of waveform distortion etc. does not become noticeable.
本発明の目的は、上述のランダムな発振周波数の変化を
定常化し、これにより発生する定常的な波形歪みを受信
側で波形等化することにより、伝送系の伝送距離、伝送
速度を従来よりも改善することである。The purpose of the present invention is to make the above-mentioned random oscillation frequency change steady, and to equalize the steady waveform distortion that occurs due to this on the receiving side, thereby increasing the transmission distance and transmission speed of the transmission system compared to conventional methods. It's about improving.
本発明の装置は、変調発光用のレーザダイオードをもつ
光信号発振器と、発振正弦波の輝線性を弱めるため前記
レーザダイオードに周波数変調をかける第１の変調装置
と、前記レーザダイオードの前記周波数変調された発光
を送信符号に従ってオンオフする第２の変調装置と、前
記光信号発振器の出力光をファイバーケーブルの入力端
に接続する接続装置と、前記ファイバーケーブルの出力
端で光信号を検出する光信号検出器と、該光信号検出器
の出力信号から前記第１の変調装置により加えられた変
調成分を平滑するための低減ろ波器と、該低減）戸波器
の出力信号に含まれている符号間干渉成分を除去するた
めの波形等化器とを備えている。The device of the present invention includes an optical signal oscillator having a laser diode for modulated light emission, a first modulator that applies frequency modulation to the laser diode in order to weaken the bright line property of the oscillated sine wave, and a second modulating device that turns on and off the emitted light according to a transmission code; a connecting device that connects the output light of the optical signal oscillator to the input end of a fiber cable; and an optical signal that detects the optical signal at the output end of the fiber cable. a detector; a reduction filter for smoothing a modulation component added by the first modulation device from the output signal of the optical signal detector; and a code included in the output signal of the filter. and a waveform equalizer for removing interfering components.
次に本発明に付いて図面を参照して詳細に説明する。 Next, the present invention will be explained in detail with reference to the drawings.
第１図は本発明の一実施例のブロック図である。FIG. 1 is a block diagram of one embodiment of the present invention.
送信符号は送信側の入力端子１００から入力される。光
信号発振器１は、通常、レーダダイオードが用いられ、
第１の変調装置２でＦＭ変調されてその発振出力光の輝
線性が弱められ、連続的な出力２ベクトルを持つ様にな
る。第２の変調装置３は、入力端子１００へ加えられる
送信符号に応じて、光信号発振器１の出力光をオンオフ
する。この発振出力光は、接続装置４からファイバーケ
ーブル８へ送出される。受信側では、光信号を検出する
光信号検出器５の出力信号は、低域ろ波器６へ送られて
、変調装置２で付加された高速なＦＭ変調成分を除去さ
れる。低減ろ波器６の出力信号は、第２図（ｂ）に示し
た様な基本発振モードと、第２図（ａ）および（Ｃ）に
示した様な複数の不要発振モードとで伝送された波形が
安定的に加算され、第３図に示すような波形となる。こ
の結果として生じる波形歪みを波形等化器７で除去する
。The transmission code is input from the input terminal 100 on the transmission side. The optical signal oscillator 1 usually uses a radar diode,
The first modulator 2 performs FM modulation to weaken the bright line property of the oscillated output light, so that it has two continuous output vectors. The second modulator 3 turns on and off the output light of the optical signal oscillator 1 according to the transmission code applied to the input terminal 100. This oscillated output light is sent from the connection device 4 to the fiber cable 8. On the receiving side, the output signal of the optical signal detector 5 that detects the optical signal is sent to a low-pass filter 6, where the high-speed FM modulation component added by the modulator 2 is removed. The output signal of the reduction filter 6 is transmitted in a basic oscillation mode as shown in FIG. 2(b) and in a plurality of unnecessary oscillation modes as shown in FIG. 2(a) and (C). The waveforms obtained are added stably, resulting in a waveform as shown in FIG. The resulting waveform distortion is removed by a waveform equalizer 7.
波形等化器としては、タップ付遅延線と乗算器と加算器
とから成るトランスバーサル型の等化器を使用すれば良
い、これにより、出力端子２００には、安定的に波形歪
みを除去され再生された送信符号が得られる。As the waveform equalizer, a transversal equalizer consisting of a tapped delay line, a multiplier, and an adder may be used. This allows the output terminal 200 to have waveform distortions stably removed. A regenerated transmission code is obtained.
本発明によれば、従来の光発振器の出力光のランダムな
発振周波数ずれに起因する伝送距離や伝送速度の制限を
大幅に緩和することができる。According to the present invention, limitations on transmission distance and transmission speed caused by random oscillation frequency shifts of output light of conventional optical oscillators can be significantly alleviated.
第１図は本発明の一実施例のブロック図、第２図（ａ）
〜（Ｃ）、第３図は本発明の実施例での波形歪みを例示
する信号波形図である。
１・・・光信号発振器、２，３・・・変調装置、４・・
・接続装置、５・・・光信号検出器、６・・・低域ろ波
器、７・・・波形等化器、８・・・ファイバーケーブル
。Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2(a)
-(C) and FIG. 3 are signal waveform diagrams illustrating waveform distortion in the embodiment of the present invention. 1... Optical signal oscillator, 2, 3... Modulation device, 4...
- Connection device, 5... Optical signal detector, 6... Low pass filter, 7... Waveform equalizer, 8... Fiber cable.
Claims (1)
発振正弦波の輝線性を弱めるため前記レーザダイオード
に周波数変調をかける第１の変調装置と、前記レーザダ
イオードの前記周波数変調された発光を送信符号に従っ
てオンオフする第２の変調装置と、前記光信号発振器の
出力光をファイバーケーブルの入力端に接続する接続装
置と、前記ファイバーケーブルの出力端で光信号を検出
する光信号検出器と、該光信号検出器の出力信号から前
記第１の変調装置により加えられた変調成分を平滑する
ための低減濾波器と、該低減濾波器の出力信号に含まれ
ている符号間干渉成分を除去するための波形等化器とを
備えていることを特徴とする光伝送装置。an optical signal oscillator having a laser diode for modulated light emission;
a first modulator that applies frequency modulation to the laser diode in order to weaken the bright line property of the oscillating sine wave; a second modulator that turns on and off the frequency-modulated light emission of the laser diode according to a transmission code; a connecting device that connects the output light of the oscillator to the input end of the fiber cable; an optical signal detector that detects the optical signal at the output end of the fiber cable; and the first modulating device that converts the output signal of the optical signal detector into the output signal. and a waveform equalizer for removing intersymbol interference components contained in the output signal of the reduction filter. optical transmission equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1144891A JPH039627A (en) | 1989-06-06 | 1989-06-06 | Optical transmission equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1144891A JPH039627A (en) | 1989-06-06 | 1989-06-06 | Optical transmission equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH039627A true JPH039627A (en) | 1991-01-17 |
Family
ID=15372755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1144891A Pending JPH039627A (en) | 1989-06-06 | 1989-06-06 | Optical transmission equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH039627A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6271333B1 (en) | 1999-04-22 | 2001-08-07 | The Yokohama Rubber Co., Ltd. | One-part moisture curable composition |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS583431A (en) * | 1981-06-30 | 1983-01-10 | Nec Corp | Optical transmitter and receiver |
-
1989
- 1989-06-06 JP JP1144891A patent/JPH039627A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS583431A (en) * | 1981-06-30 | 1983-01-10 | Nec Corp | Optical transmitter and receiver |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6271333B1 (en) | 1999-04-22 | 2001-08-07 | The Yokohama Rubber Co., Ltd. | One-part moisture curable composition |
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