JPS58187912A - Series-parallel converting device of optical signal - Google Patents
Series-parallel converting device of optical signalInfo
- Publication number
- JPS58187912A JPS58187912A JP57072106A JP7210682A JPS58187912A JP S58187912 A JPS58187912 A JP S58187912A JP 57072106 A JP57072106 A JP 57072106A JP 7210682 A JP7210682 A JP 7210682A JP S58187912 A JPS58187912 A JP S58187912A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- coupler
- output
- random access
- light
- 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.)
- Granted
Links
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
- H04B10/25—Arrangements specific to fibre transmission
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Integrated Circuits (AREA)
- Optical Communication System (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、主にディジタル信号光伝送において、パラレ
ルのビット信号をシリアル信号に変換する直列−並列変
換装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a serial-to-parallel converter that converts parallel bit signals into serial signals mainly in digital signal optical transmission.
ディジタル信号伝送において、電子計算機によって処理
されたものや、Ａ／Ｄ 変換出力等の被伝送信号は基本
的には複数のビット信号がパラレルに出力されるもので
あり、これを時間的なシリアル信号に変換（ｐ−ｓ変換
）して伝送することが必要であり、そのためにＰ−８変
換は必要不可欠のものである。このパラレル信号は電子
計算機の種類によって異なるが、４〜３２ビツトが通常
良く使用される。またＰＣＭ信号伝送等においても同様
である。近年、処理速度が飛躍的に増大し、伝送速度も
著しく高速化されてきている。たとえば、パラレルの８
ビット信号が３０ Ｍｂｐｓで処理されたとすると、シ
リアル時の伝送速度は２４０Ｍｂ ｐ ｓとなり、Ｐ−
８変換の処理速度や、光伝送時の発光素子の駆動速度に
対して大変な高速化が要求される。In digital signal transmission, signals processed by electronic computers and signals to be transmitted such as A/D conversion output are basically multiple bit signals output in parallel, which are converted into temporal serial signals. It is necessary to convert the data into (p-s conversion) and transmit it, and for this purpose, P-8 conversion is indispensable. This parallel signal differs depending on the type of computer, but 4 to 32 bits are usually used. The same applies to PCM signal transmission and the like. In recent years, processing speeds have increased dramatically, and transmission speeds have also increased significantly. For example, parallel 8
If the bit signal is processed at 30 Mbps, the serial transmission speed will be 240 Mbps, and P-
Significantly faster processing speeds for 8-conversion and driving speeds for light-emitting elements during optical transmission are required.
本発明の目的は、前述のＰ−８変換のために、電気的に
はパラレル信号のみを用い、Ｐ−８変換を光を用いて行
なう、高速のＰＳ変換装置を提供するものである。An object of the present invention is to provide a high-speed PS conversion device that electrically uses only parallel signals and performs P-8 conversion using light.
以下本発明の一実施例の光ｐｓ変換装置を基本構成概略
図である第１図を用いて説明する。ある周期で規制的に
パルス発光する発光素子１よりの出力６が光ランダムア
クセスカップラ２に導かれる。伝送されるべきパラレル
電気信号ａ１〜ａｎが被伝送信号発生部３より出力され
る。光ランダムアクセスカップラ２は、この電気信号ａ
１〜ａｎに対応する光出力端子ｂ１〜ｂｎを有し、各端
子ｂ１〜ｂｎからの光の出力の有無は対応する電気入力
信号８１〜ａｎのレベルにより決定される。ここで、光
ランダムアクセスカップラ２の動作を第２図に示す構成
図をもとに述べる。第２図す。は光入力であり、第１の
導波路１１に入力される。この光ランダムアクセスカッ
プラ２は、ＧａＡｓ ’！たはＩｎＰ等より成る基板１
０の上に第１の導波路１１と第２の導波路１２を順次形
成し、この２つの導波路で結合導波路を形成し、その結
合度を電圧制御し、第１の導波路１１から第２の導波路
１２への光の結合度を変化させて光を取りだすものであ
る。An optical PS converter according to an embodiment of the present invention will be described below with reference to FIG. 1, which is a schematic diagram of the basic configuration. An output 6 from a light emitting element 1 that emits pulse light in a regulated manner at a certain period is guided to an optical random access coupler 2. Parallel electrical signals a1 to an to be transmitted are output from the transmitted signal generating section 3. The optical random access coupler 2 receives this electric signal a
It has optical output terminals b1 to bn corresponding to signals 81 to 81 to an, and the presence or absence of light output from each terminal b1 to bn is determined by the level of the corresponding electrical input signal 81 to an. Here, the operation of the optical random access coupler 2 will be described based on the configuration diagram shown in FIG. Figure 2. is an optical input and is input to the first waveguide 11. This optical random access coupler 2 is made of GaAs'! Substrate 1 made of InP or the like
0, a first waveguide 11 and a second waveguide 12 are sequentially formed on the top of the waveguide 0, a coupling waveguide is formed by these two waveguides, and the degree of coupling is controlled by voltage. The light is extracted by changing the degree of coupling of light to the second waveguide 12.
第２図の１３〜１６が電極であり、ここと基板１ｏとの
間に電圧を印加して屈折率を変化させて結合度を変化さ
せる。この例では電圧印加時に第１の導波路１１から第
２の導波路１２に光がとり出せるものとする。第２の導
波路１２に導かれた光は各電極の横に配されたグレーデ
ィングカップラ１７〜２０により外部に取り出される。Reference numerals 13 to 16 in FIG. 2 are electrodes, and a voltage is applied between these electrodes and the substrate 1o to change the refractive index and the degree of coupling. In this example, it is assumed that light can be extracted from the first waveguide 11 to the second waveguide 12 when voltage is applied. The light guided to the second waveguide 12 is extracted to the outside by grading couplers 17 to 20 arranged beside each electrode.
第２図では、電極数が４個であり、光出射端も４個設け
た例であるが、電極数とグレーティングの数を増やす事
により、これ以上の場合でも対応可能である。第２図の
ａ１〜ａ４がパラレル電気信号の印加端子であり、ｂ１
〜ｂ４が各電気信号レベルにより取り出される光を示し
ている。Although FIG. 2 shows an example in which the number of electrodes is four and the number of light emitting ends is also four, it is possible to accommodate a case with more than this number by increasing the number of electrodes and the number of gratings. A1 to a4 in FIG. 2 are parallel electric signal application terminals, and b1
~b4 indicates the light extracted by each electrical signal level.
さて、第１図に戻って、このようにして光ランダムアク
セスカップラ２よりの光出力ｂ１〜ｂｎは、各出力に対
応する光ファイバ又は導波路６に導かれ、カップラ４に
より伝送用光ファイバ又は導波路７に結合される。Now, returning to FIG. 1, the optical outputs b1 to bn from the optical random access coupler 2 are guided to the optical fibers or waveguides 6 corresponding to each output, and the coupler 4 connects them to the transmission optical fibers or waveguides 6. It is coupled to the waveguide 7.
次に、この構成により電気的なパラレル信号が光のシリ
アルパルス列に変換される動作を説明する。第３図にタ
イムチャートを示す。第３図（イ）が発光素子１より出
力される光パルスである。図中ｂｏと示した期間のみ発
光するものとする。第３図（ロ）が光カップラ４の出力
信号であり、図中ｂ１〜ｂ４の光パルス列が第２図に示
す光ランダムアクセスカップラ２のｂ１〜ｂ４の光出力
に対応しているものである。発光素子１の出力光パルス
ｂ０がこの光ランダムアクセスカップラ２に入った時、
例えばパラレル電気信号がすべてハイレベルである時に
は、先づ第１の電極１３の下に形成された結合導波路１
１より光の一部が第２の導波路１２に取り出され、グレ
ーティング１７により光が外部にとり出されｂｌとなる
。光パルスｂ０が次々に各電極下を通過する事により、
時間的に先づｂｌが出力され、次にｂ ・・・・・・
というように次々に光が出力されるので、これをカップ
ラ４により一つのファイバ又は導波路に導けば光のシリ
アルパルス列が発生した事になる。また、この光パルス
の有無は各電極に印加されたパラレル電気信号のレベル
により決定される事になる。つまり、パラレル電気信号
が光のシリアルパルス列に変換された事になる。Next, the operation of converting an electrical parallel signal into an optical serial pulse train using this configuration will be explained. Figure 3 shows a time chart. FIG. 3(A) shows a light pulse output from the light emitting element 1. It is assumed that light is emitted only during the period indicated as bo in the figure. FIG. 3(b) shows the output signal of the optical coupler 4, and the optical pulse trains b1 to b4 in the figure correspond to the optical outputs b1 to b4 of the optical random access coupler 2 shown in FIG. . When the output optical pulse b0 of the light emitting element 1 enters this optical random access coupler 2,
For example, when all parallel electrical signals are at high level, first the coupling waveguide 1 formed under the first electrode 13
A part of the light is taken out from the grating 17 to the second waveguide 12, and the light is taken out to the outside by the grating 17 to become bl. By passing the light pulse b0 under each electrode one after another,
Time-wise, bl is output first, then b...
Since the light is output one after another in this way, if this is guided to one fiber or waveguide by the coupler 4, a serial pulse train of light is generated. Moreover, the presence or absence of this optical pulse is determined by the level of the parallel electric signal applied to each electrode. In other words, a parallel electrical signal is converted into a serial pulse train of light.
また第１の導波路１１から第２の導波路１２への光の結
合の強さは結合長さと屈折率差、導波路間の距離等によ
って変化する。Ｐ−８変換のためにはｂ１〜ｂｎの光出
力パワーが同じである事が理想である。そこで各結合部
結合度を一定にするのでなく、後のもの程結合度が太き
くなるようにしておくのが良い。そのためのもっとも簡
単な方法は端子ａ１〜ａ７に印加される′電圧を後のも
の程電圧を少しづつ高くなるようにしておく事である。Further, the strength of coupling of light from the first waveguide 11 to the second waveguide 12 changes depending on the coupling length, the refractive index difference, the distance between the waveguides, and the like. For P-8 conversion, it is ideal that the optical output powers of b1 to bn are the same. Therefore, instead of making the degree of bonding of each bond constant, it is better to set the degree of bonding to be thicker in the later parts. The simplest method for this purpose is to set the voltages applied to the terminals a1 to a7 so that the later the terminals are, the higher the voltage is gradually increased.
第２図の光ランダムアクセスカップラ２では、各電極１
３〜１６の間隔により光の遅延時間が決定されるため、
光パルスの周期は非常に小さくなってしまう。光パルス
の周期を適当に選ぶために素子の大きさを変化させるの
では自由度が少なくなる。そこで第４図に示すように、
光ランダムアクセスカップラ２の光出力ｂ１〜ｂ４をあ
る遅延時間を有する遅延素子を介して光カップラ４と結
合する方法がある。２１〜２４が遅延素子であり、これ
には、−例としである長さのファイバ又は導波路を用い
てもできる。ｂｌに接続される遅延時間をτ１とし、以
下ｂ２にはτ２というように遅延時間を決める。この時
の光パルス入力と光カツプラ出力Ｃとの時間関係を第５
図に示す。同図（ハ）は光入力パルスｂ０であり、同図
に）は光カツプラ出力Ｃである。光パルスｂ０が入射し
た時間を基準に、τ１遅れてｂ′が光カップラ４に入射
し、次にて２遅れてｂ′２・・・・・・というように順
次光パルス列が光カップラ４に入射される。この時、発
光素子１はパルス発振で良いため、連続出力時よりビー
クパワーを多く取り出せるという利点をも有している。In the optical random access coupler 2 shown in FIG.
Since the delay time of light is determined by the interval of 3 to 16,
The period of the light pulse becomes very small. Changing the size of the element in order to appropriately select the period of the optical pulse reduces the degree of freedom. Therefore, as shown in Figure 4,
There is a method of coupling the optical outputs b1 to b4 of the optical random access coupler 2 to the optical coupler 4 via a delay element having a certain delay time. 21-24 are delay elements, which can be, for example, fibers or waveguides of certain lengths. The delay time connected to bl is set as τ1, and the delay time is determined as τ2 for b2 below. The time relationship between the optical pulse input and the optical coupler output C at this time is expressed as
As shown in the figure. The figure (c) is the optical input pulse b0, and the figure (c) is the optical coupler output C. Based on the time when the optical pulse b0 is incident, b' enters the optical coupler 4 with a delay of τ1, then b'2 with a delay of 2, and so on.The optical pulse train enters the optical coupler 4 sequentially. It is incident. At this time, since the light emitting element 1 only needs to oscillate in pulses, it also has the advantage of being able to extract more peak power than when outputting continuously.
以上のように本発明は被伝送信号発生部からの電気的パ
ラレル信号を光ランダムアクセスカップラに同時に印加
し、共通の発光素子からの光線を前記パラレル信号を構
成する一つ一つの信号によって順次変調して時系列光パ
ルス信号を得る。すなわち、本発明は電気的なパラレル
信号を直接光のシリアルパルス列に変換することを可能
とするため、コンパクトでかつ非常に高速動作が可能な
パラレルシリアル変換を行うことができる。As described above, the present invention simultaneously applies electrical parallel signals from a transmitted signal generating section to an optical random access coupler, and sequentially modulates a light beam from a common light emitting element by each signal making up the parallel signal. to obtain a time-series optical pulse signal. That is, since the present invention makes it possible to directly convert an electrical parallel signal into an optical serial pulse train, it is possible to perform parallel-to-serial conversion that is compact and capable of extremely high-speed operation.
第１図は本発明の一実施例における充血並列変換装置の
基本構成図、第２図は第１図の構成要素である光ランダ
ムアクセスカップラの構成例を示す図、第３図は第１図
に示す構成の動作説明用り４図に示す構成の動作説明用
タイミングチャートである。FIG. 1 is a basic configuration diagram of a hyperemia parallel conversion device according to an embodiment of the present invention, FIG. 2 is a diagram showing a configuration example of an optical random access coupler which is a component of FIG. 1, and FIG. 3 is a diagram similar to that shown in FIG. FIG. 4 is a timing chart for explaining the operation of the configuration shown in FIG. 4; FIG.
１・・・・・・発光素子、２・・・・・・光ランダムア
クセスカップラ、３・・・・・・被伝送信号発生部、４
・・・・・拳カップラ、６，７・・・・０導波路、２１
〜２４・拳００遅延素子。DESCRIPTION OF SYMBOLS 1... Light emitting element, 2... Optical random access coupler, 3... Transmitted signal generating section, 4
...Fist coupler, 6,7...0 waveguide, 21
~24・Fist 00 delay element.
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
第２図
第３図
す。Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3.
第４図 Ｑ、＋ （２ｘ Ｑ３Ｑ４Figure 4 Q, + (2x Q3Q4
Claims (2)
と、前記発光素子の出力を複数本の導波路にランダムア
クセスする光ランダムアクセスカップラと、前記複数本
の導波”路の出力光を一本のファイバにまとめるカップ
ラとから構成される光信号直並列変換装置。(1) A light emitting element that emits pulse light at least at a predetermined period; an optical random access coupler that randomly accesses the output of the light emitting element to a plurality of waveguides; An optical signal serial-to-parallel converter consisting of a coupler that connects the optical signal to a fiber.
々異なる遅延時間を持たせる手段を有する特許請求の範
囲第１項記載の光信号直並列変換装置。(2) The optical signal serial-to-parallel converter according to claim 1, wherein the plurality of waveguides of the optical random access coupler each have means for providing different delay times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57072106A JPS58187912A (en) | 1982-04-28 | 1982-04-28 | Series-parallel converting device of optical signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57072106A JPS58187912A (en) | 1982-04-28 | 1982-04-28 | Series-parallel converting device of optical signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58187912A true JPS58187912A (en) | 1983-11-02 |
| JPH0230492B2 JPH0230492B2 (en) | 1990-07-06 |
Family
ID=13479805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57072106A Granted JPS58187912A (en) | 1982-04-28 | 1982-04-28 | Series-parallel converting device of optical signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58187912A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61230123A (en) * | 1985-04-04 | 1986-10-14 | Nippon Telegr & Teleph Corp <Ntt> | Optical series parallel/parallel series converting circuit |
| JPS6289936A (en) * | 1985-10-16 | 1987-04-24 | Fuji Photo Film Co Ltd | Lightguide element |
| US4718063A (en) * | 1985-06-20 | 1988-01-05 | The United States Of America As Represented By The Secretary Of The Navy | Optoelectronic integrated circuit multiplex |
| US4923267A (en) * | 1988-12-05 | 1990-05-08 | Gte Laboratories Incorporated | Optical fiber shift register |
| US4961621A (en) * | 1988-12-22 | 1990-10-09 | Gte Laboratories, Inc. | Optical parallel-to-serial converter |
| WO1994006052A1 (en) * | 1992-09-10 | 1994-03-17 | Fujitsu Limited | Optical circuit system and its constituents |
| US6693736B1 (en) | 1992-09-10 | 2004-02-17 | Fujitsu Limited | Optical circuit system and components of same |
-
1982
- 1982-04-28 JP JP57072106A patent/JPS58187912A/en active Granted
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61230123A (en) * | 1985-04-04 | 1986-10-14 | Nippon Telegr & Teleph Corp <Ntt> | Optical series parallel/parallel series converting circuit |
| US4718063A (en) * | 1985-06-20 | 1988-01-05 | The United States Of America As Represented By The Secretary Of The Navy | Optoelectronic integrated circuit multiplex |
| JPS6289936A (en) * | 1985-10-16 | 1987-04-24 | Fuji Photo Film Co Ltd | Lightguide element |
| US4923267A (en) * | 1988-12-05 | 1990-05-08 | Gte Laboratories Incorporated | Optical fiber shift register |
| US4961621A (en) * | 1988-12-22 | 1990-10-09 | Gte Laboratories, Inc. | Optical parallel-to-serial converter |
| WO1994006052A1 (en) * | 1992-09-10 | 1994-03-17 | Fujitsu Limited | Optical circuit system and its constituents |
| US5757989A (en) * | 1992-09-10 | 1998-05-26 | Fujitsu Limited | Optical circuit system capable of producing optical signal having a small fluctuation and components of same |
| US6215585B1 (en) | 1992-09-10 | 2001-04-10 | Fujitsu Limited | Optical circuit system and components of same technical field |
| US6693736B1 (en) | 1992-09-10 | 2004-02-17 | Fujitsu Limited | Optical circuit system and components of same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0230492B2 (en) | 1990-07-06 |
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