JPH0964904A - Optical output control system in pds transmission system - Google Patents
Optical output control system in pds transmission systemInfo
- Publication number
- JPH0964904A JPH0964904A JP7242502A JP24250295A JPH0964904A JP H0964904 A JPH0964904 A JP H0964904A JP 7242502 A JP7242502 A JP 7242502A JP 24250295 A JP24250295 A JP 24250295A JP H0964904 A JPH0964904 A JP H0964904A
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- output
- optical
- circuit
- intra
- phase control
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Abstract
Description
【０００１】[0001]
【発明が属する技術分野】本発明はＰＤＳ（パッシブダ
ブルスター）伝送方式に関し、特に局内装置と複数の加
入者装置との間の伝送距離が異なる場合に、局内装置の
光受信部分での光入力を均一化するために、加入者装置
の光出力を制御する方式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PDS (passive double star) transmission system, and in particular, when a transmission distance between an intra-station device and a plurality of subscriber devices is different, an optical input at an optical receiving portion of the intra-station device. The present invention relates to a method of controlling an optical output of a subscriber device in order to equalize the above.
【０００２】[0002]
【従来の技術】各装置間の信号を衝突させることなく伝
送させるように制御する従来の方法として、予め各加入
者装置に対して送信バースト信号の帯域を割り当ててお
き、加入者装置において情報の送信を必要とする時以外
の時点においては、局内装置からの制御により加入者装
置からの送信を停止し、他の加入者装置の利用時間を増
大させる多方向多重通信方式（ＴＤＭＡ：Time Divisio
n Multiple Access）がある（多方向多重通信方式につ
いては例えば特開昭６１−２４３３８号公報参照）。2. Description of the Related Art As a conventional method for controlling transmission of signals between respective devices without collision, a band of a transmission burst signal is assigned to each of the subscriber devices in advance, and the information of each subscriber device is transmitted. At a time other than when transmission is required, a multidirectional communication system (TDMA: Time Divisio) that stops transmission from a subscriber device under the control of an in-station device and increases the usage time of another subscriber device.
n Multiple Access) (see, for example, Japanese Patent Laid-Open No. 61-24338 for a multi-directional multiple communication system).
【０００３】従来のＴＤＭＡ方式光伝送システムにおい
ては、局内装置と複数の加入者装置との間で双方向通信
を行う場合、各加入者装置と局内装置との間の距離は一
定ではない。In the conventional TDMA optical transmission system, when two-way communication is performed between an in-station device and a plurality of subscriber devices, the distance between each subscriber device and the in-station device is not constant.
【０００４】このように各加入者装置と局内装置との間
の各伝送路の距離が様々である場合にも、各加入者装置
の光出力は一定の出力で発光しているため、例えば、各
加入者装置（端末装置）よりスターカプラを介して局内
装置（親装置）が信号を受信する場合、受信データの振
幅が定まらず光受信回路が複雑になるという問題を有す
る。この問題を解消するため、例えば特開平５−２７６
１４４号公報には、局内装置の光受信部分への光入力を
可能な限り均一にすることを目的として、伝送路の距離
差を考慮し局内装置と加入者装置との間の各伝送路に配
置された光可変減衰器の減衰量を各距離差に従って自動
的に設定制御し、局内装置の光受信部に入力される光信
号を均一化させるようにしたＴＤＭＡ方式光伝送システ
ムが提案されている。Even when the distance of each transmission line between each subscriber device and the intra-station device varies as described above, the optical output of each subscriber device emits light at a constant output. When the intra-station device (parent device) receives a signal from each subscriber device (terminal device) via the star coupler, the amplitude of the received data is not fixed and the optical receiving circuit becomes complicated. In order to solve this problem, for example, Japanese Patent Laid-Open No. 5-276
In Japanese Patent Publication No. 144, for the purpose of making the optical input to the optical receiving portion of the intra-station device as uniform as possible, the transmission line between the intra-station device and the subscriber device is considered in consideration of the distance difference between the transmission lines. A TDMA optical transmission system has been proposed in which the attenuation amount of an arranged optical variable attenuator is automatically set and controlled according to each distance difference, and an optical signal input to an optical receiving unit of an in-station device is made uniform. There is.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、前記特
開平５−２７６１４４号公報に記載された従来のＴＤＭ
Ａ方式光伝送システムでは、本来、加入者線伝送路の数
を削減し経済的な光加入者システムを構築することを目
的とするＰＤＳ伝送方式において、伝送路の途中に光可
変減衰器を配置することが必要とされ、このためシステ
ム構築費用が高騰するという問題を有する。However, the conventional TDM described in the above-mentioned Japanese Patent Laid-Open No. 5-276144.
In the A system optical transmission system, an optical variable attenuator is arranged in the middle of the transmission line in the PDS transmission system which is originally intended to reduce the number of subscriber line transmission lines and construct an economical optical subscriber system. Therefore, there is a problem that the system construction cost rises.
【０００６】また、従来光ファイバ等の伝送路しか敷設
されていなかった区間に、保守対象となり得る光可変減
衰器を新たに配置するため、保守者の負担が増加すると
いう問題を有する。Further, since a variable optical attenuator, which can be a maintenance target, is newly arranged in a section where only a transmission line such as an optical fiber has been conventionally laid, there is a problem that a burden on a maintenance person increases.
【０００７】従って、本発明は、上記従来技術の問題点
を解消し、ＰＤＳ伝送方式に好適に適用可能とされ、局
内装置の光受信部分での光入力レベル変動を抑えること
を可能とする光出力制御方式を提供することを目的とす
る。Therefore, the present invention solves the above-mentioned problems of the prior art, can be suitably applied to the PDS transmission system, and can suppress the fluctuation of the optical input level in the optical receiving portion of the intra-station device. The purpose is to provide an output control method.
【０００８】[0008]
【課題を解決するための手段】前記目的を達成するた
め、本発明は、局内装置に接続される伝送路から光分岐
を介して複数本の伝送路に分岐し各伝送路の終端に接続
された複数の加入者装置と前記局内装置との双方向通信
を行う伝送方式において、前記加入者装置から前記局内
装置へ出力される光信号が、前記光分岐で合成される時
に衝突することを互いに防ぐための位相制御情報に基づ
き、前記局内装置と前記加入者装置との間の伝送路の距
離に応じた光出力に設定されて出力されることを特徴と
する光出力制御方式を提供する。In order to achieve the above-mentioned object, the present invention is to branch from a transmission line connected to an in-station device into a plurality of transmission lines via an optical branch and to connect to the end of each transmission line. In a transmission method for performing bidirectional communication between a plurality of subscriber devices and the intra-station device, the optical signals output from the subscriber device to the intra-station device may collide with each other when they are combined in the optical branch. There is provided an optical output control method characterized in that an optical output is set and output according to a distance of a transmission path between the intra-station device and the subscriber device based on phase control information for preventing.
【０００９】本発明は、好ましくは、局内装置と複数の
加入者装置が、伝送路に配置されたスターカプラを介し
て双方向通信を行う構成とされるパッシブダブルスター
（ＰＤＳ）伝送方式において、前記加入者装置をｎ台
（ｎは自然数）接続することが可能な局内装置が、伝送
路と接続している第１の波長多重分離器と、前記第１の
波長多重分離器の出力を入力とする第１の光−電気変換
回路（「Ｏ−Ｅ変換回路」という）と、前記第１のＯ−
Ｅ変換回路の出力を入力とする距離測定回路と、前記距
離測定回路の出力を入力とする位相制御情報生成回路
と、局内装置主信号と前記位相制御情報生成回路の出力
を入力とする挿入回路と、前記挿入回路の出力を入力と
し、その出力が前記第１の波長多重分離器に接続される
第１の電気−光変換回路（「Ｅ−Ｏ変換回路」という）
と、を備え、前記局内装置と伝送路で接続される光分岐
と、前記光分岐と伝送路で接続される加入者装置が、伝
送路と接続している第２の波長多重分離器と、前記第２
の波長多重分離器の出力を入力とする第２のＯ−Ｅ変換
回路と、前記第２のＯ−Ｅ変換回路の出力を入力とする
位相制御情報抽出回路と、前記位相制御情報抽出回路の
出力と加入者装置主信号を入力とする出力位相制御回路
と、前記位相制御情報抽出回路の出力を入力とする光出
力制御回路と、前記出力位相制御回路の出力と前記光出
力制御回路の出力とを入力とし、その出力が前記第２の
波長多重分離器に接続される第２のＥ−Ｏ変換回路と、
を備えることを特徴とするＰＤＳ伝送方式における光出
力制御方式を提供する。The present invention is preferably a passive double star (PDS) transmission system in which an intra-station device and a plurality of subscriber devices perform bidirectional communication via a star coupler arranged in a transmission line, An intra-station device capable of connecting n subscriber devices (n is a natural number) inputs a first wavelength demultiplexer connected to a transmission line and an output of the first wavelength demultiplexer. And a first opto-electric conversion circuit (referred to as “OE conversion circuit”),
A distance measuring circuit having an output of the E conversion circuit as an input, a phase control information generating circuit having an output of the distance measuring circuit as an input, and an insertion circuit having an internal device main signal and an output of the phase control information generating circuit as an input And a first electro-optical conversion circuit (referred to as an "EO conversion circuit") having the output of the insertion circuit as an input and having its output connected to the first wavelength demultiplexer.
And an optical branch connected to the intra-station device via a transmission path, and a second wavelength demultiplexer in which the subscriber device connected to the optical branch via the transmission path is connected to the transmission path, The second
Of the second O-E conversion circuit having the output of the wavelength demultiplexer as an input, the phase control information extraction circuit having the output of the second O-E conversion circuit as an input, and the phase control information extraction circuit An output phase control circuit having an output and a subscriber unit main signal as an input, an optical output control circuit having an output of the phase control information extraction circuit as an input, an output of the output phase control circuit and an output of the optical output control circuit A second EO conversion circuit whose input is and whose output is connected to the second wavelength demultiplexer;
An optical output control method in a PDS transmission method is provided.
【００１０】本発明によれば、位相制御情報に基づき加
入者装置から出力される光信号の光出力を制御するよう
にしたことにより、局内装置の光受信部分の光入力レベ
ルの均一化を達成している。特に、本発明は、前記従来
例と相違して、伝送路に光可変減衰器を新たに敷設する
ことを不要とし、保守負担の軽減、及びコストの低減を
達成しながら、局内装置における受信光入力のレベル変
動による光受信特性の劣化を抑止するものである。According to the present invention, the optical output of the optical signal output from the subscriber unit is controlled based on the phase control information, so that the optical input level of the optical receiving portion of the intra-station device is made uniform. are doing. In particular, the present invention, unlike the above-mentioned conventional example, eliminates the need for newly laying an optical variable attenuator on the transmission path, reduces the maintenance load, and reduces the cost, while at the same time receiving optical signals at the station device. This is to prevent deterioration of optical reception characteristics due to input level fluctuations.
【００１１】[0011]
【発明の実施の形態】本発明の実施の形態を図面を参照
して以下に説明する。図１は本発明の一実施形態の構成
を示すブロック図である。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention.
【００１２】図１を参照して、本実施形態に係る伝送方
式における光出力制御方式は、局内装置１と複数の加入
者装置３が、伝送路に配置されたスターカプラ（光分
岐）２を介して双方向通信を行うパッシブダブルスター
（ＰＤＳ）伝送方式に従うものである。なお、パッシブ
ダブルスター（ＰＤＳ）伝送方式においては、受動型
（パッシブ）の光分岐２を用いて、スター状に複数の加
入者装置３に分岐すると共に、局内においても複数の局
内装置１が光分岐２からスター状に分岐接続されてなる
（すなわちダブルスター方式）。Referring to FIG. 1, in the optical output control system in the transmission system according to the present embodiment, an intra-station device 1 and a plurality of subscriber devices 3 have a star coupler (optical branch) 2 arranged in a transmission line. It is based on a passive double star (PDS) transmission method in which two-way communication is performed via the same. In addition, in the passive double star (PDS) transmission system, a passive optical branch 2 is used to branch into a plurality of subscriber units 3 in a star shape, and a plurality of intra-station devices 1 are also used in a station. It is branched and connected in a star shape from the branch 2 (that is, a double star system).
【００１３】加入者装置３をｎ個（ｎは自然数）接続す
ることが可能な局内装置１は、伝送路と接続している第
１の波長多重分離器１０と、第１の波長多重分離器１０
の出力を入力とする第１の光−電気変換回路（「Ｏ−Ｅ
変換回路」という）１１と、第１のＯ−Ｅ変換回路１１
の出力を入力とする距離測定回路１２と、距離測定回路
１２の出力を入力とする位相制御情報生成回路１３と、
局内装置主信号１００と位相制御情報生成回路１３の出
力とを入力とする挿入回路１４と、挿入回路１４の出力
を入力とし、出力が第１の波長多重分離器１０に接続さ
れる第１の電気−光変換回路（「Ｅ−Ｏ変換回路」とい
う）１５と、を備えている。The intra-station device 1 capable of connecting n (n is a natural number) subscriber devices 3 is a first wavelength demultiplexer 10 and a first wavelength demultiplexer 10 connected to a transmission line. 10
First optical-electrical conversion circuit (“O-E
"Conversion circuit") 11 and the first OE conversion circuit 11
A distance measurement circuit 12 that receives the output of the distance measurement circuit 12 as an input, a phase control information generation circuit 13 that receives the output of the distance measurement circuit 12 as an input,
The inserting circuit 14 that receives the intra-station device main signal 100 and the output of the phase control information generating circuit 13, and the first input that receives the output of the inserting circuit 14 and whose output is connected to the first wavelength demultiplexer 10. The electro-optical conversion circuit (hereinafter referred to as “EO conversion circuit”) 15 is provided.
【００１４】局内装置１と伝送路を介して接続された光
分岐２から各伝送路を介して接続される加入者装置３
は、伝送路と接続している第２の波長多重分離器３１
と、第２の波長多重分離器３１の出力を入力とする第２
のＯ−Ｅ変換回路３２と、第２のＯ−Ｅ変換回路３２の
出力を入力とする位相制御情報抽出回路３３と、位相制
御情報抽出回路３３の出力と加入者装置主信号３００を
入力とする出力位相制御回路３４と、位相制御情報抽出
回路３３の出力を入力とする光出力制御回路３５と、出
力位相制御回路３４の出力と光出力制御回路３５の出力
とを入力とし、出力が第２の波長多重分離器３１に接続
される第２のＥ−Ｏ変換回路３６と、を備えている。A subscriber unit 3 connected via each transmission line from an optical branch 2 connected to the intra-station device 1 via a transmission line.
Is the second wavelength demultiplexer 31 connected to the transmission line.
And a second wavelength demultiplexer 31 that receives the output of the second
O-E conversion circuit 32, a phase control information extraction circuit 33 that receives the output of the second O-E conversion circuit 32, an output of the phase control information extraction circuit 33, and a subscriber unit main signal 300. Output phase control circuit 34, an optical output control circuit 35 that receives the output of the phase control information extraction circuit 33 as an input, an output of the output phase control circuit 34 and an output of the optical output control circuit 35 as inputs, and the output is And a second E-O conversion circuit 36 connected to the second wavelength demultiplexer 31.
【００１５】次に、本実施形態の動作を説明する。Next, the operation of this embodiment will be described.
【００１６】局内装置１と加入者装置３との間の距離
は、通常の場合、一定ではないため、局内装置１は、加
入者装置３との伝送路の距離を認識するために伝送遅延
を測定する。Since the distance between the intra-station device 1 and the subscriber device 3 is not constant in a normal case, the intra-station device 1 recognizes the transmission path distance from the subscriber device 3 and therefore a transmission delay is caused. taking measurement.
【００１７】伝送遅延の測定において、局内装置１から
の距離測定要求に対する加入者装置３からの応答が光分
岐２を介して第１の波長多重分離器１０に入力される。
第１のＯ−Ｅ変換回路１１は、第１の波長多重分離器１
０の出力を入力し、入力した光信号を電気信号に変換し
て出力する。In measuring the transmission delay, the response from the subscriber unit 3 to the distance measurement request from the intra-station device 1 is input to the first wavelength demultiplexer 10 via the optical branch 2.
The first O-E conversion circuit 11 includes the first wavelength demultiplexer 1
The output of 0 is input, and the input optical signal is converted into an electrical signal and output.
【００１８】第１のＯ−Ｅ変換回路１１の出力を入力す
る距離測定回路１２では、距離測定要求に対する加入者
装置３からの応答の伝送遅延を認識することによって、
局内装置１と加入者装置３との間の伝送路の距離を知る
ことができる。The distance measuring circuit 12, which receives the output of the first OE conversion circuit 11, recognizes the transmission delay of the response from the subscriber unit 3 to the distance measuring request.
It is possible to know the distance of the transmission path between the intra-station device 1 and the subscriber device 3.
【００１９】そして、位相制御情報生成回路１３は、距
離測定回路１２の出力（伝送路の距離情報）を入力し、
各加入者装置３から局内装置１に対して出力された信号
が光分岐２で合成される際に互いに衝突しないように、
加入者装置３毎に出力位相を制御するための位相制御情
報を生成する。Then, the phase control information generating circuit 13 inputs the output (distance information of the transmission path) of the distance measuring circuit 12,
In order that the signals output from each subscriber device 3 to the intra-station device 1 do not collide with each other when they are combined in the optical branch 2,
Phase control information for controlling the output phase is generated for each subscriber device 3.
【００２０】挿入回路１４は、位相制御情報生成回路１
３の出力（位相制御情報）と局内装置主信号１００とを
入力し、主信号に位相制御情報を挿入して出力する。The inserting circuit 14 is the phase control information generating circuit 1
The output of 3 (phase control information) and the intra-station device main signal 100 are input, and the phase control information is inserted into the main signal and output.
【００２１】第１のＥ−Ｏ変換回路１５は、挿入回路１
４の出力信号（電気信号）を入力し、入力した電気信号
を光信号に変換して出力する。The first EO conversion circuit 15 includes the insertion circuit 1
The output signal (electrical signal) 4 is input, and the input electrical signal is converted into an optical signal and output.
【００２２】第１の波長多重分離器１０は、第１のＥ−
Ｏ変換回路１５の出力を入力して波長多重を行い伝送路
に対して出力する。The first wavelength demultiplexer 10 has a first E-
The output of the O conversion circuit 15 is input, wavelength division multiplexing is performed, and the result is output to the transmission line.
【００２３】局内装置１と伝送路を介して接続されてい
る光分岐２は、局内装置１から出力された光信号を分岐
し加入者装置３側の伝送路に対して出力する。The optical branch 2 connected to the intra-station device 1 via the transmission path branches the optical signal output from the intra-station apparatus 1 and outputs it to the transmission path on the side of the subscriber device 3.
【００２４】加入者装置３では、第２の波長多重分離器
３１が伝送路からの信号を入力し、波長分離して第２の
Ｏ−Ｅ変換回路３２に対して出力する。In the subscriber unit 3, the second wavelength demultiplexer 31 inputs the signal from the transmission line, demultiplexes the wavelength, and outputs it to the second OE conversion circuit 32.
【００２５】位相制御情報抽出回路３３は、第２のＯ−
Ｅ変換回路３２の出力を入力し、局内装置１から送信さ
れてきた位相制御情報を抽出して出力する。The phase control information extraction circuit 33 uses the second O-
The output of the E conversion circuit 32 is input, and the phase control information transmitted from the intra-station device 1 is extracted and output.
【００２６】出力位相制御回路３４は、位相制御情報抽
出回路３３の出力と加入者装置主信号３００とを入力
し、局内装置１に対して出力する信号の位相を、抽出し
た位相制御情報に従いその遅延を調整して出力する。そ
の際、局内装置１に対して出力する信号の位相（出力位
相）は、局内装置１と加入者装置３の距離が遠い場合に
は遅延を小さく設定し、近い場合は遅延を大きく設定す
る。The output phase control circuit 34 receives the output of the phase control information extraction circuit 33 and the subscriber unit main signal 300 and outputs the phase of the signal output to the intra-station device 1 according to the extracted phase control information. Adjust the delay and output. At this time, the phase (output phase) of the signal output to the in-station device 1 is set to a small delay when the distance between the in-station device 1 and the subscriber device 3 is long, and set to a large delay when the distance is short.
【００２７】また、光出力制御回路３５は、位相制御情
報抽出回路３３の出力を入力し、抽出された位相制御情
報に従って光出力を制御する信号を第２のＥ−Ｏ変換回
路３６に対して出力する。光出力の制御は、局内装置１
と加入者装置３の距離が遠い場合は光出力（パワー）が
大きくなるように設定し、近い場合は光出力（パワー）
が小さくなるように設定する。局内装置１と加入者装置
３との間の伝送路の距離と光出力との関係は、例えば図
２に示すような関係に設定される。Further, the optical output control circuit 35 inputs the output of the phase control information extraction circuit 33 and outputs a signal for controlling the optical output according to the extracted phase control information to the second EO conversion circuit 36. Output. The optical output is controlled by the intra-station device 1
When the distance between the subscriber unit 3 and the subscriber unit 3 is long, the optical output (power) is set to be large, and when the distance is short, the optical output (power) is set.
Is set to be small. The relationship between the transmission line distance between the intra-station device 1 and the subscriber device 3 and the optical output is set to the relationship shown in FIG. 2, for example.
【００２８】第２のＥ−Ｏ変換回路３６は、出力位相制
御回路３４の出力と、光出力制御回路３５の出力とを入
力し、出力位相制御回路３４から出力された電気信号を
光信号に変換するが、その際、光出力を光出力制御回路
３５からの出力信号で制御する。The second EO conversion circuit 36 inputs the output of the output phase control circuit 34 and the output of the optical output control circuit 35, and converts the electric signal output from the output phase control circuit 34 into an optical signal. At the time of conversion, the optical output is controlled by the output signal from the optical output control circuit 35.
【００２９】第２の波長多重分離器３１は、第２のＥ−
Ｏ変換回路３６の出力を入力し、波長多重を行い、伝送
路に対して出力する。The second wavelength demultiplexer 31 has a second E-
The output of the O conversion circuit 36 is input, wavelength division multiplexing is performed, and the result is output to the transmission path.
【００３０】[0030]
【発明の効果】以上説明したように、本発明は、加入者
装置から局内装置へ出力する信号の衝突を防ぐための位
相制御情報を、加入者装置の光出力制御にも用いるよう
にしたことにより、局内装置の光受信部分における光入
力レベルを前記従来例よりも均一化することを可能とす
るという効果を有する。このため、本発明によれば、前
記従来例のように、伝送路に光可変減衰器を新たに敷設
することを不要とし、保守負担を軽減を達成し、局内装
置における受信光入力のレベル変動による光受信特性の
劣化を軽減させることができるという効果を有する。As described above, according to the present invention, the phase control information for preventing the collision of the signal output from the subscriber unit to the intra-station unit is also used for the optical output control of the subscriber unit. As a result, there is an effect that it is possible to make the optical input level in the optical receiving portion of the intra-station device more uniform than in the conventional example. Therefore, according to the present invention, it is not necessary to newly install an optical variable attenuator in the transmission line as in the conventional example, the maintenance load is reduced, and the level fluctuation of the received optical input in the in-station device is achieved. This has the effect of reducing the deterioration of the optical reception characteristics due to.
【図１】本発明の一実施形態の構成を示すブロック図で
ある。FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.
【図２】伝送距離と光出力制御の関係を示す図である。FIG. 2 is a diagram showing a relationship between transmission distance and optical output control.
１ 局内装置 ２ 光分岐 ３ 加入者装置 １０ 第１の波長多重分離器 １１ 第１のＯ−Ｅ変換回路 １２ 距離測定回路 １３ 位相制御情報生成回路 １４ 挿入回路 １５ 第１のＥ−Ｏ変換回路 ３１ 第２の波長多重分離器 ３２ 第２のＯ−Ｅ変換回路 ３３ 位相制御情報抽出回路 ３４ 出力位相制御回路 ３５ 光出力制御回路 ３６ 第２のＥ−Ｏ変換回路 １００ 局内装置主信号 ３００ 加入者装置主信号 DESCRIPTION OF SYMBOLS 1 Intra-station apparatus 2 Optical branching 3 Subscriber apparatus 10 1st wavelength demultiplexer 11 1st OE conversion circuit 12 Distance measurement circuit 13 Phase control information generation circuit 14 Insertion circuit 15 1st EO conversion circuit 31 Second wavelength demultiplexer 32 Second OE conversion circuit 33 Phase control information extraction circuit 34 Output phase control circuit 35 Optical output control circuit 36 Second EO conversion circuit 100 In-station device main signal 300 Subscriber device Main signal
Claims (4)
介して複数本の伝送路に分岐し各伝送路の終端に接続さ
れた複数の加入者装置と前記局内装置との双方向通信を
行う伝送方式において、 前記加入者装置から前記局内装置へ出力される光信号
が、前記光分岐で合成される時に衝突することを互いに
防ぐための位相制御情報に基づき、前記局内装置と前記
加入者装置との間の伝送路の距離に応じた光出力に設定
されて出力されることを特徴とする光出力制御方式。1. A two-way communication between a plurality of subscriber devices branching from a transmission line connected to an intra-station device to a plurality of transmission lines via an optical branch and connected to the end of each transmission line, and the intra-station device. In the transmission method for performing the above-mentioned, the optical signal output from the subscriber unit to the intra-station device is based on the phase control information for preventing the optical signals from colliding with each other when they are combined in the optical branch, based on the phase control information. The optical output control method is characterized in that the optical output is set and output according to the distance of the transmission path to the user device.
れる出力信号が、前記局内装置と前記加入者装置との間
の伝送路の距離に応じて位相遅延されるように制御され
ることを特徴とする請求項１記載の光出力制御方式。2. An output signal output from the subscriber unit to the intra-station device is controlled so as to be phase-delayed according to a distance of a transmission path between the intra-station unit and the subscriber unit. The optical output control system according to claim 1, wherein:
された、前記局内装置と前記加入者装置との間の伝送路
の距離に対応する位相制御情報を抽出する手段と、前記
抽出した位相制御情報から前記局内装置と前記加入者装
置との間の伝送路の距離に応じて前記出力信号の位相及
び前記光出力を制御する手段と、を備えたことを特徴と
する請求項１又は２記載の光出力制御方式。3. The means for the subscriber unit to extract the phase control information transmitted from the intra-station device and corresponding to the distance of the transmission path between the intra-station device and the subscriber unit, and the extracted means. 2. A means for controlling the phase of the output signal and the optical output according to the distance of the transmission line between the intra-station device and the subscriber device from the phase control information. 2. The light output control method described in 2.
配置されたスターカプラを介して双方向通信を行う構成
とされるパッシブダブルスター（ＰＤＳ）伝送方式にお
いて、 前記加入者装置をｎ台（ｎは自然数）接続することが可
能な局内装置が、 伝送路と接続している第１の波長多重分離器と、 前記第１の波長多重分離器の出力を入力とする第１の光
−電気変換回路（「Ｏ−Ｅ変換回路」という）と、 前記第１のＯ−Ｅ変換回路の出力を入力とする距離測定
回路と、 前記距離測定回路の出力を入力とする位相制御情報生成
回路と、 局内装置主信号と前記位相制御情報生成回路の出力を入
力とする挿入回路と、 前記挿入回路の出力を入力とし、その出力が前記第１の
波長多重分離器に接続される第１の電気−光変換回路
（「Ｅ−Ｏ変換回路」という）と、 を備え、 前記局内装置と伝送路で接続される光分岐と、 前記光分岐と伝送路で接続される加入者装置が、 伝送路と接続している第２の波長多重分離器と、 前記第２の波長多重分離器の出力を入力とする第２のＯ
−Ｅ変換回路と、 前記第２のＯ−Ｅ変換回路の出力を入力とする位相制御
情報抽出回路と、 前記位相制御情報抽出回路の出力と加入者装置主信号を
入力とする出力位相制御回路と、 前記位相制御情報抽出回路の出力を入力とする光出力制
御回路と、 前記出力位相制御回路の出力と前記光出力制御回路の出
力とを入力とし、その出力が前記第２の波長多重分離器
に接続される第２のＥ−Ｏ変換回路と、 を備えることを特徴とするＰＤＳ伝送方式における光出
力制御方式。4. A passive double star (PDS) transmission system configured to perform bidirectional communication between an intra-station device and a plurality of subscriber devices via a star coupler arranged in a transmission path, wherein the subscriber device is An intra-station device capable of connecting n units (n is a natural number) is a first wavelength demultiplexer connected to a transmission line, and a first wavelength demultiplexer having an output as an input. An optical-electrical conversion circuit (referred to as "O-E conversion circuit"), a distance measurement circuit having the output of the first O-E conversion circuit as an input, and phase control information having an output of the distance measurement circuit as an input. A generation circuit; an insertion circuit having the internal device main signal and the output of the phase control information generation circuit as inputs; and an output of the insertion circuit as an input, the output of which is connected to the first wavelength demultiplexer. 1 electro-optical conversion circuit ("EO conversion times And a second wavelength division multiplexing device in which the optical branch connected to the intra-station device via the transmission path and the subscriber apparatus connected to the optical branch via the transmission path are connected to the transmission path. A separator and a second O 2 having an output of the second wavelength demultiplexer as an input
-E conversion circuit, phase control information extraction circuit having the output of the second OE conversion circuit as an input, and output phase control circuit having the output of the phase control information extraction circuit and a subscriber unit main signal as an input An optical output control circuit having an output of the phase control information extraction circuit as an input, and an output of the output phase control circuit and an output of the optical output control circuit having an output thereof as the second wavelength demultiplexer. A second E-O conversion circuit connected to the device, and an optical output control method in the PDS transmission method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7242502A JP2921448B2 (en) | 1995-08-28 | 1995-08-28 | Optical output control method in PDS transmission method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7242502A JP2921448B2 (en) | 1995-08-28 | 1995-08-28 | Optical output control method in PDS transmission method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0964904A true JPH0964904A (en) | 1997-03-07 |
| JP2921448B2 JP2921448B2 (en) | 1999-07-19 |
Family
ID=17090057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7242502A Expired - Fee Related JP2921448B2 (en) | 1995-08-28 | 1995-08-28 | Optical output control method in PDS transmission method |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7409164B2 (en) | 2004-04-30 | 2008-08-05 | Samsung Electronics Co., Ltd. | Optical transceiver for compensating for loss due to transmission distance in passive optical network |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05276144A (en) * | 1991-11-15 | 1993-10-22 | Nec Corp | Tdma system light transmission system |
| JPH05336143A (en) * | 1992-06-01 | 1993-12-17 | Nippon Telegr & Teleph Corp <Ntt> | Burst signal multiplexing phase control system |
-
1995
- 1995-08-28 JP JP7242502A patent/JP2921448B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05276144A (en) * | 1991-11-15 | 1993-10-22 | Nec Corp | Tdma system light transmission system |
| JPH05336143A (en) * | 1992-06-01 | 1993-12-17 | Nippon Telegr & Teleph Corp <Ntt> | Burst signal multiplexing phase control system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7409164B2 (en) | 2004-04-30 | 2008-08-05 | Samsung Electronics Co., Ltd. | Optical transceiver for compensating for loss due to transmission distance in passive optical network |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2921448B2 (en) | 1999-07-19 |
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