JP2001108524A - Optical branching filter and light receiving element array - Google Patents
Optical branching filter and light receiving element arrayInfo
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- JP2001108524A JP2001108524A JP28776499A JP28776499A JP2001108524A JP 2001108524 A JP2001108524 A JP 2001108524A JP 28776499 A JP28776499 A JP 28776499A JP 28776499 A JP28776499 A JP 28776499A JP 2001108524 A JP2001108524 A JP 2001108524A
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- Prior art keywords
- light
- receiving element
- monitoring
- noise
- light receiving
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、波長多重された光
のスペクトルをモニタする光分波器、および光分波器の
検出器に用いられる受光素子アレイに関する。[0001] 1. Field of the Invention [0002] The present invention relates to an optical demultiplexer for monitoring the spectrum of wavelength-multiplexed light, and a light receiving element array used for a detector of the optical demultiplexer.
【０００２】[0002]
【従来の技術】光の連続スペクトルを測定するための計
測装置（スペクトルモニタ）として、集光レンズで集光
された光を折り返しミラーで反射し、回折格子で連続ス
ペクトルを形成し、検出器で光の連続スペクトルを計測
する装置が知られている（島津製作所ポリクロメータ測
光システム、型番ＰＳＳ−１００）。この計測装置の検
出器は、フォトダイオードアレイよりなる受光素子アレ
イであり、波長のスペクトルモニタとして用いられてい
る。2. Description of the Related Art As a measuring device (spectral monitor) for measuring a continuous spectrum of light, light condensed by a condenser lens is reflected by a turning mirror, a continuous spectrum is formed by a diffraction grating, and a continuous spectrum is formed by a detector. A device for measuring a continuous spectrum of light is known (Shimadzu Corporation polychromator photometric system, model number PSS-100). The detector of this measuring device is a light receiving element array composed of a photodiode array, and is used as a wavelength spectrum monitor.
【０００３】[0003]
【発明が解決しようとする課題】上述した従来の計測装
置では、連続スペクトルを受光素子アレイで測定してい
るので、受光素子アレイのピッチによって測定できる波
長分解能が決まる。In the above-described conventional measuring apparatus, since the continuous spectrum is measured by the light receiving element array, the measurable wavelength resolution is determined by the pitch of the light receiving element array.
【０００４】他方、例えば波長多重伝送方式の光通信シ
ステムにおいて、人為的に間隔をあけた狭いスペクトル
幅の光が多重化された光を監視する場合、従来のように
単に受光素子を配列したのでは各チャンネルの信号とノ
イズとを明確に分離できない。なお、この明細書におい
て“ノイズ”とは、主として光をファイバ増幅器で発生
する各チャンネルのスペクトル幅の広がりや波長ずれな
どを言うものとする。On the other hand, for example, in a wavelength division multiplexing optical communication system, when monitoring light multiplexed with light having a narrow spectral width that is artificially spaced, a light receiving element is simply arranged as in the related art. In this case, the signal and noise of each channel cannot be clearly separated. In this specification, "noise" refers to the spread of the spectral width and wavelength shift of each channel in which light is mainly generated by a fiber amplifier.
【０００５】本発明の目的は、波長多重化された光の各
チャンネルの信号とノイズとを明確に分離できる光分波
器を提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical demultiplexer capable of clearly separating a signal of each channel of wavelength-multiplexed light from noise from noise.
【０００６】本発明の他の目的は、光分波器の検出器に
用いられる受光素子アレイを提供することにある。Another object of the present invention is to provide a light receiving element array used for a detector of an optical demultiplexer.
【０００７】[0007]
【課題を解決するための手段】光分波器は、前述したよ
うに例えば波長多重伝送方式の光通信システムにおい
て、受信側で多重伝送されてきた光を各波長毎に分離し
スペクトルを計測するデバイスとして用いられる。この
波長毎の集光点と受光素子アレイの各受光素子とがそれ
ぞれ対応するように配置されると、各波長毎の検出が行
える。As described above, in an optical communication system of, for example, a wavelength division multiplexing transmission system, an optical demultiplexer separates light multiplexed on a receiving side for each wavelength and measures a spectrum. Used as a device. If the light-collecting point for each wavelength and each light-receiving element of the light-receiving element array are arranged to correspond to each other, detection for each wavelength can be performed.
【０００８】各波長の信号強度を各波長に対応する１個
の受光素子でモニタすると同時に、光通信システムのフ
ァイバ増幅器で発生したノイズも、この信号モニタ用受
光素子に隣接する受光素子で検出する。このようにする
と、Ｎチャンネルの信号強度とノイズとが、直線状に配
列された約２Ｎ個の受光素子で測定できる。The signal intensity of each wavelength is monitored by one light receiving element corresponding to each wavelength, and at the same time, the noise generated in the fiber amplifier of the optical communication system is detected by the light receiving element adjacent to the signal monitoring light receiving element. . In this way, the signal strength and noise of the N channel can be measured by about 2N light receiving elements arranged linearly.
【０００９】このように、信号モニタ用の受光素子とノ
イズモニタ用の受光素子とを交互に配列し、隣接する受
光素子で各波長の信号とノイズを検出することにより、
分波光のモニタを行う。これによれば、信号モニタ用の
受光素子からの出力が低下し、ノイズモニタ用の受光素
子からの出力が増えれば、分波光のスペクトルに何らか
の異常が発生したことが分かる。この異常として、ピー
ク位置が低波長側あるいは高波長側へシフトしたこと、
スペクトルのピークが緩やかになりスペクトル自体がブ
ロードになったことなどが推定できる。また、信号モニ
タ用の受光素子からの出力が変化せず、ノイズモニタ用
の受光素子からの出力が増えれば、対応するチャンネル
のノイズが増加したことがモニタできる。このように、
信号モニタ用とノイズモニタ用の受光素子を交互に配置
することにより、ピーク位置のシフトやノイズの変化が
容易にモニタできる。As described above, the light receiving elements for signal monitoring and the light receiving elements for noise monitoring are alternately arranged, and the signal and noise of each wavelength are detected by the adjacent light receiving elements.
Monitors demultiplexed light. According to this, if the output from the light-receiving element for signal monitoring decreases and the output from the light-receiving element for noise monitoring increases, it is understood that some abnormality has occurred in the spectrum of the demultiplexed light. As this abnormality, the peak position shifted to the low wavelength side or high wavelength side,
It can be estimated that the peak of the spectrum becomes gentle and the spectrum itself becomes broad. In addition, if the output from the signal monitoring light receiving element does not change and the output from the noise monitoring light receiving element increases, it can be monitored that the noise of the corresponding channel has increased. in this way,
By alternately arranging light-receiving elements for signal monitoring and noise monitoring, shifts in peak positions and changes in noise can be easily monitored.
【００１０】[0010]
【発明の実施の形態】図１は、本発明に係る光分波器を
示す。この光分波器は、少なくとも、一本の入力ファイ
バ１０，コリメータレンズ１２，回折格子１４，検出器
１６を構成要素としている。このような構成の光分波器
では、入力ファイバ１０からの光をコリメータレンズ１
２を介して回折格子１４で分波してから、再度コリメー
タレンズ１２を介して収束された光を、検出器１６で検
出している。FIG. 1 shows an optical demultiplexer according to the present invention. This optical demultiplexer includes at least one input fiber 10, a collimator lens 12, a diffraction grating 14, and a detector 16 as components. In the optical demultiplexer having such a configuration, the light from the input fiber 10 is transmitted through the collimator lens 1.
The light that has been demultiplexed by the diffraction grating 14 via the diffraction grating 2 and then converged again by the collimator lens 12 is detected by the detector 16.
【００１１】なお、以下の説明では、図２に示すように
Ｎチャンネルの光が多重化された信号光をモニタする例
について示す。図２では、Ｌ1 ，Ｌ2 ，…，ＬN は、１
チャンネル目からＮチャンネル目までの各分波光を示し
ている。In the following description, an example of monitoring signal light in which N-channel light is multiplexed as shown in FIG. 2 will be described. In Figure 2, L 1, L 2, ..., L N is 1
Each of the demultiplexed lights from the channel to the N-th channel is shown.
【００１２】検出器１６には、本発明の受光素子アレイ
が用いられている。受光素子アレイの一実施例を、図３
に示す。図３には、受光素子アレイチップ２０が示され
ている。Ｎチャンネルの分波光をモニタするため、奇数
番目の信号モニタ用受光素子１，３，…，（２Ｎ−１）
と、偶数番目のノイズモニタ用受光素子２，４，…，２
Ｎとを交互に配列しており、分波光の２倍（２Ｎ個）の
受光素子を有している。この受光素子アレイでは、信号
モニタ用の受光素子で信号強度のモニタを用い、ノイズ
モニタ用の受光素子でノイズ強度のモニタを行う。The detector 16 uses the light receiving element array of the present invention. FIG. 3 shows an embodiment of the light receiving element array.
Shown in FIG. 3 shows the light receiving element array chip 20. In order to monitor the N-channel demultiplexed light, the odd-numbered signal monitoring light receiving elements 1, 3,..., (2N-1)
, And even-numbered light receiving elements for noise monitoring 2, 4,.
And N are alternately arranged, and have light receiving elements twice (2N) of the split light. In this light receiving element array, the signal intensity monitor is used as the signal monitoring light receiving element, and the noise intensity is monitored using the noise monitoring light receiving element.
【００１３】１チャンネル目の分波光は、受光素子１で
信号が、受光素子２でノイズがモニタされる。２チャン
ネル目の分波光は、受光素子３で信号を、受光素子２，
４でノイズをモニタされる。最後のＮチャンネル目の分
波光は、受光素子（２Ｎ−１）で信号を、受光素子（２
Ｎ−２），２Ｎでノイズをモニタされる。The signal of the demultiplexed light of the first channel is monitored by the light receiving element 1 and the noise is monitored by the light receiving element 2. The demultiplexed light of the second channel is converted into a signal by the light receiving element 3,
The noise is monitored at 4. The demultiplexed light of the last N channel is converted into a signal by the light receiving element (2N-1),
N-2), noise is monitored at 2N.
【００１４】このような受光素子アレイは、一例とし
て、拡散によりｐｉｎ構造を形成することにより作製で
きる。図４は、このようにして作製された受光素子アレ
イの断面の一部を示す。Such a light receiving element array can be manufactured, for example, by forming a pin structure by diffusion. FIG. 4 shows a part of a cross section of the light receiving element array manufactured as described above.
【００１５】ｎ−ＩｎＰ基板２２上に、ｎ−ＩｎＰ層２
４，ｉ−ＩｎＧａＡｓ層２６，ｎ−ＩｎＰ層２８が積層
され、ｎ−ＩｎＰ層２８内にＺｎが拡散され、ｐ型領域
３０が形成され、ｐｉｎフォトダイオードが作られる。
この場合、横方向にもＺｎ拡散が進むため、素子間隔を
一定以上に狭くすることができない。また、隣接する受
光素子への漏れ信号が発生するため、素子間隔に制限が
あり、５０μｍ以上のピッチに対して使用される。An n-InP layer 2 is formed on an n-InP substrate 22.
4, the i-InGaAs layer 26 and the n-InP layer 28 are stacked, Zn is diffused into the n-InP layer 28, the p-type region 30 is formed, and a pin photodiode is manufactured.
In this case, Zn diffusion proceeds in the lateral direction, so that the element interval cannot be reduced to a certain value or more. Further, since a leak signal is generated to an adjacent light receiving element, the distance between the elements is limited, and is used for a pitch of 50 μm or more.
【００１６】図５は、拡散によるｐｉｎフォトダイオー
ドにより形成された受光素子アレイ・チップの平面図で
ある。各受光素子３２は、配線３４により、対応するボ
ンディングパッド３６に接続されている。前述したよう
に、受光素子の間隔ｐ1 は、５０μｍ以上必要となる。FIG. 5 is a plan view of a light receiving element array chip formed by pin photodiodes formed by diffusion. Each light receiving element 32 is connected to a corresponding bonding pad 36 by a wiring 34. As described above, the interval p 1 between the light receiving elements needs to be 50 μm or more.
【００１７】受光素子アレイを作製する他の例を説明す
る。図６は、受光素子を分離エッチングしたメサ型構造
の受光素子アレイの断面図である。Another example of manufacturing a light receiving element array will be described. FIG. 6 is a cross-sectional view of a light-receiving element array having a mesa structure in which light-receiving elements are separately etched.
【００１８】ｎ−ＩｎＰ基板２２上に、ｎ−ＩｎＰ層２
４，ｉ−ＩｎＧａＡｓ層２６，ｐ−ＩｎＰ層３８が積層
され、ＩｎＧａＡｓ層２６とＩｎＰ層３８とをエッチン
グして素子間を分離して、ｐｉｎフォトダイオードを形
成している。これによれば、図４の構造で問題となる、
横方向への拡散による受光素子間の間隔の制限を回避で
き、高精細の受光素子アレイ、例えば、２５μｍピッ
チ，１０μｍピッチの受光素子アレイを実現できる。ま
た、この構造では、隣接素子への漏れ信号を抑制でき
る。On the n-InP substrate 22, an n-InP layer 2
4, the i-InGaAs layer 26 and the p-InP layer 38 are stacked, and the InGaAs layer 26 and the InP layer 38 are etched to separate elements from each other to form a pin photodiode. According to this, a problem occurs in the structure of FIG.
The limitation of the interval between the light receiving elements due to the diffusion in the lateral direction can be avoided, and a high-definition light receiving element array, for example, a light receiving element array having a pitch of 25 μm or 10 μm can be realized. Further, in this structure, a leakage signal to an adjacent element can be suppressed.
【００１９】図７は、メサ型構造の受光素子アレイ・チ
ップの平面図である。前述したように素子の間隔ｐ2
を、１０μｍというように小さくすることができる。FIG. 7 is a plan view of a light receiving element array chip having a mesa structure. As described above, the element spacing p 2
Can be made as small as 10 μm.
【００２０】図８は、Ｎチャンネルの信号とノイズを分
離して検出する回路を示す。この検出回路は、各信号モ
ニタ用受光素子１，３，…，（２Ｎ−１）に一方の入力
端子が接続された信号モニタ用差動増幅器Ｄ1 ，Ｄ3 ，
…，Ｄ2N-1と、各ノイズモニタ用受光素子２，４，…，
２Ｎに一方の入力端子が接続されたノイズモニタ用差動
増幅器Ｄ2 ，Ｄ4 ，…，Ｄ2Nと、これら差動増幅器の出
力が入力される信号・ノイズモニタ出力部４０とから構
成されている。なお、信号モニタ用差動増幅器Ｄ1 ，Ｄ
3 ，…，Ｄ2N-1の他方の入力端子には、基準レベルＩ
ref が、ノイズモニタ用差動増幅器Ｄ2 ，Ｄ4 ，…，Ｄ
2Nの他方の入力端子には、基準レベルＮre f が入力され
る。これら基準レベルを基に信号およびノイズのモニタ
を行う。FIG. 8 shows a circuit for separating and detecting N-channel signals and noise. This detection circuit includes signal monitoring differential amplifiers D 1 , D 3 , D 1 , D 3 , each having one input terminal connected to each signal monitoring light receiving element 1, 3,..., (2N−1).
, D 2N-1 and each noise monitoring light receiving element 2, 4, ...,
Differential amplifier for one of the noise monitor input terminal connected to the 2N D 2, D 4, ... , is composed of a D 2N, signal noise monitor output unit 40 for outputting the differential amplifiers are input I have. The signal monitoring differential amplifiers D 1 and D 1
3, ..., to the other input terminal of the D 2N-1, the reference level I
ref is the noise monitor differential amplifier D 2 , D 4 ,.
The other input terminal of 2N, the reference level N re f is input. The signal and noise are monitored based on these reference levels.
【００２１】次に、本発明に係る光分波器の動作を説明
する。入力ファイバ１０からの波長多重信号光を、コリ
メータレンズ１２を介して回折格子１４で分波し、再度
コリメータレンズ１２を介して検出器１６上に収束させ
る。図９は、全ての分波光が、スペクトル幅の広がりや
波長ずれを起こすことなく信号モニタ用の受光素子に入
射している状態を示している。この場合、図８の検出回
路の各差動増幅器からは信号が出力されず、信号・ノイ
ズモニタ出力部４０では、スペクトル幅の広がりや信号
ずれを検出しない。Next, the operation of the optical demultiplexer according to the present invention will be described. The wavelength multiplexed signal light from the input fiber 10 is split by the diffraction grating 14 via the collimator lens 12 and converged on the detector 16 via the collimator lens 12 again. FIG. 9 shows a state in which all the demultiplexed light is incident on the signal monitoring light receiving element without causing the spread of the spectrum width or the wavelength shift. In this case, no signal is output from each differential amplifier of the detection circuit of FIG. 8, and the signal / noise monitor output unit 40 does not detect the spread of the spectrum width or the signal shift.
【００２２】これに対し、図１０は、分波光Ｌ1 のピー
ク波長が正常値からシフトしたことを示している。ピー
ク位置がシフトすると、図示の分波光Ｌ1 のシフト状態
から分かるように、信号モニタ用の受光素子１の検出出
力が減少し、それとは逆に、ノイズモニタ用の受光素子
２の検出出力が増加する。[0022] In contrast, FIG. 10, the peak wavelength of the demultiplexed light L 1 indicates that it has shifted from a normal value. When the peak position is shifted, as can be seen from the frequency shift states of the wave beam L 1 shown, detects the output of the light receiving element 1 of the signal monitor decreases, the contrary, the detection output of the light receiving element 2 for noise monitor To increase.
【００２３】差動増幅器Ｄ1 は、受光素子１の信号出力
から基準レベルＩref を減算し、その値を信号として出
力する。また、差動増幅器Ｄ2 は、受光素子２のノイズ
出力から基準レベルＮref を減算し、その値をノイズと
して出力する。信号・ノイズモニタ出力部４０では、差
動増幅器Ｄ1 ，Ｄ2 の出力から、分波光Ｌ1 のピーク位
置がシフトしている、すなわち信号ずれを検出する。The differential amplifier D 1 subtracts the reference level Iref from the signal output of the light receiving element 1 and outputs the value as a signal. The differential amplifier D 2 subtracts the reference level N ref from the noise output of the light receiving element 2, and outputs the value as a noise. The signal noise monitoring output unit 40, from the output of the differential amplifier D 1, D 2, the peak position of the demultiplexed light L 1 is shifted, i.e., detects a signal deviation.
【００２４】以上の実施例で説明した図３の受光素子ア
レイチップでは、奇数番目の受光素子を信号モニタ用、
偶数番目の受光素子をノイズモニタ用としたが、逆にし
てもよい。In the light receiving element array chip of FIG. 3 described in the above embodiment, the odd-numbered light receiving elements are used for signal monitoring,
The even-numbered light receiving elements are used for noise monitoring, but may be reversed.
【００２５】また、図３では、簡単のために、２Ｎ個の
受光素子で説明したが、２Ｎ個以上を有する受光素子ア
レイを用いて、この中の２Ｎ個を用いてもよい。In FIG. 3, 2N light receiving elements have been described for simplicity. However, a light receiving element array having 2N or more light receiving elements may be used, and 2N light receiving elements may be used.
【００２６】また、（２Ｎ＋１）個の受光素子を用い
て、受光素子アレイの両端に必ずノイズモニタ用の受光
素子が入るよう配列すれば、１チャンネル目と最終チャ
ンネル目のノイズモニタを更に良好に行える。図３で説
明すると、１番目の受光素子１の左にも受光素子を設
け、この受光素子と２番目の受光素子２で１チャンネル
目の分波光Ｌ1 のノイズモニタを行ってもよい。Further, if (2N + 1) light receiving elements are arranged so that light receiving elements for noise monitoring are always provided at both ends of the light receiving element array, the noise monitoring of the first channel and the last channel can be further improved. I can do it. With reference to FIG. 3, also provided a light-receiving element to the first left light receiving element 1 may be subjected to the light receiving element and the second partial noise monitor wave light L 1 for the first channel in the light-receiving element 2.
【００２７】また、各チャンネル間のノイズを主にモニ
タしたい場合は、Ｎ個の信号モニタ用の受光素子で信号
をモニタし、Ｎ−１個のノイズモニタ用の受光素子でチ
ャンネル間のノイズをモニタできるので、２Ｎ−１個の
受光素子を用いればよい。When it is desired to mainly monitor the noise between the channels, the signal is monitored by N light-receiving elements for signal monitoring, and the noise between the channels is monitored by N-1 light-receiving elements for noise monitoring. Since monitoring can be performed, 2N-1 light receiving elements may be used.
【図１】本発明に係る光分波器の構成を示す図である。FIG. 1 is a diagram showing a configuration of an optical demultiplexer according to the present invention.
【図２】Ｎチャンネルの光が多重化された信号光を示す
図である。FIG. 2 is a diagram illustrating signal light in which N-channel light is multiplexed.
【図３】受光素子アレイの一実施例を示す図である。FIG. 3 is a diagram showing one embodiment of a light receiving element array.
【図４】Ｚｎ拡散により形成された受光素子アレイの断
面図である。FIG. 4 is a sectional view of a light receiving element array formed by Zn diffusion.
【図５】図４の受光素子アレイの平面図である。FIG. 5 is a plan view of the light receiving element array of FIG.
【図６】受光素子を分離エッチングしたメサ型構造の受
光素子アレイの断面図である。FIG. 6 is a cross-sectional view of a light-receiving element array having a mesa structure in which light-receiving elements are separately etched.
【図７】メサ型構造の受光素子アレイの平面図である。FIG. 7 is a plan view of a light-receiving element array having a mesa structure.
【図８】Ｎチャンネルの信号とノイズを分離して検出す
る回路を示す図である。FIG. 8 is a diagram showing a circuit for separating and detecting an N-channel signal and noise.
【図９】全ての分波光が、スペクトル幅の広がりや波長
ずれを起こすことなく信号モニタ用の受光素子に入射し
ている状態を示す図である。FIG. 9 is a diagram showing a state in which all split light beams are incident on a signal monitoring light receiving element without causing a spread of a spectrum width or a wavelength shift.
【図１０】分波光Ｌ1 のピーク波長が正常値からシフト
したことを示す図である。Peak wavelength of FIG. 10 and demultiplexing light L 1 is a diagram showing that it has shifted from a normal value.
１０ 入力ファイバ １２ コリメータレンズ １４ 回折格子 １６ 検出器 ２０ 受光素子アレイチップ ２２ ｎ−ＩｎＰ基板 ２４ ｎ−ＩｎＰ層 ２６ ｉ−ＩｎＧａＡｓ層 ２８ ｎ−ＩｎＰ層 ３０ ｐ型領域 ３２ 受光素子 ３４ 配線 ３６ ボンディングパッド ３８ ｐ−ＩｎＰ層 ４０ 信号・ノイズモニタ出力部 Reference Signs List 10 input fiber 12 collimator lens 14 diffraction grating 16 detector 20 light receiving element array chip 22 n-InP substrate 24 n-InP layer 26 i-InGaAs layer 28 n-InP layer 30 p-type region 32 light receiving element 34 wiring 36 bonding pad 38 p-InP layer 40 signal / noise monitor output unit
Claims (9)
る光分波器において、 多重された波長の光を分波し、分波光ごとに信号とノイ
ズとを分離してモニタすることを特徴とする光分波器。1. An optical demultiplexer for monitoring the spectrum of wavelength-multiplexed light, wherein the light having a wavelength multiplexed is demultiplexed and a signal and noise are separated and monitored for each demultiplexed light. Optical demultiplexer.
る光分波器において、 多重された波長の光を分波する回折格子と、 分波された光を、分波光ごとに信号とノイズとを分離し
て受光する受光素子と、を備えることを特徴とする光分
波器。2. An optical demultiplexer for monitoring the spectrum of wavelength-multiplexed light, comprising: a diffraction grating for demultiplexing the light of the multiplexed wavelength; and a signal and noise for each demultiplexed light. And a light receiving element that separates and receives light.
の整数）の信号モニタ用の受光素子と、Ｎ個のノイズモ
ニタ用の受光素子とが、交互に直線状に配列されている
ことを特徴とする請求項２記載の光分波器。3. The light receiving element array comprises N (N is an integer of 2 or more) signal monitoring light receiving elements and N noise monitoring light receiving elements, which are alternately linearly arranged. The optical demultiplexer according to claim 2, wherein
の整数）の信号モニタ用の受光素子と、（Ｎ＋１）個の
ノイズモニタ用の受光素子とからなり、ノイズモニタ用
の受光素子の間に、１つずつ信号モニタ用の受光素子が
配置されて、直線状に配列されていることを特徴とする
請求項２記載の光分波器。4. The light-receiving element array includes N (N is an integer of 2 or more) signal monitoring light-receiving elements and (N + 1) noise monitoring light-receiving elements. 3. The optical demultiplexer according to claim 2, wherein light receiving elements for signal monitoring are arranged one by one between the elements, and are arranged linearly.
の整数）信号モニタ用の受光素子と、（Ｎ−１）個のノ
イズモニタ用の受光素子とからなり、信号モニタ用の受
光素子の間に、１つずつノイズモニタ用の受光素子が配
置されて、直線状に配列されていることを特徴とする請
求項２記載の光分波器。5. The light-receiving element array includes N (N is an integer of 2 or more) signal monitoring light-receiving elements and (N-1) noise monitoring light-receiving elements. 3. The optical demultiplexer according to claim 2, wherein one light-receiving element for noise monitoring is arranged between the light-receiving elements and arranged linearly.
信号とノイズとを分離してモニタする光分波器の受光素
子アレイにおいて、 Ｎ個（Ｎは２以上の整数）の信号モニタ用の受光素子
と、Ｎ個のノイズモニタ用の受光素子とが、交互に直線
状に配列されていることを特徴とする受光素子アレイ。6. A light receiving element array of an optical demultiplexer for demultiplexing wavelength-multiplexed light and separating and monitoring signals and noise for each demultiplexed light, wherein N (N is an integer of 2 or more) A light-receiving element array, wherein light-receiving elements for signal monitoring and N light-receiving elements for noise monitoring are alternately arranged in a straight line.
信号とノイズとを分離してモニタする光分波器の受光素
子アレイにおいて、 Ｎ個（Ｎは２以上の整数）の信号モニタ用の受光素子
と、（Ｎ＋１）個のノイズモニタ用の受光素子とからな
り、ノイズモニタ用の受光素子の間に、１つずつ信号モ
ニタ用の受光素子が配置されて、直線状に配列されてい
ることを特徴とする受光素子アレイ。7. A light-receiving element array of an optical demultiplexer for demultiplexing wavelength-multiplexed light and separating and monitoring a signal and noise for each demultiplexed light, wherein N (N is an integer of 2 or more) It comprises a light receiving element for signal monitoring and (N + 1) light receiving elements for noise monitoring. Light receiving elements for signal monitoring are arranged one by one between the light receiving elements for noise monitoring. A light-receiving element array, which is arranged.
信号とノイズとを分離してモニタする光分波器の受光素
子アレイにおいて、 Ｎ個（Ｎは２以上の整数）信号モニタ用の受光素子と、
（Ｎ−１）個のノイズモニタ用の受光素子とからなり、
信号モニタ用の受光素子の間に、１つずつノイズモニタ
用の受光素子が配置されて、直線状に配列されているこ
とを特徴とする受光素子アレイ。8. A light receiving element array of an optical demultiplexer for demultiplexing wavelength-multiplexed light and separating and monitoring a signal and noise for each demultiplexed light, wherein N (N is an integer of 2 or more) signals A light receiving element for monitoring;
(N-1) light receiving elements for noise monitoring,
A light-receiving element array, wherein one noise-monitoring light-receiving element is arranged between each signal-monitoring light-receiving element, and is linearly arranged.
イズモニタ用の受光素子は、ｐｉｎフォトダイオードよ
りなることを特徴とする請求項６，７または８記載の受
光素子アレイ。9. The light-receiving element array according to claim 6, wherein said light-receiving element for signal monitoring and said light-receiving element for noise monitoring comprise pin photodiodes.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28776499A JP3683445B2 (en) | 1999-10-08 | 1999-10-08 | Optical demultiplexer |
| CN00802203A CN1327532A (en) | 1999-10-08 | 2000-10-05 | Photodetector array and optical branching filter using the array |
| US09/857,634 US7062178B1 (en) | 1999-10-08 | 2000-10-05 | Photodetector array and optical branching filter using the array |
| EP00964677A EP1156311A1 (en) | 1999-10-08 | 2000-10-05 | Photodetector array and optical branching filter using the array |
| PCT/JP2000/006938 WO2001027573A1 (en) | 1999-10-08 | 2000-10-05 | Photodetector array and optical branching filter using the array |
| CA002354267A CA2354267A1 (en) | 1999-10-08 | 2000-10-05 | Light-receiving element array and optical demultiflexer using the same |
| TW089120867A TW477076B (en) | 1999-10-08 | 2000-10-06 | Photodetector array and optical branching filter using the array |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28776499A JP3683445B2 (en) | 1999-10-08 | 1999-10-08 | Optical demultiplexer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001108524A true JP2001108524A (en) | 2001-04-20 |
| JP3683445B2 JP3683445B2 (en) | 2005-08-17 |
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ID=17721462
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28776499A Expired - Lifetime JP3683445B2 (en) | 1999-10-08 | 1999-10-08 | Optical demultiplexer |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007139578A (en) * | 2005-11-18 | 2007-06-07 | Yokogawa Electric Corp | Wdm signal monitor |
| US7557336B2 (en) | 2006-05-10 | 2009-07-07 | Hamamatsu Photonics K.K. | Photodetector having first and second antenna areas with patterns having different cycle intervals |
-
1999
- 1999-10-08 JP JP28776499A patent/JP3683445B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007139578A (en) * | 2005-11-18 | 2007-06-07 | Yokogawa Electric Corp | Wdm signal monitor |
| US7557336B2 (en) | 2006-05-10 | 2009-07-07 | Hamamatsu Photonics K.K. | Photodetector having first and second antenna areas with patterns having different cycle intervals |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3683445B2 (en) | 2005-08-17 |
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