JP3156742B2 - Optical demultiplexer - Google Patents
Optical demultiplexerInfo
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- JP3156742B2 JP3156742B2 JP27532193A JP27532193A JP3156742B2 JP 3156742 B2 JP3156742 B2 JP 3156742B2 JP 27532193 A JP27532193 A JP 27532193A JP 27532193 A JP27532193 A JP 27532193A JP 3156742 B2 JP3156742 B2 JP 3156742B2
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- optical
- pulse train
- light
- signal
- optical pulse
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、多重化された高速な光
信号を複数の低速な光信号に変換する光多重分離装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical demultiplexer for converting a multiplexed high-speed optical signal into a plurality of low-speed optical signals.
【０００２】[0002]
【従来の技術】従来の光多重分離装置は、高速な光パル
ス列から一定時間間隔ごとの光パルスを光ゲートや光ス
イッチを用いて抜き出す構成になっていた。そのため
に、光ゲートや光スイッチには、光パルス列の信号速度
程度の処理速度が要求されていた。見方を変えると、光
多重分離装置で処理可能な光パルス列の信号速度は、電
気制御による光ゲートや光スイッチの処理速度によって
制限を受けることになり、光信号の高速性を十分に活か
すことができなかった。2. Description of the Related Art A conventional optical multiplexing / demultiplexing apparatus has a configuration in which optical pulses at predetermined time intervals are extracted from a high-speed optical pulse train using an optical gate or an optical switch. For this reason, optical gates and optical switches have been required to have a processing speed on the order of the signal speed of the optical pulse train. In other words, the signal speed of an optical pulse train that can be processed by an optical multiplexing / demultiplexing device is limited by the processing speed of optical gates and optical switches controlled by electrical control, making full use of the high speed of optical signals. could not.
【０００３】そこで、数十〜百Ｇb/s の光パルス列にも
対応できる超高速動作が可能な非線形光スイッチを用い
た光多重分離装置が考案されている。なお、高速な光パ
ルス列は、半導体レーザの利得スイッチングやモード同
期法を用いた短光パルス列生成器と、光強度変調器およ
び遅延回路を組み合わせることにより容易に得られてい
る。Therefore, an optical multiplexing / demultiplexing device using a non-linear optical switch capable of operating at a very high speed capable of coping with an optical pulse train of several tens to hundreds of Gb / s has been devised. Note that a high-speed optical pulse train is easily obtained by combining a short optical pulse train generator using gain switching or mode locking of a semiconductor laser, an optical intensity modulator, and a delay circuit.
【０００４】図６は、非線形光スイッチを用いた従来の
光多重分離装置の構成を示す。図において、非線形光ス
イッチ６０は、非線形媒質６１、波長フィルタ６２およ
び偏光ビームスプリッタ６３を含む構成であり、多重化
された信号光Ｓ0 および制御光Ｃを入力し、多重分離さ
れた一方の信号光Ｓ1 と他方の信号光Ｓ2 および制御光
Ｃを出力する。なお、図は、短光パルスを制御光として
高速な光パルス列から１つの光パルスを抜き出す操作を
示している。以下、非線形媒質６１として、偏波保持フ
ァイバを用いた場合についてその動作を説明する。FIG. 6 shows a configuration of a conventional optical demultiplexer using a nonlinear optical switch. In the figure, the nonlinear optical switch 60, the nonlinear medium 61 has a configuration including a wavelength filter 62 and the polarizing beam splitter 63, and enter the multiplexed signal light S 0 and the control light C, demultiplexed one signal outputs light S 1 and the other signal light S 2 and the control light C. The figure shows an operation of extracting one optical pulse from a high-speed optical pulse train using a short optical pulse as control light. Hereinafter, the operation when the polarization maintaining fiber is used as the nonlinear medium 61 will be described.
【０００５】信号光Ｓ0 は単一偏光とし、偏波保持ファ
イバにその主軸と45度傾けた状態で入力する。また、制
御光Ｃは信号光Ｓ1 と波長が異なる短光パルスとし、信
号光Ｓ0 から抜き出したい光パルス（以下「特定パル
ス」という。）に重畳し、かつ偏波保持ファイバの主軸
に一致させて入力する。偏波保持ファイバ中では、制御
光Ｃと偏光が一致する特定パルスの偏光成分が、光カー
効果により制御光Ｃのパワーに比例した屈折率変化を受
けて回転する。信号光Ｓ0 の特定パルスと他のパルスの
偏光角の差が90度になったところで偏波保持ファイバか
ら出力させる。波長フィルタ６２は信号光Ｓ0 から制御
光Ｃを分離し、偏光ビームスプリッタ６３は信号光Ｓ0
から特定パルス（信号光Ｓ1 ）と他のパルス（信号光Ｓ
2 ）を分離する。The signal light S 0 has a single polarization, and is input to the polarization maintaining fiber in a state of being inclined by 45 degrees with respect to its main axis. The control light C is a short light pulse having a wavelength different from that of the signal light S 1 , is superimposed on an optical pulse to be extracted from the signal light S 0 (hereinafter referred to as “specific pulse”), and coincides with the main axis of the polarization maintaining fiber. And input. In the polarization maintaining fiber, the polarization component of the specific pulse having the same polarization as the control light C rotates due to a refractive index change proportional to the power of the control light C due to the optical Kerr effect. Difference in polarization angle of a particular pulse and other pulse of the signal light S 0 is thereby output from the polarization maintaining fiber where it becomes 90 degrees. The wavelength filter 62 separates the control light C from the signal light S 0 , and the polarization beam splitter 63 outputs the signal light S 0
A specific pulse (signal light S 1 ) and another pulse (signal light S
2 ) Separate.
【０００６】このような原理により、非線形光スイッチ
６０に入力される信号光Ｓ0 から、制御光Ｃと重なる特
定パルスを分離して出力することができる。なお、光カ
ー効果は非常に高速な現象であり、電気的制御では不可
能な超高速スイッチングが可能になっている。According to such a principle, a specific pulse overlapping with the control light C can be separated and output from the signal light S 0 input to the nonlinear optical switch 60. The optical Kerr effect is a very high-speed phenomenon, and enables ultra-high-speed switching that cannot be performed by electrical control.
【０００７】[0007]
【発明が解決しようとする課題】しかし、非線形光スイ
ッチを用いた従来の光多重分離装置では、信号光Ｓ0 と
制御光Ｃの相互作用の強さ（光カー効果）は非常に弱
く、かつ制御光Ｃのパワーに依存する。したがって、制
御光Ｃのパワーを十分に大きくかつ安定させる必要があ
る。また、スイッチング時間は制御光Ｃのパルス幅以下
にはできない。また、制御光Ｃのパルス幅を調整すれ
ば、時系列上に並んだ複数の光パルス（複数ビット）を
一括して抜き出すことはできるが、低速な信号に変換す
ることはできない。However, in the conventional optical demultiplexer using a nonlinear optical switch, the intensity of the interaction between the signal light S 0 and the control light C (optical Kerr effect) is very weak, and It depends on the power of the control light C. Therefore, the power of the control light C needs to be sufficiently large and stable. Further, the switching time cannot be shorter than the pulse width of the control light C. Further, if the pulse width of the control light C is adjusted, a plurality of light pulses (a plurality of bits) arranged in a time series can be collectively extracted, but cannot be converted into a low-speed signal.
【０００８】本発明は、超高速な光多重分離や、複数ビ
ットの一括多重分離を簡単な構成により実現することが
できる光多重分離装置を提供することを目的とする。An object of the present invention is to provide an optical multiplexing / demultiplexing apparatus capable of realizing ultra-high-speed optical multiplexing / demultiplexing and batch multiplexing / demultiplexing of a plurality of bits with a simple configuration.
【０００９】[0009]
【課題を解決するための手段】請求項１に記載の発明
は、入力された光パルス列のうち、所定の時間間隔で所
定の時間領域に存在する光パルス列を通過させる第１の
光強度変調器と、その光パルス列に対して、所定の拡大
率で時間軸上に拡大する光パルス列拡大部と、その光パ
ルス列のうち、所定の時間間隔で所定の時間領域に存在
する少なくとも１つの光パルスを通過させる第２の光強
度変調器とを備える。According to a first aspect of the present invention, there is provided a first light intensity modulator for passing an optical pulse train existing in a predetermined time region at a predetermined time interval among input optical pulse trains. And an optical pulse train expanding unit that expands the optical pulse train on the time axis at a predetermined expansion rate, and among the optical pulse trains, at least one optical pulse that exists in a predetermined time region at a predetermined time interval. A second light intensity modulator for passing the light.
【００１０】請求項２に記載の発明は、請求項１に記載
の光多重分離装置を複数個備え、入力された光信号を複
数に分岐して各光多重分離装置のそれぞれに入力させる
光分岐部を備える。According to a second aspect of the present invention, there is provided an optical branching device comprising a plurality of the optical multiplexing / demultiplexing devices according to the first aspect, wherein the input optical signal is split into a plurality of optical signals and input to the respective optical multiplexing / demultiplexing devices. It has a unit.
【００１１】[0011]
【作用】本発明の光多重分離装置では、まず第１の光強
度変調器で入力光パルスから周期的に所定の光パルス列
を抜き出す。光パルス列拡大部は、第１の光強度変調器
で抜き出された光パルス列を所定の拡大率で時間軸上に
拡大する。第２の光強度変調器は、光パルス列拡大部で
拡大された光パルス列からさらに少なくとも１つの光パ
ルスを抜き出す。In the optical demultiplexing apparatus according to the present invention, a first optical intensity modulator periodically extracts a predetermined optical pulse train from an input optical pulse. The optical pulse train expanding unit expands the optical pulse train extracted by the first light intensity modulator on a time axis at a predetermined expansion rate. The second light intensity modulator further extracts at least one light pulse from the light pulse train expanded by the light pulse train expansion unit.
【００１２】このように、光パルス列拡大部では、設定
される拡大率に応じて実質的に高速光信号を低速光信号
に変換することができる。また、第２の光強度変調器で
は、拡大された光パルス列から少なくとも１つの光パル
スを抜き出すことにより、光信号の多重分離を行うこと
ができる。しかも、そのときに連続する複数の光パルス
を一括して多重分離することが可能である。As described above, the optical pulse train expanding section can substantially convert a high-speed optical signal into a low-speed optical signal in accordance with the set magnification. In the second light intensity modulator, the optical signal can be demultiplexed by extracting at least one light pulse from the expanded light pulse train. Moreover, it is possible to collectively demultiplex a plurality of consecutive light pulses at that time.
【００１３】[0013]
【実施例】図１は、請求項１に記載の発明の実施例構成
を示す。図において、光強度変調器１１は、多重化され
た光パルス列および制御信号を入力し、光パルス列
を出力する。光パルス列拡大部１２は、この光パルス
列および位相変調信号を入力し、光パルス列を出
力する。光強度変調器１３は、この光パルス列および
制御信号を入力し、特定パルスを出力する。FIG. 1 shows the configuration of an embodiment of the first aspect of the present invention. In the figure, an optical intensity modulator 11 receives a multiplexed optical pulse train and a control signal, and outputs an optical pulse train. The optical pulse train enlarging unit 12 receives the optical pulse train and the phase modulation signal, and outputs an optical pulse train. The light intensity modulator 13 receives the light pulse train and the control signal and outputs a specific pulse.
【００１４】図２は、光パルス列拡大部１２の構成例を
示す。図において、光パルス列拡大部１２は、第１の分
散付加部２１、外部から与えられる位相変調信号によ
って光パルス列に正（または負）の線形な周波数変位を
生じさせる光位相変調器２２、第２の分散付加部２３を
縦続に接続した構成である。光位相変調器２２には、電
気光学効果をもつ材料（例えばLiNbO3）からなる導波路
形のものを用いることができる。分散付加部２１，２３
には、入力光波長に対して正常分散媒質（または異常分
散媒質）として働く光ファイバや回折格子対を用いるこ
とができる。FIG. 2 shows an example of the configuration of the optical pulse train expanding section 12. In the figure, an optical pulse train enlarging unit 12 includes a first dispersion adding unit 21, an optical phase modulator 22 for generating a positive (or negative) linear frequency displacement in an optical pulse train by an externally applied phase modulation signal, Are connected in cascade. As the optical phase modulator 22, a waveguide type material made of a material having an electro-optic effect (for example, LiNbO 3 ) can be used. Dispersion adding units 21 and 23
An optical fiber or a diffraction grating pair that functions as a normal dispersion medium (or an abnormal dispersion medium) with respect to the input light wavelength can be used.
【００１５】このような構成において、第１の分散付加
部２１の入力光の時間波形が、第２の分散付加部２３の
出力端で再生されるための条件について、第１の分散付
加部２１での群速度分散量をＢ1 、第２の分散付加部２
３での群速度分散量をＢ2 、位相変調角周波数をωm 、
位相変調度をαとすると、 （１／Ｂ1)＋（１／Ｂ2)＝α・ωm 2 …(1) の関係が成り立つ。In such a configuration, the conditions for the time waveform of the input light of the first dispersion adding section 21 to be reproduced at the output end of the second dispersion adding section 23 are as follows. The amount of group velocity dispersion at B is B 1 , the second dispersion adding unit 2
3, the group velocity dispersion amount at B 3 , the phase modulation angular frequency at ω m ,
Assuming that the phase modulation degree is α, the relationship of (1 / B 1 ) + (1 / B 2 ) = α · ω m 2 (1) holds.
【００１６】ここで、Ｆt＝１／(α・ωm 2) とすると、
(1)式はレンズを用いた結像系の式 （１／ｓ1)＋（１／ｓ2)＝１／ｆ …(2) と同じ形の式となる。なお、ｓ1 ，ｓ2 ，ｆは、それぞ
れ物体面からレンズまでの距離，レンズから像面までの
距離，レンズの焦点距離を表す。Here, assuming that F t = 1 / (α · ω m 2 ),
The expression (1) has the same form as the expression (1 / s 1 ) + (1 / s 2 ) = 1 / f (2) of the imaging system using the lens. Note that s 1 , s 2 , and f represent the distance from the object plane to the lens, the distance from the lens to the image plane, and the focal length of the lens, respectively.
【００１７】したがって、図２に示す構成の光パルス列
拡大部１２を用いれば、空間系のレンズのように時間軸
上の波形の大きさを変換（拡大，縮小）することができ
る。このときの波形の倍率Ｍ（Ｍ＞１ならば波形拡大、
０＜Ｍ＜１ならば波形縮小）は、 Ｍ＝Ｂ2／Ｂ1 …(3) となる。本実施例では、Ｍ＞１となるようにＢ1 ，Ｂ2
を選択することにより、光パルス列拡大部１２に入力さ
れた信号光を対応する倍率で時間軸上に拡大することが
できる。この原理を用いた光拡大では、複数パルスの入
力光を一括して拡大することが可能である。Therefore, by using the optical pulse train enlarging unit 12 having the configuration shown in FIG. 2, the magnitude of the waveform on the time axis can be converted (enlarged or reduced) like a spatial lens. The magnification M of the waveform at this time (if M> 1, the waveform is enlarged,
(If 0 <M <1, the waveform is reduced.) M = B 2 / B 1 (3) In this embodiment, B 1 and B 2 are set so that M> 1.
Is selected, the signal light input to the optical pulse train expanding unit 12 can be expanded on the time axis at a corresponding magnification. In optical expansion using this principle, it is possible to collectively expand input light of a plurality of pulses.
【００１８】ここで、本実施例の光多重分離装置の動作
について、図３を参照して説明する。多重化された光パ
ルス列から抜き出したい光パルス（特定パルス）をぬ
りつぶして示す。光強度変調器１１は、制御信号によ
って連続する光パルス列から特定パルスを含む有限の
光パルス列を抜き出す。この光パルス列は、位相変
調信号が入力される光パルス列拡大部１２で時間軸上
で拡大される。光強度変調器１３は、制御信号によっ
て光パルス列から特定パルスを抜き出す。Here, the operation of the optical multiplexing / demultiplexing apparatus of this embodiment will be described with reference to FIG. An optical pulse (specific pulse) to be extracted from the multiplexed optical pulse train is shown by being painted. The light intensity modulator 11 extracts a finite light pulse train including a specific pulse from the continuous light pulse train by the control signal. This optical pulse train is expanded on the time axis by the optical pulse train expanding unit 12 to which the phase modulation signal is input. The light intensity modulator 13 extracts a specific pulse from the light pulse train according to the control signal.
【００１９】なお、本実施例では特定パルスが１パル
スの場合であるが、複数パルスを一括して抜き出すこと
も可能である。すなわち、光強度変調器１１，１３を制
御する制御信号，を調整することにより、複数ビッ
トの光パルス列を一括して低速信号に変換することがで
きる。また、制御信号，は、多重化された光パルス
列よりも低速な信号で対応することができる。また、
光パルス列拡大部１２では、拡大率Ｍを光位相変調器２
２に入力する位相変調信号および分散付加部２１，２
３の分散量に応じて設定できるので、任意の高速光信号
から任意の低速光信号に変換することができる。In this embodiment, the specific pulse is one pulse, but a plurality of pulses can be extracted at a time. In other words, by adjusting the control signals for controlling the light intensity modulators 11 and 13, a plurality of bits of the optical pulse train can be collectively converted into a low-speed signal. Also, the control signal can be handled by a signal that is slower than the multiplexed optical pulse train. Also,
The optical pulse train enlarging unit 12 sets the enlarging factor M to the optical phase modulator 2
2 and the dispersion adding sections 21 and 2
Since it can be set according to the dispersion amount of 3, any high-speed optical signal can be converted to any low-speed optical signal.
【００２０】また、図４に示すように、本発明の光多重
分離装置１０1 ，１０2 ，…を多段に直列に接続するこ
とにより、全体の拡大率が高まるので、超高速信号から
超低速信号への多重分離を可能にすることができる。ま
た、必要に応じて、各段から出力を取り出すことによ
り、異なる信号速度を有する階層的な多重分離を実現す
ることができる。As shown in FIG. 4, by connecting the optical multiplexing / demultiplexing devices 10 1 , 10 2 ,... Of the present invention in series in multiple stages, the overall enlargement ratio is increased. Demultiplexing into signals can be enabled. Also, by extracting the output from each stage as needed, hierarchical demultiplexing having different signal speeds can be realized.
【００２１】また、図５に示すように、本発明の光多重
分離装置１０1 〜１０4 を並列に配置し、それぞれの制
御信号Ａ〜Ｄ（光強度変調器１１，１３を制御する制御
信号，および光パルス列拡大部１２を制御する位相
変調信号）の位相が互いに異なるように設定する。そ
して、多重化された光パルス列を光分岐部５０で各光
多重分離装置１０1 〜１０4 に分岐して入力する。この
ような構成により、多重化された高速な光信号を複数の
低速な光信号に容易に多重分離することができる（請求
項２）。As shown in FIG. 5, the optical multiplexing / demultiplexing devices 10 1 to 10 4 of the present invention are arranged in parallel, and control signals A to D (control signals for controlling the light intensity modulators 11 and 13) are provided. , And the phase modulation signal for controlling the optical pulse train enlarging unit 12 are set to have different phases. Then, the input branches to the optical demultiplexer 10 1 to 10 4 optical pulse train multiplexing by the optical branching unit 50. With this configuration, the multiplexed high-speed optical signal can be easily demultiplexed into a plurality of low-speed optical signals.
【００２２】[0022]
【発明の効果】以上説明したように、本発明の光多重分
離装置は、光パルス列拡大部に設定される拡大率に応じ
て高速な光信号を低速な光信号に変換し、かつ第１およ
び第２の光強度変調器を制御することにより、高速な光
信号の複数ビットを一括して低速信号に多重分離するこ
とができる。As described above, the optical demultiplexer of the present invention converts a high-speed optical signal into a low-speed optical signal in accordance with the magnification set in the optical pulse train expanding section, By controlling the second light intensity modulator, it is possible to collectively demultiplex a plurality of bits of a high-speed optical signal into a low-speed signal.
【００２３】さらに、本発明の構成ではすべての操作を
光信号のままで行うことができるので、簡単な構成でか
つ超高速信号に対応する光多重分離装置を実現すること
ができる。Further, in the configuration of the present invention, since all operations can be performed in the form of optical signals, it is possible to realize an optical multiplexing / demultiplexing apparatus having a simple configuration and capable of handling ultra-high-speed signals.
【図１】請求項１に記載の発明の実施例構成を示すブロ
ック図。FIG. 1 is a block diagram showing a configuration of an embodiment of the invention described in claim 1;
【図２】光パルス列拡大部１２の構成例を示すブロック
図。FIG. 2 is a block diagram showing a configuration example of an optical pulse train expanding unit 12.
【図３】図１に示す実施例の動作を説明する図。FIG. 3 is a view for explaining the operation of the embodiment shown in FIG. 1;
【図４】本発明の光多重分離装置の多段構成例を示すブ
ロック図。FIG. 4 is a block diagram showing a multistage configuration example of an optical multiplexing / demultiplexing device according to the present invention.
【図５】請求項２に記載の発明の実施例構成を示すブロ
ック図。FIG. 5 is a block diagram showing a configuration of an embodiment of the invention described in claim 2;
【図６】従来の光多重分離装置の構成を示すブロック
図。FIG. 6 is a block diagram showing a configuration of a conventional optical multiplexing / demultiplexing device.
１０ 本発明の光多重分離装置 １１，１３ 光強度変調器 １２ 光パルス列拡大部 ２１，２３ 分散付加部 ２２ 光位相変調器 ５０ 光分岐部 ６０ 非線形光スイッチ ６１ 非線形媒質 ６２ 波長フィルタ ６３ 偏光ビームスプリッタ Reference Signs List 10 optical demultiplexing apparatus of the present invention 11, 13 optical intensity modulator 12 optical pulse train expanding section 21, 23 dispersion adding section 22 optical phase modulator 50 optical branching section 60 nonlinear optical switch 61 nonlinear medium 62 wavelength filter 63 polarization beam splitter
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭64−42638（ＪＰ，Ａ) 特開 平１−195429（ＪＰ，Ａ) 特開 平５−14315（ＪＰ，Ａ) 特開 平５−206988（ＪＰ，Ａ) 特開 平７−131419（ＪＰ，Ａ) Ｂｒｉａｎ Ｈ．Ｋｏｌｎｅｒ，Ｍｏ ｓｈｅ Ｎａｚａｒａｔｈｙ，”Ｔｅｍ ｐｏｒａｌ ｉｍａｇｉｎｇ ｗｉｔｈ ａ ｔｉｍｅ ｌｅｎｓ”，1989，Ｏ ｐｔｉｃｓ Ｌｅｔｔｅｒｓ，Ｖｏｌ. 14，Ｎｏ．12，ｐｐ．630−632. (58)調査した分野(Int.Cl.7，ＤＢ名) H04J 14/00 - 14/08 H04B 10/00 - 10/28 H04J 3/00 G02F 1/29 - 7/00 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-64-42638 (JP, A) JP-A-1-195429 (JP, A) JP-A-5-14315 (JP, A) JP-A-5-41529 206988 (JP, A) JP-A-7-131419 (JP, A) Brian H. Kolner, Mosher Nazarathy, "Temporal imaging with a time lenses", 1989, Optics Letters, Vol. 12, pp. 630-632. (58) Field surveyed (Int.Cl. 7 , DB name) H04J 14/00-14/08 H04B 10/00-10/28 H04J 3/00 G02F 1/29-7/00
Claims (2)
間間隔で所定の時間領域に存在する光パルス列を通過さ
せる第１の光強度変調器と、 前記第１の光強度変調器を通過した光パルス列に対し
て、所定の拡大率で時間軸上に拡大する光パルス列拡大
部と、 前記光パルス列拡大部を通過した光パルス列のうち、所
定の時間間隔で所定の時間領域に存在する少なくとも１
つの光パルスを通過させる第２の光強度変調器とを備え
たことを特徴とする光多重分離装置。1. A first light intensity modulator that passes an optical pulse train existing in a predetermined time region at a predetermined time interval among input optical pulse trains, and a first light intensity modulator that has passed through the first light intensity modulator. An optical pulse train enlarging unit that expands the optical pulse train on the time axis at a predetermined enlarging rate; and at least one of the optical pulse trains that have passed through the optical pulse train enlarging unit and are present in a predetermined time domain at a predetermined time interval.
An optical multiplexing / demultiplexing device, comprising: a second optical intensity modulator for transmitting two optical pulses.
個備え、 入力された光信号を複数に分岐して前記光多重分離装置
のそれぞれに入力させる光分岐部を備えたことを特徴と
する光多重分離装置。2. An optical demultiplexer comprising: a plurality of optical demultiplexers according to claim 1; and an optical demultiplexer for splitting an input optical signal into a plurality of optical signals and inputting them to each of the optical demultiplexers. Optical demultiplexer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27532193A JP3156742B2 (en) | 1993-11-04 | 1993-11-04 | Optical demultiplexer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27532193A JP3156742B2 (en) | 1993-11-04 | 1993-11-04 | Optical demultiplexer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07131441A JPH07131441A (en) | 1995-05-19 |
| JP3156742B2 true JP3156742B2 (en) | 2001-04-16 |
Family
ID=17553825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27532193A Expired - Fee Related JP3156742B2 (en) | 1993-11-04 | 1993-11-04 | Optical demultiplexer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3156742B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2457738B (en) * | 2005-09-27 | 2010-08-04 | Fujitsu Ltd | Optical signal separation device and optical signal separation method |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9917880D0 (en) | 1999-07-30 | 1999-09-29 | Roke Manor Research | Fast data modulator |
| GB2361847B (en) * | 2000-04-28 | 2003-12-03 | Roke Manor Research | Demultiplexer control system and method |
| JP3976673B2 (en) | 2002-12-06 | 2007-09-19 | 富士通株式会社 | Optical time division demultiplexer |
-
1993
- 1993-11-04 JP JP27532193A patent/JP3156742B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| Ｂｒｉａｎ Ｈ．Ｋｏｌｎｅｒ，Ｍｏｓｈｅ Ｎａｚａｒａｔｈｙ，"Ｔｅｍｐｏｒａｌ ｉｍａｇｉｎｇ ｗｉｔｈ ａ ｔｉｍｅ ｌｅｎｓ"，１９８９，Ｏｐｔｉｃｓ Ｌｅｔｔｅｒｓ，Ｖｏｌ．１４，Ｎｏ．１２，ｐｐ．６３０−６３２． |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2457738B (en) * | 2005-09-27 | 2010-08-04 | Fujitsu Ltd | Optical signal separation device and optical signal separation method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07131441A (en) | 1995-05-19 |
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