JP2007201043A - Optical transmitter and optical transceiver - Google Patents

Optical transmitter and optical transceiver Download PDF

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JP2007201043A
JP2007201043A JP2006015996A JP2006015996A JP2007201043A JP 2007201043 A JP2007201043 A JP 2007201043A JP 2006015996 A JP2006015996 A JP 2006015996A JP 2006015996 A JP2006015996 A JP 2006015996A JP 2007201043 A JP2007201043 A JP 2007201043A
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optical
light emitting
emitting element
optical transmitter
signal
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Yoichi Motosawa
陽一 本澤
Noriki Takeda
准樹 武田
Toru Oyama
徹 大山
Tomonobu Kondo
知信 近藤
Antony Cleitus
クライタス アントニー
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Opnext Japan Inc
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Opnext Japan Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical transmitter of long life which has a stable transmission characteristics for an extended period. <P>SOLUTION: The life of an optical transmitter 500 depends on degradation in characteristics due to aging of a light emitting element 211 mounted on it. In order to correct degradation in characteristics of the light emitting element 211, a self-correction mode is added to the optical transmitter 500 to measure light emission characteristics of the light emitting elements 211. The life of the optical transmitter 500 can be extended by repeating correction of characteristic degradation due to aging of the light emitting element 211. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、光送信器および光送受信器に係り、特に長寿命な動作を要求される光送信器および光送受信器に関する。   The present invention relates to an optical transmitter and an optical transmitter / receiver, and more particularly to an optical transmitter and an optical transmitter / receiver that require a long-life operation.

特許文献１には、入力電圧信号を受けて波形整形する差動増幅器、この差動増幅器の出力信号を受けて発光素子を駆動する為の変調電流を発生する差動型電流スイッチ、この差動型電流スイッチの電流振幅を変える可変電流源で構成された変調駆動回路と、この発光素子の直流バイアス電流を供給する平均出力光制御・駆動回路で構成され、このうち可変電流源はレーザダイオードの光出力電力の設定や発光効率特性に応じて調整される光送信器が記載されている。   Patent Document 1 discloses a differential amplifier that receives an input voltage signal and shapes a waveform, a differential current switch that receives a signal output from the differential amplifier and generates a modulation current for driving a light emitting element, and the differential A modulation drive circuit composed of a variable current source that changes the current amplitude of the current switch, and an average output light control / drive circuit that supplies a DC bias current of the light emitting element. An optical transmitter that is adjusted according to the setting of light output power and light emission efficiency characteristics is described.

特開平５−２１８５４３号公報JP-A-5-218543

インターネットの普及等による伝送量の増大に伴い、光伝送装置の設置数も増え、それに伴い、その保守に要する費用、時間も増大している。光送受信器の寿命を延ばすことにより、光送受信器が搭載されている光伝送装置の保守費用、時間を低減することが可能となる。光送受信器に搭載されている全ての部品の中で最も経年による特性劣化が大きいものが発光素子である。発光素子の特性劣化によって、光送信器が満足する特性が提供できなくなった時点が光送信器としての寿命となる。発光素子の特性劣化で顕著なものは、スロープ効率の減少と閾値電流の増加である。   As the amount of transmission increases due to the spread of the Internet and the like, the number of installed optical transmission devices also increases, and accordingly, the cost and time required for the maintenance also increase. By extending the lifetime of the optical transceiver, it is possible to reduce the maintenance cost and time of the optical transmission apparatus in which the optical transceiver is mounted. Among all the components mounted on the optical transceiver, the light emitting element has the greatest deterioration in characteristics due to aging. The point in time when the optical transmitter can no longer provide satisfactory characteristics due to the deterioration of the characteristics of the light emitting element is the lifetime of the optical transmitter. What is remarkable in the characteristic deterioration of the light emitting element is a decrease in slope efficiency and an increase in threshold current.

本発明によって、長時間安定した送信特性の得られる光送信器および光送受信器を提供する。   According to the present invention, an optical transmitter and an optical transmitter / receiver which can obtain transmission characteristics stable for a long time are provided.

送信電気信号を変調信号に変換して発光素子を駆動する変調駆動部と、前記発光素子と、前記発光素子の出力をモニタして出力パワー一定制御する出力制御部とからなり、前記制御部は発光素子のスロープ効率を測定する光送信器により、達成できる。   A modulation driving unit that converts a transmission electric signal into a modulation signal to drive a light emitting element, the light emitting element, and an output control unit that monitors the output of the light emitting element and controls output power constant, and the control unit includes: This can be achieved by an optical transmitter that measures the slope efficiency of the light emitting element.

また、送信電気信号を送信光信号に変換する光送信部と、受信光信号を受信電気信号に変換する光受信部で構成し、光送信部の光出力の一部を、光受信部の光入力に戻す光路を有する光送受信器により、達成できる。   Further, the optical transmission unit configured to convert the transmission electrical signal into a transmission optical signal and the optical reception unit configured to convert the reception optical signal into a reception electrical signal, a part of the optical output of the optical transmission unit is used as the light of the optical reception unit. This can be achieved with an optical transceiver having an optical path back to the input.

本発明に拠れば、長時間安定した送信特性を有する光送信器または光送受信器を得ることができる。   According to the present invention, it is possible to obtain an optical transmitter or an optical transmitter / receiver having stable transmission characteristics for a long time.

以下本発明の実施の形態について、実施例を用いて図面を参照して説明する。なお、同一部位には同じ参照番号を振り説明は繰り返さない。   Hereinafter, embodiments of the present invention will be described with reference to the drawings using examples. Note that the same reference numerals are assigned to the same parts and the description will not be repeated.

実施例１を図１ないし図３を用いて説明する。ここで、図１は、光送信器のブロック図である。図２（ａ）はスロープ効率の稼動時間依存性を説明する図である。また、図２（ｂ）は閾値電流の稼動時間依存性を説明する図である。図３（ａ）は初回の自動補正モードを説明する図である。図３（ｂ）は第２回の自動補正モードを説明する図である。   A first embodiment will be described with reference to FIGS. Here, FIG. 1 is a block diagram of an optical transmitter. FIG. 2A is a diagram for explaining the dependence of slope efficiency on the operating time. FIG. 2B is a diagram for explaining the operating time dependency of the threshold current. FIG. 3A illustrates the first automatic correction mode. FIG. 3B is a diagram for explaining the second automatic correction mode.

図１において、光送信器５００は、送信電気信号に基づいて発光素子２１１を駆動する変調駆動回路２１２と、発光素子２１１の近傍に置かれたサーミスタを含む発光素子温度モニタ回路２１６と、発光素子２１１の後方出力光をモニタするモニタ光受光素子２１４と、モニタ項受光素子２１４からの信号を受信し発光素子２１１の出力を制御する平均光出力制御・駆動回路２１５と、演算器４１７と、演算器４１７と接続された記憶媒体（メモリ）４２０と、変調駆動回路２１２の駆動電流を制御する変調駆動電流制御回路２１３とにより構成される。   In FIG. 1, an optical transmitter 500 includes a modulation driving circuit 212 that drives a light emitting element 211 based on a transmission electric signal, a light emitting element temperature monitor circuit 216 that includes a thermistor placed in the vicinity of the light emitting element 211, and a light emitting element. A monitor light receiving element 214 that monitors the rear output light of 211, an average light output control / drive circuit 215 that receives a signal from the monitor light receiving element 214 and controls the output of the light emitting element 211, an arithmetic unit 417, and an operation And a modulation drive current control circuit 213 that controls the drive current of the modulation drive circuit 212.

ここで、発光素子２１１は光送信器に搭載前に、初期特性として光送信器の動作保証温度内の複数の温度で、スロープ効率と閾値電流特性を測定しておく。発光素子２１１の特性は温度に依存するので、多数の温度条件にて測定する必要がある。それぞれの温度でのスロープ効率と閾値電流のデータを記憶媒体４２０に記録する。ここで温度条件の数は、発光素子の温度変動による特性変動が小さいもののは少なくても構わない。しかし、温度変動による特性変動が大きいものは多くする必要がある。ここで温度条件数を多くすることにより、補正の精度が向上する。   Here, before mounting the light emitting element 211 on the optical transmitter, the slope efficiency and the threshold current characteristic are measured at a plurality of temperatures within the guaranteed operating temperature of the optical transmitter as initial characteristics. Since the characteristics of the light-emitting element 211 depend on temperature, it is necessary to measure under a large number of temperature conditions. Slope efficiency and threshold current data at each temperature are recorded in the storage medium 420. Here, the number of temperature conditions may be small if the characteristic variation due to the temperature variation of the light emitting element is small. However, it is necessary to increase the number of characteristic fluctuations due to temperature fluctuations. Here, the accuracy of correction is improved by increasing the number of temperature conditions.

記憶媒体４２０には、加えて図２に示す特性劣化曲線を記録する。図２から明らかなようにスロープ効率ηは、稼働時間と共に低下する。一方、閾値電流Ｉthは、稼働時間と共に増加する。記憶媒体４２０に記録する劣化特性は、多数の発光素子を測定し、ばらつきを考慮した最悪条件である。記憶媒体４２０には、さらにスロープ効率の限界値ηlifeと閾値電流の限界値Ｉthlifeを記録する。   In addition, the characteristic deterioration curve shown in FIG. 2 is recorded in the storage medium 420. As apparent from FIG. 2, the slope efficiency η decreases with the operating time. On the other hand, the threshold current Ith increases with the operating time. The deterioration characteristic recorded in the storage medium 420 is the worst condition in which many light emitting elements are measured and variation is taken into consideration. The storage medium 420 further records a slope efficiency limit value ηlife and a threshold current limit value Ithlife.

光送信器５００には、通常モードと自己補正モードとがある。光送信器５００が、自己補正モードで動作するのは、外部から演算器４１７に入力されるモード切替信号を自己補正モードに切替えるかあるいは、前もって決定された条件で演算器内部信号で自己補正モードに切替わった時である。光送信器５００の稼動後、初めての自己補正モードでの動作について説明する。   The optical transmitter 500 has a normal mode and a self-correction mode. The optical transmitter 500 operates in the self-correction mode because the mode switching signal input from the outside to the calculator 417 is switched to the self-correction mode, or the self-correction mode is set based on the internal signal of the calculator under a predetermined condition. It is when it switches to. The operation in the first self-correction mode after the operation of the optical transmitter 500 will be described.

自己補正モードに切替わると、まず変調駆動回路２１２が動作しないように変調駆動電流制御回路２１３が参照する制御信号ｂの値を決定する。その後平均出力制御・駆動回路２１５が参照する制御信号ａを変動させ、発光素子のスロープ効率と閾値電流特性の測定を行う。   When the self-correction mode is switched, first, the value of the control signal b referred to by the modulation drive current control circuit 213 is determined so that the modulation drive circuit 212 does not operate. Thereafter, the control signal a referred to by the average output control / drive circuit 215 is varied, and the slope efficiency and threshold current characteristics of the light emitting element are measured.

具体的には、まずモニタ光受光素子２１４に入力される光が無くなる制御信号ａを求める。その後、制御信号ａを任意の刻みで変更し、その際のモニタ光受光素子２１４に入力される光パワー対平均光出力制御・駆動回路２１５で駆動された電流値を測定する。演算器４１７は測定した値からスロープ効率と閾値電流を算出する。それらの値と、発光素子温度モニタ回路２１６でモニタされた温度と、自己補正モードに切替わるまでの積算稼動時間を記憶媒体４２０に記録する。   Specifically, first, a control signal a that eliminates the light input to the monitor light receiving element 214 is obtained. Thereafter, the control signal a is changed in arbitrary increments, and the current value driven by the average power output control / drive circuit 215 input to the monitor light receiving element 214 at that time is measured. The calculator 417 calculates the slope efficiency and the threshold current from the measured values. These values, the temperature monitored by the light emitting element temperature monitor circuit 216, and the accumulated operation time until switching to the self-correction mode are recorded in the storage medium 420.

算出されたスロープ効率と閾値電流と記憶媒体４２０に記録していた発光素子温度モニタ回路２１６でモニタされた温度時あるいは最も近い温度の初期特性とを比較し、その劣化分を演算器４１７で算出する。その算出値から通常モード時の制御信号ｂの値の補正を行う。次に、補正された制御信号ｂの値ので光送受信器が正常な特性を提供できるスロープ効率ηlimit１を求める。   The calculated slope efficiency, threshold current, and initial characteristics at the temperature or the closest temperature monitored by the light emitting element temperature monitor circuit 216 recorded in the storage medium 420 are compared, and the deterioration is calculated by the calculator 417. To do. The value of the control signal b in the normal mode is corrected from the calculated value. Next, the slope efficiency ηlimit1 at which the optical transceiver can provide normal characteristics based on the corrected value of the control signal b is obtained.

記憶媒体４２０に記録されたスロープ効率の特性劣化曲線を現在のスロープ効率ηnow１に当てはめ、スロープ効率がηlimit１になる稼動積算時間Ｔηlimit１、スロープ効率がηlifeになる稼動積算時間Ｔηlifeを算出する。またＴηlimit１の値から、次に自己補正モードをする稼動積算時間Ｔnext１を算出する。Ｔηlimit１、Ｔηlife、Ｔnext１等のデータを記憶媒体４２０に記録するとともに、そのデータを外部に出力し、通常モードに切替える。制御信号ｂは自己補正モード時に補正された値となり、発光素子の経年による特性劣化が補正され、送信光信号は稼動前と同等の特性を示す。   A slope efficiency characteristic deterioration curve recorded in the storage medium 420 is applied to the current slope efficiency ηnow1, and an operation integration time Tηlimit1 at which the slope efficiency becomes ηlimit1 and an operation integration time Tηlife at which the slope efficiency becomes ηlife are calculated. Further, from the value of Tηlimit1, the operation integration time Tnext1 for the next self-correction mode is calculated. Data such as Tηlimit1, Tηlife, and Tnext1 is recorded in the storage medium 420, and the data is output to the outside to switch to the normal mode. The control signal b becomes a value corrected in the self-correction mode, the characteristic deterioration due to aging of the light emitting element is corrected, and the transmitted optical signal exhibits the same characteristic as before operation.

積算稼動時間がＴnext１になった際、再び、外部から入力されるモード切替信号によって、あるいは自動的に自己補正モードに切替わる。初回と同様な動作を繰り返すが、図３（ｂ）に示すように発光素子の特性劣化曲線を測定したデータより補正し、発光素子の特性に合致させる。同様な動作を２回、３回…Ｎ回と繰り返す。   When the integrated operation time reaches Tnext1, the mode is again switched to the self-correction mode by a mode switching signal input from the outside or automatically. The same operation as the first time is repeated, but as shown in FIG. 3B, the characteristic deterioration curve of the light emitting element is corrected based on the measured data to match the characteristic of the light emitting element. The same operation is repeated twice, three times, N times.

なお、実施例１は、図１に示すモニタ光受光素子と平均光出力制御・駆動回路を用いて発光素子を自動パワーコントロール（ＡＰＣ：Automatic Power Control）しているので、閾値電流の特性劣化曲線は、利用していない。
本実施例に拠れば、長時間安定した送信特性を有する光送信器を得ることができる。 In Example 1, the monitor light receiving element and the average light output control / drive circuit shown in FIG. 1 are used to perform automatic power control (APC: Automatic Power Control) of the light emitting element. Is not used.
According to the present embodiment, an optical transmitter having stable transmission characteristics for a long time can be obtained.

実施例２を図３ないし図６を用いて説明する。ここで、図４は光送受信器の構成を示すブロック図である。図５は光送信部の構成を示すブロック図である。図６は発光素子の閾値電流の稼働限界推定を説明する図である。   A second embodiment will be described with reference to FIGS. Here, FIG. 4 is a block diagram showing the configuration of the optical transceiver. FIG. 5 is a block diagram showing the configuration of the optical transmitter. FIG. 6 is a diagram for explaining operation limit estimation of the threshold current of the light emitting element.

図４において、光送受信器１０１は、光送信部５０１と、光受信部６００と、光送信部５０１の出力光を９５対５の比で分岐する光カプラ４０１と、光カプラ４０１からの分岐比５の光を入力として、光カプラ４０２に出力する光スイッチ４０３と、受信光を入力され光カプラ４０２に出力する光スイッチ４０４と、光スイッチ４０３と光スイッチ４０４とからの光をカップリングする光カプラ４０２とで構成される。光送信部５０１は光スイッチ４０３と光スイッチ４０４とを制御する。また、光送信部５０１は送信電気信号、モード切替信号光受信部からの平均電流信号を受信する。光受信部６００は受信電気信号を出力する。   In FIG. 4, an optical transceiver 101 includes an optical transmitter 501, an optical receiver 600, an optical coupler 401 that branches the output light of the optical transmitter 501 at a ratio of 95: 5, and a branching ratio from the optical coupler 401. 5, an optical switch 403 that outputs to the optical coupler 402, an optical switch 404 that receives received light and outputs it to the optical coupler 402, and a light that couples light from the optical switch 403 and the optical switch 404. And a coupler 402. The optical transmission unit 501 controls the optical switch 403 and the optical switch 404. The optical transmission unit 501 receives the transmission electric signal and the average current signal from the mode switching signal optical reception unit. The optical receiver 600 outputs a received electrical signal.

光送受信器６００には、通常モードと自己補正モードとがある。光送受信器６００が、自己補正モードで動作するとき、光送信部５０１は、光スイッチ４０３をＯＮし、光スイッチ４０４をＯＦＦする。その結果、光受信部６００は光送信部５０１の出力をモニタすることになる。これについて図５を参照して説明する。   The optical transceiver 600 has a normal mode and a self-correction mode. When the optical transceiver 600 operates in the self-correction mode, the optical transmission unit 501 turns on the optical switch 403 and turns off the optical switch 404. As a result, the optical receiver 600 monitors the output of the optical transmitter 501. This will be described with reference to FIG.

図５において、実施例２は光送信部５０１内には受光素子がないため、光受信部６００を使用する点と、光送信部５０１がＡＰＣ回路を使用していない点が実施例１と異なる。光受信部を使用するために、図４に示す光送信部５０１の光出力を光受信部６００に折り返す光路を有する。自己補正モード時は、図５に示す光スイッチ４０３をＯＮ、光スイッチ４０４をＯＦＦにし、光受信部６００に光送信部５０１の出力が入力されるようにする。光受信部６００に搭載された平均電流検出回路３１２より、受光素子３１１に入力される平均光パワー値の計測に使用する。その他動作は、実施例１とほぼ同じである。しかし、図４に示す光送信部５０１はＡＰＣ回路が搭載されていないため、制御信号ａの補正も必要となる。制御信号ｂの補正と同様な方法で制御信号ａの補正を行う。   In FIG. 5, the second embodiment is different from the first embodiment in that there is no light receiving element in the optical transmitter 501, so that the optical receiver 600 is used and the optical transmitter 501 does not use an APC circuit. . In order to use the optical receiver, an optical path for turning back the optical output of the optical transmitter 501 shown in FIG. 4 to the optical receiver 600 is provided. In the self-correction mode, the optical switch 403 shown in FIG. 5 is turned on, the optical switch 404 is turned off, and the output of the optical transmitter 501 is input to the optical receiver 600. The average current detection circuit 312 mounted on the optical receiver 600 is used to measure the average optical power value input to the light receiving element 311. Other operations are almost the same as those in the first embodiment. However, since the optical transmission unit 501 shown in FIG. 4 is not equipped with an APC circuit, it is necessary to correct the control signal a. The control signal a is corrected in the same manner as the control signal b.

具体的には、制御信号ａの値のまま光送受信器が正常な特性を提供できるスロープ効率ηlimit１と補正可能な限界のスロープ効率ηlife、制御信号aの値のまま光送受信器が正常な特性を提供できる閾値電流Ｉth１と補正可能な限界の閾値電流Ｉthlifeを求める。図３（ａ）において、記憶媒体４２０に記録されたスロープ効率の特性劣化曲線を現在のスロープ効率ηnow１に当てはめ、スロープ効率がηlimit１になる稼動積算時間Ｔηlimit１、スロープ効率がηlifeになる稼動積算時間Ｔηlifeを算出する。   Specifically, the slope efficiency ηlimit1 that can provide the normal characteristic with the value of the control signal a, the slope efficiency ηlife of the limit that can be corrected, the normal characteristic of the optical transceiver with the value of the control signal a. The threshold current Ith1 that can be provided and the limit threshold current Ithlife that can be corrected are obtained. In FIG. 3A, the characteristic degradation curve of the slope efficiency recorded in the storage medium 420 is applied to the current slope efficiency ηnow1, the operation integration time Tηlimit1 at which the slope efficiency becomes ηlimit1, and the operation integration time Tηlife at which the slope efficiency becomes ηlife. Is calculated.

図６（ａ）において、記憶媒体４２０に記録された閾値電流の特性劣化曲線を現在の閾値電流Ｉthnow１に当てはめ、閾値電流がＩthlimit１になる稼動積算時間ＴＩthlimit１、閾値電流がＩthlifeになる稼動積算時間ＴＩthlifeを算出する。またＴηlimit１とＴＩthlimit１、参考に次に自己補正モードをする稼動積算時間Ｔnext１を算出する。Ｔデータは記憶媒体４２０に記録されるとともに外部に出力し、通常モードに切替わる。制御信号ａ、制御信号ｂは自己補正モード時に補正された値となり、発光素子の経年による劣化が補正され、送信光信号は稼動前と同等の特性を示す。   In FIG. 6A, the threshold current characteristic deterioration curve recorded in the storage medium 420 is applied to the current threshold current Ithnow1, and the operation integration time TIthlimit1 at which the threshold current becomes Ithlimit1, and the operation integration time TIthlife at which the threshold current becomes Ithlife. Is calculated. Further, Tηlimit1 and TIthlimit1, and an operation integration time Tnext1 for the next self-correction mode are calculated for reference. The T data is recorded in the storage medium 420 and output to the outside, and the mode is switched to the normal mode. The control signal a and the control signal b are corrected values in the self-correction mode, the deterioration of the light emitting element due to aging is corrected, and the transmitted optical signal exhibits the same characteristics as before operation.

積算稼動時間がＴnext１になった際、再び、外部から入力されるモード切替信号によって、あるいは光送受信器内部で自己補正モードに切替わる。初回と同様な動作を繰り返すが、図３（ｂ）または図６（ｂ）に示すように発光素子の特性劣化曲線を測定したデータより補正し、曲線の精度を向上させる。同様な動作を２回、３回…Ｎ回と繰り返す。
本実施例に拠れば、長時間安定した送信特性を有する光送受信器を得ることができる。 When the integrated operation time reaches Tnext1, the mode is again switched to the self-correction mode by a mode switching signal input from the outside or inside the optical transceiver. The same operation as the first time is repeated, but the characteristic deterioration curve of the light emitting element is corrected from the measured data as shown in FIG. 3B or 6B to improve the accuracy of the curve. The same operation is repeated 2 times, 3 times, and N times.
According to this embodiment, it is possible to obtain an optical transceiver having transmission characteristics that are stable for a long time.

光送信器の構成を説明するブロック図である。It is a block diagram explaining the structure of an optical transmitter. スロープ効率、閾値電流の稼動時間依存性を説明する図である。It is a figure explaining the operating time dependence of slope efficiency and threshold current. 発光素子のスロープ効率の稼働限界推定を説明する図である。It is a figure explaining the operating limit estimation of the slope efficiency of a light emitting element. 光送受信器の構成を示すブロック図である。It is a block diagram which shows the structure of an optical transmitter / receiver. 光送信部の構成を示すブロック図である。It is a block diagram which shows the structure of an optical transmission part. 発光素子の閾値電流の稼働限界推定を説明する図である。It is a figure explaining the operating limit estimation of the threshold current of a light emitting element.

符号の説明Explanation of symbols

１０１…光送受信器、２１１…発光素子、２１２…変調駆動回路、２１３…変調駆動制御電流回路、２１４…モニタ光受光素子、２１５、２１７…平均光出力制御・駆動回路、２１６…発光素子温度モニタ回路、２１７…演算器、３００…光受信部、３１１…受光素子、３１２…平均電流検出回路、３１３…識別回路、４０１、４０２…光カプラ、４０３…スイッチ、４０４…スイッチ、４１７…演算器、４２０…記憶媒体、５００…光送信器、５０１…光送信部、６００…光受信部、７０１…光送受信器。
DESCRIPTION OF SYMBOLS 101 ... Optical transmitter / receiver, 211 ... Light emitting element, 212 ... Modulation drive circuit, 213 ... Modulation drive control current circuit, 214 ... Monitor light receiving element, 215, 217 ... Average light output control / drive circuit, 216 ... Light emitting element temperature monitor Circuits, 217 ... arithmetic units, 300 ... optical receivers, 311 ... light receiving elements, 312 ... average current detection circuits, 313 ... identification circuits, 401, 402 ... optical couplers, 403 ... switches, 404 ... switches, 417 ... arithmetic units, 420 ... Storage medium, 500 ... Optical transmitter, 501 ... Optical transmitter, 600 ... Optical receiver, 701 ... Optical transceiver.

Claims (5)

送信電気信号を変調信号に変換して発光素子を駆動する変調駆動部と、前記発光素子と、前記発光素子の出力をモニタして出力パワー一定制御する出力制御部とからなる光送信器において、
前記発光素子のスロープ効率を測定する制御部を有することを特徴とする光送信器。 In an optical transmitter including a modulation driving unit that converts a transmission electric signal into a modulation signal to drive a light emitting element, the light emitting element, and an output control unit that monitors the output of the light emitting element and controls output power constant.
An optical transmitter comprising a control unit for measuring a slope efficiency of the light emitting element. 請求項１に記載の光送信器であって、
前記制御部は、前記スロープ効率の経年劣化を検出したとき、その劣化量から前記発光素子の制御値を補正することを特徴とする光送信器。 The optical transmitter according to claim 1, wherein
The controller, when detecting the aging deterioration of the slope efficiency, corrects the control value of the light emitting element from the deterioration amount. 請求項２に記載の光送信器であって、
前記制御部は、スロープ効率の経年劣化特性を記録された記憶媒体を有することを特徴とする光送信器。 The optical transmitter according to claim 2, wherein
The said control part has a storage medium with which the aged deterioration characteristic of slope efficiency was recorded, The optical transmitter characterized by the above-mentioned. 送信電気信号を送信光信号に変換する光送信部と、受信光信号を受信電気信号に変換する光受信部で構成する光送受信器において、
前記光送信部の光出力の一部を、前記光受信部の光入力に戻す光路を有することを特徴とする光送受信器。 In an optical transmitter / receiver configured by an optical transmission unit that converts a transmission electrical signal into a transmission optical signal and an optical reception unit that converts a reception optical signal into a reception electrical signal,
An optical transceiver having an optical path for returning a part of the optical output of the optical transmitter to the optical input of the optical receiver. 請求項４に記載の光送受信器であって、
前記光送信部に搭載された発光素子の特性を監視し、その特性から前記発光素子の制御値を補正することを特徴とする光送受信器。
The optical transceiver according to claim 4,
An optical transceiver characterized by monitoring a characteristic of a light emitting element mounted on the optical transmission unit and correcting a control value of the light emitting element based on the characteristic.
JP2006015996A 2006-01-25 2006-01-25 Optical transmitter and optical transceiver Pending JP2007201043A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0818510A (en) * 1994-07-01 1996-01-19 Fujitsu Ltd Optical communication module
JP2006013252A (en) * 2004-06-28 2006-01-12 Hitachi Cable Ltd Method and circuit for controlling laser diode, and optical transmitter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0818510A (en) * 1994-07-01 1996-01-19 Fujitsu Ltd Optical communication module
JP2006013252A (en) * 2004-06-28 2006-01-12 Hitachi Cable Ltd Method and circuit for controlling laser diode, and optical transmitter

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