JP2015115411A - High-speed wavelength sweep light source - Google Patents

High-speed wavelength sweep light source Download PDF

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JP2015115411A
JP2015115411A JP2013255350A JP2013255350A JP2015115411A JP 2015115411 A JP2015115411 A JP 2015115411A JP 2013255350 A JP2013255350 A JP 2013255350A JP 2013255350 A JP2013255350 A JP 2013255350A JP 2015115411 A JP2015115411 A JP 2015115411A
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wavelength
light source
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laser
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拓也 金井
Takuya Kanai
拓也 金井
伸浩 布谷
Nobuhiro Nunotani
伸浩 布谷
石井　啓之
Hiroyuki Ishii
啓之 石井
真 下小園
Makoto Shimokozono
真 下小園
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Nippon Telegraph and Telephone Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a high-speed wavelength sweep light source capable of changing a wavelength continuously over a wide band by using a plurality of wavelength variable laser arrays each capable of performing current control on an oscillation wavelength for light sources.SOLUTION: A high-speed wavelength sweep light source 100 includes N pieces of wavelength variable lasers 102-1 to 102-N, a controller 101 for controlling the lasers, and a multiplexer 103 which multiplexes light outputted from the wavelength variable lasers and outputs multiplexed light to an optical fiber 104. Each of the wavelength variable lasers 102-1 to 102-N is a wavelength variable laser of a type including an active region and an inactive region and changing the oscillation wavelength by changing an injection current to the inactive layer region. For the wavelength variable lasers 102-1 to 102-N, the oscillation wavelength is controlled by the controller 101 and when performing switching between the wavelength variable lasers, output of the neighboring wavelength variable lasers is multiplexed by the multiplexer 103, such that the wavelength of output is controlled to be changed continuously.

Description

本発明は、高速且つ大きな波長可変域を有する波長可変レーザを用いた高速波長掃引光源に関する。   The present invention relates to a high-speed wavelength swept light source using a wavelength tunable laser having a high speed and a large wavelength tunable range.

近年、光通信、分光分析や光イメージングなど、様々な分野で波長を変化させることができる光源を用いたシステムや測定技術が多く開発されている。特に、高度な光通信システムや、高精度な測定器を実現するには、単一の波長で発振する高品質な単一モードレーザが必要不可欠である。また、測定技術の高度化には高速に波長を掃引できることも必要な技術である。   In recent years, many systems and measurement techniques using a light source capable of changing the wavelength in various fields such as optical communication, spectroscopic analysis, and optical imaging have been developed. In particular, a high-quality single-mode laser that oscillates at a single wavelength is indispensable for realizing an advanced optical communication system and a highly accurate measuring instrument. Moreover, it is necessary to sweep the wavelength at high speed in order to advance the measurement technique.

単一モードレーザ発振を実現する方法としては、光導波路に周期的な凹凸の構造をした回折格子を用いるものがある。回折格子が形成された光導波路においては、光導波路の等価屈折率をｎ、回折格子の周期をΛとすると、その反射波長λＢは以下の（１）式で表される。
λＢ＝２ｎΛ （１） As a method for realizing single mode laser oscillation, there is a method using a diffraction grating having a periodic uneven structure in an optical waveguide. In an optical waveguide in which a diffraction grating is formed, the reflection wavelength λ B is expressed by the following equation (1), where n is the equivalent refractive index of the optical waveguide and Λ is the period of the diffraction grating.
λ B = 2nΛ (1)

上記（１）式より、光導波路の等価屈折率を変化させることで反射波長を変化させるこ
とができることがわかる。つまり、回折格子を用いた光共振器を構成することで、選択的に波長を変化させられる波長可変レーザを構成することができる。 From the above equation (1), it can be seen that the reflection wavelength can be changed by changing the equivalent refractive index of the optical waveguide. That is, by configuring an optical resonator using a diffraction grating, it is possible to configure a wavelength tunable laser that can selectively change the wavelength.

回折格子を利用した波長可変レーザとしては、ＤＢＲ（Ｄｉｓｔｒｉｂｕｔｅｄ Ｂｒａｇｇ Ｒｅｆｌｅｃｔｏｒ）レーザ、ＳＧ（Ｓａｍｐｌｅｄ Ｇｒａｔｉｎｇ）−ＤＢＲレーザやＳＳＧ（Ｓｕｐｅｒ Ｓｔｒｕｃｔｕｒｅ Ｇｒａｔｉｎｇ）−ＤＢＲレーザなどがある。また、これらのレーザにおいて、ＤＢＲ部分への注入電流を制御することでキャリアプラズマ効果により導波路内の等価屈折率変化が生じ、高速に波長を変化させることができる。その他の高速に波長を掃引する技術としては、機械的に外部鏡（例えば、反射型回折格子など）を制御することで波長を変化させる技術などがある。   Examples of the wavelength tunable laser using the diffraction grating include a DBR (Distributed Bragg Reflector) laser, an SG (Sampled Grafting) -DBR laser, and an SSG (Super Structure Grafting) -DBR laser. In these lasers, by controlling the injection current into the DBR portion, the equivalent refractive index change in the waveguide is caused by the carrier plasma effect, and the wavelength can be changed at high speed. As another technique for sweeping the wavelength at high speed, there is a technique for changing the wavelength by mechanically controlling an external mirror (for example, a reflective diffraction grating).

特開２００８−１０３４６６号公報JP 2008-103466 A 特開２００８−２１８９４７号公報JP 2008-218947 A

しかしながら、ＳＧ−ＤＢＲやＳＳＧ−ＤＢＲは、多数の反射ピークを持つ反射器を使い、モードホップを利用して広帯域な波長可変幅を実現しているため、反射ピーク波長だけでなく位相も合わせた制御が必要となり、制御系が非常に複雑になってしまうという課題がある。また、外部鏡を用いた波長掃引光源に関しては、機械的に制御するため、その駆動部の速度に波長掃引速度が律速される課題がある。   However, SG-DBR and SSG-DBR use a reflector having a large number of reflection peaks, and realize a wide wavelength tunable width using mode hops. Therefore, not only the reflection peak wavelength but also the phase is matched. There is a problem that control is required and the control system becomes very complicated. Further, since the wavelength sweep light source using the external mirror is mechanically controlled, there is a problem that the wavelength sweep speed is limited by the speed of the drive unit.

本発明は、このような課題を鑑みてなされたもので、その目的とするところは、光源に発振波長を電流制御可能な複数の波長可変レーザアレイを用いることで、広帯域で連続的に波長を変化させることができる高速波長掃引光源を提供することにある。   The present invention has been made in view of such problems. The object of the present invention is to use a plurality of wavelength tunable laser arrays capable of current control of the oscillation wavelength as a light source, so that the wavelength can be continuously increased over a wide band. The object is to provide a fast wavelength swept light source that can be varied.

上記の課題を解決するために、本発明は、高速波長掃引光源であって、発振波長が電流制御可能で、モードホップなく連続的に波長を変化させることができる、異なる可変波長域を有する複数の波長可変レーザと、前記複数の波長可変レーザの出力強度と発振波長を制御する制御器と、前記複数の波長可変レーザが接続された光合波器と、を有することを特徴とする。   In order to solve the above problems, the present invention is a high-speed wavelength swept light source, the oscillation wavelength is current-controllable, and the wavelength can be changed continuously without mode hops, and have a plurality of different variable wavelength regions And a controller for controlling output intensity and oscillation wavelength of the plurality of wavelength tunable lasers, and an optical multiplexer to which the plurality of wavelength tunable lasers are connected.

請求項２に記載の発明は、請求項１に記載の高速波長掃引光源において、前記制御器は、前記各波長可変レーザの注入電流に対する発振波長の関係を表す波長可変特性に合わせて波長制御信号の波形を制御することにより、前記各波長可変レーザの発信波長を時間に対して線形に変化させることを特徴とする。   According to a second aspect of the present invention, in the high-speed wavelength swept light source according to the first aspect, the controller controls the wavelength control signal in accordance with a wavelength variable characteristic that represents a relationship of an oscillation wavelength with respect to an injection current of each wavelength variable laser. By controlling the waveform, the transmission wavelength of each wavelength tunable laser is changed linearly with respect to time.

請求項３に記載の発明は、請求項１又は２に記載の高速波長掃引光源において、隣接する前記波長可変レーザ間の前記可変波長域は、一部重なりを有することを特徴とする。   According to a third aspect of the present invention, in the high-speed wavelength swept light source according to the first or second aspect, the variable wavelength region between the adjacent wavelength tunable lasers partially overlaps.

請求項４に記載の発明は、請求項１乃至３に記載の高速波長掃引光源において、前記波長可変レーザは、半導体波長可変レーザであることを特徴とする。   According to a fourth aspect of the present invention, in the high-speed wavelength swept light source according to the first to third aspects, the tunable laser is a semiconductor tunable laser.

請求項５に記載の発明は、請求項１乃至３に記載の高速波長掃引光源において、前記波長可変レーザは、ＴＤＡ−ＤＦＢレーザであることを特徴とする。   According to a fifth aspect of the present invention, in the high-speed wavelength swept light source according to the first to third aspects, the wavelength tunable laser is a TDA-DFB laser.

本発明によれば、光源に発振波長を電流制御可能な複数の波長可変レーザアレイを用いることで、簡易な制御系を用いて広帯域で連続的に高速波長掃引できる高速波長掃引光源を実現することができる。   According to the present invention, by using a plurality of wavelength tunable laser arrays capable of controlling the oscillation wavelength as a light source, a high-speed wavelength swept light source capable of continuous high-speed wavelength sweeping in a wide band using a simple control system is realized. Can do.

本発明の実施形態１に係る波長可変レーザを有する高速波長掃引光源の構造を示す図である。It is a figure which shows the structure of the high-speed wavelength sweep light source which has a wavelength tunable laser which concerns on Embodiment 1 of this invention. 本発明の高速波長掃引光源の出力光の波長の時間変化を示す図である。It is a figure which shows the time change of the wavelength of the output light of the high-speed wavelength sweep light source of this invention. 本発明の実施形態２に係る波長可変分布活性（ＴＤＡ）−ＤＦＢレーザアレイを有する高速波長掃引光源を示す図である。It is a figure which shows the high-speed wavelength swept light source which has a wavelength tunable distributed activity (TDA) -DFB laser array which concerns on Embodiment 2 of this invention. ＴＤＡ−ＤＦＢレーザの基本的な構造を示す図である。It is a figure which shows the basic structure of a TDA-DFB laser. ＴＤＡ−ＤＦＢレーザアレイの制御電圧に対する発振波長の特性例を示す図である。It is a figure which shows the example of a characteristic of the oscillation wavelength with respect to the control voltage of a TDA-DFB laser array.

以下、本発明の実施の形態について、詳細に説明する。尚、以下に説明する実施形態は本発明の実施例であり、本発明は、以下の実施形態に制限されるものではない。   Hereinafter, embodiments of the present invention will be described in detail. The embodiments described below are examples of the present invention, and the present invention is not limited to the following embodiments.

（実施形態１）
図１に、本発明の実施形態１に係る波長可変レーザを有する高速波長掃引光源の構造を示す。高速波長掃引光源１００は、Ｎ個の波長可変レーザ１０２−１〜１０２−Ｎと、それらを制御するための制御器１０１と、各波長可変レーザから出力された光を合波し、光ファイバ１０４に出力する合波器１０３（例えば、パワースプリッタ（ＰＳ）やＡｒｒａｙｅｄ ｗａｖｅｇｕｉｄｅ ｇｒａｔｉｎｇ （ＡＷＧ）など）を備える。 (Embodiment 1)
FIG. 1 shows the structure of a high-speed wavelength swept light source having a wavelength tunable laser according to Embodiment 1 of the present invention. The high-speed wavelength swept light source 100 combines N wavelength tunable lasers 102-1 to 102-N, a controller 101 for controlling them, and light output from each wavelength tunable laser, and an optical fiber 104. Is provided with a multiplexer 103 (for example, a power splitter (PS) or an arrayed waveguide grating (AWG)).

波長可変レーザ１０２−１〜１０２−Ｎは、活性領域及び非活性領域を有していて、その非活性層領域への注入電流を変化させることで発振波長を変化させるタイプの波長可変レーザである。波長可変レーザ１０２−１〜１０２−Ｎは、それぞれが隣接する波長可変レーザ間で一部重なりを有しながら異なる可変波長域を有している。波長可変レーザ１０２−１〜１０２−Ｎは、制御器１０１によってその発振波長が制御され、波長可変レーザ間の切り替えを行う際には隣接する波長可変レーザの出力を合波器１０３で合波することにより、出力の波長が連続的に変化するように制御される。   The wavelength tunable lasers 102-1 to 102-N are wavelength tunable lasers having an active region and an inactive region, and changing an oscillation wavelength by changing an injection current into the inactive layer region. . Each of the wavelength tunable lasers 102-1 to 102-N has a different variable wavelength region while partially overlapping between adjacent wavelength tunable lasers. The oscillation wavelengths of the wavelength tunable lasers 102-1 to 102-N are controlled by the controller 101. When switching between the wavelength tunable lasers, the output of the adjacent wavelength tunable lasers is multiplexed by the multiplexer 103. Thus, the output wavelength is controlled to change continuously.

図２に、本発明の高速波長掃引光源の出力光の波長の時間変化を示す。制御器１０１は、各波長可変レーザ１０２−１〜１０２−Ｎにおける非活性領域への注入電流又は制御電圧と発振波長との関係を表す波長可変特性を予め有しており、その波長可変特性に合わせて発振波長を制御する。これにより、高速波長掃引光源１００の出力光の波長を時間に対して線形に変化するように制御することができる。また、波長可変レーザ１０２−１〜１０２−Ｎの各可変波長域の一部が僅かに重なるように隣接しているので、高速波長掃引光源１００の出力光の波長を途切れることなく連続的に変化させることができる。   FIG. 2 shows the time change of the wavelength of the output light of the high-speed wavelength swept light source of the present invention. The controller 101 has in advance a wavelength variable characteristic that represents the relationship between the injection current or control voltage to the inactive region and the oscillation wavelength in each of the wavelength variable lasers 102-1 to 102-N. In addition, the oscillation wavelength is controlled. Thereby, it is possible to control the wavelength of the output light of the high-speed wavelength swept light source 100 so as to change linearly with respect to time. In addition, since the wavelength tunable lasers 102-1 to 102-N are adjacent to each other so that some of the variable wavelength regions are slightly overlapped, the wavelength of the output light of the high-speed wavelength swept light source 100 is continuously changed without interruption. Can be made.

また、波長可変レーザ１０２−１〜１０２−Ｎは、その出力を増幅もしくは一定にするために光増幅器（例えば、半導体増幅器（ＳＯＡ）など）をそれぞれ有することができる。波長可変レーザ１０２−１〜１０２−Ｎが光増幅器を有する場合、各光増幅器は制御器１０１によって制御され、波長可変レーザ１０２−１〜１０２−Ｎの各出力強度を制御するシャッターの役割も担うことができる。   Further, each of the wavelength tunable lasers 102-1 to 102-N can have an optical amplifier (for example, a semiconductor amplifier (SOA)) in order to amplify or make the output constant. When the wavelength tunable lasers 102-1 to 102-N have optical amplifiers, each optical amplifier is controlled by the controller 101, and also serves as a shutter for controlling the output intensities of the wavelength tunable lasers 102-1 to 102-N. be able to.

（実施形態２）
図３に、本発明の実施形態２に係る波長可変分布活性（ＴＤＡ）−ＤＦＢレーザアレイを有する高速波長掃引光源を示す。高速波長掃引光源３００は、Ｎ個のＴＤＡ−ＤＦＢレーザ３０２−１〜３０２−Ｎと、それらを制御する制御器３０１と、ＴＤＡ−ＤＦＢレーザ３０２−１〜３０２−Ｎから出力された光を合波し、光ファイバ３０４に出力する合波器３０３（例えば、ＰＳやＡＷＧなど）を備える。 (Embodiment 2)
FIG. 3 shows a fast wavelength swept light source having a wavelength tunable distributed activity (TDA) -DFB laser array according to Embodiment 2 of the present invention. The high-speed wavelength swept light source 300 combines N TDA-DFB lasers 302-1 to 302-N, a controller 301 for controlling them, and light output from the TDA-DFB lasers 302-1 to 302-N. A multiplexer 303 (for example, PS, AWG, etc.) is provided.

ＴＤＡ−ＤＦＢレーザは、連続的に波長を変化させることのできる波長可変半導体レーザである。図４に、ＴＤＡ−ＤＦＢレーザの基本的な構造を示す。ＴＤＡ−ＤＦＢレーザ４００は、基板４０１上に活性導波路層４０２と非活性導波路層４０３（波長制御領域）がそれぞれ一定の長さＬａ、Ｌｔで交互に周期的に形成された構造になっている（例えば、特許文献１参照）。活性導波路層４０２と非活性導波路層４０３の上部には、中央付近に位相シフト領域４０４が形成された回折格子４０５が形成されており、回折格子４０５の周期に応じた波長のみ選択的に反射されるようになっている。また、基板４０１の表面には１つの電極４０６が形成され、回折格子４０１の表面には活性導波路層４０２上に形成された電極４０７と非活性導波路層４０３上に形成された電極４０８とからなる２つの電極が形成されている。   The TDA-DFB laser is a wavelength tunable semiconductor laser capable of continuously changing the wavelength. FIG. 4 shows the basic structure of a TDA-DFB laser. The TDA-DFB laser 400 has a structure in which an active waveguide layer 402 and an inactive waveguide layer 403 (wavelength control region) are alternately and periodically formed with constant lengths La and Lt on a substrate 401, respectively. (For example, refer to Patent Document 1). A diffraction grating 405 in which a phase shift region 404 is formed in the vicinity of the center is formed above the active waveguide layer 402 and the inactive waveguide layer 403, and only the wavelength corresponding to the period of the diffraction grating 405 is selectively used. Reflected. Further, one electrode 406 is formed on the surface of the substrate 401, and an electrode 407 formed on the active waveguide layer 402 and an electrode 408 formed on the inactive waveguide layer 403 are formed on the surface of the diffraction grating 401. Two electrodes made of are formed.

このＴＤＡ−ＤＦＢレーザ４００においては、活性導波路層４０２へ電流Ｉａを注入することで利得が生じ、回折格子４０５で選択的に反射された波長においてレーザ発振が起こる。一方、非活性導波路層４０３に電流Ｉｔを注入すると、キャリアプラズマ効果により導波路内の屈折率変化が生じ、非活性導波路４０３における回折格子４０５の反射波長が変化する。そのため、非活性導波路層４０３に注入する電流量を変化させることで、ＴＤＡ−ＤＦＢレーザの発振波長を変化させることができる（特許文献１、２参照）。また、ＴＤＡ−ＤＦＢレーザはその構造上、波長変化時に原理的にモードホップが生じず、連続的に波長を変化させられるという特徴がある。 In this TDA-DFB laser 400, a gain is caused by injecting the current I a to the active waveguide layer 402, the laser oscillation occurs in the selectively reflected wavelength by the diffraction grating 405. On the other hand, when a current is injected I t in an inactive waveguide layer 403, the refractive index change in the waveguide is generated by the carrier plasma effect, reflection wavelength of the diffraction grating 405 in the non-active waveguide 403 is changed. Therefore, the oscillation wavelength of the TDA-DFB laser can be changed by changing the amount of current injected into the inactive waveguide layer 403 (see Patent Documents 1 and 2). In addition, the TDA-DFB laser has a feature that, in principle, mode hops do not occur when the wavelength changes, and the wavelength can be changed continuously.

ＴＤＡ−ＤＦＢレーザ４００の波長可変幅は最大で８ｎｍ程度である。そのＴＤＡ−ＤＦＢレーザを同一の半導体上に二次元的に配列したＴＤＡ−ＤＦＢレーザアレイとすることで４０ｎｍ以上の広帯域な波長可変幅を実現することができる。   The wavelength variable width of the TDA-DFB laser 400 is about 8 nm at the maximum. By using the TDA-DFB laser array in which the TDA-DFB laser is two-dimensionally arranged on the same semiconductor, a wide wavelength tunable width of 40 nm or more can be realized.

ＴＤＡ−ＤＦＢレーザ３０２−１〜３０２−Ｎは、それぞれが隣接する波長可変レーザ間で一部重なりを有しながら異なる可変波長域を有している。ＴＤＡ−ＤＦＢレーザ３０２−１〜３０２−Ｎは、制御器３０１によってその発振波長が制御され、波長可変レーザ間の切り替えを行う際には隣接する波長可変レーザの出力を合波器３０３で合波することにより、出力の波長が連続的に変化するように制御される。   Each of the TDA-DFB lasers 302-1 to 302-N has different variable wavelength regions while partially overlapping each other between adjacent wavelength variable lasers. The oscillation wavelengths of the TDA-DFB lasers 302-1 to 302-N are controlled by the controller 301. When switching between the wavelength tunable lasers, the output of adjacent wavelength tunable lasers is multiplexed by the multiplexer 303. By doing so, the output wavelength is controlled to change continuously.

図５に、ＴＤＡ−ＤＦＢレーザアレイの制御電圧に対する発振波長の特性例を示す。制御器３０１は、各ＴＤＡ−ＤＦＢレーザ３０２−１〜３０２−Ｎにおける非活性領域への注入電流又は制御電圧と発振波長との関係を表す波長可変特性を予め有しており、その波長可変特性に合わせて発振波長を制御する。制御器３０１は、この波長特性に合わせて制御信号の波形を制御することで、高速波長掃引光源３００の出力光の波長を時間に対して線形に変化するように制御することができる。   FIG. 5 shows a characteristic example of the oscillation wavelength with respect to the control voltage of the TDA-DFB laser array. The controller 301 has in advance a wavelength tunable characteristic indicating the relationship between the injection current or control voltage to the inactive region and the oscillation wavelength in each TDA-DFB laser 302-1 to 302-N, and the wavelength tunable characteristic. The oscillation wavelength is controlled according to. The controller 301 can control the wavelength of the output light of the high-speed wavelength swept light source 300 to change linearly with respect to time by controlling the waveform of the control signal in accordance with this wavelength characteristic.

また、ＴＤＡ−ＤＦＢレーザ３０２−１〜３０２−Ｎの各可変波長域の一部が僅かに重なるように隣接しているので、高速波長掃引光源３００の出力光の波長を途切れることなく連続的に変化させることができる。   In addition, since the TDA-DFB lasers 302-1 to 302-N are adjacent to each other so that a part of each of the variable wavelength regions is slightly overlapped, the wavelength of the output light of the high-speed wavelength swept light source 300 is continuously interrupted. Can be changed.

以上のように、Ｎ個の波長可変レーザもしくはＴＤＡ−ＤＦＢレーザからなるレーザアレイを組み合わせることで、シンプルな構成で広帯域且つ連続的に波長を掃引できる高速波長掃引光源を実現することができる。   As described above, by combining a laser array composed of N wavelength variable lasers or TDA-DFB lasers, it is possible to realize a high-speed wavelength swept light source that can sweep a wavelength continuously with a simple configuration.

１００、３００ 高速波長掃引光源
１０１、３０１ 制御器
１０２−１〜１０２−Ｎ 波長可変レーザ
１０３、３０３ 合波器
１０４、３０４ 光ファイバ
３０２−１〜３０２−Ｎ ＴＤＡ−ＤＦＢレーザ
４００ ＴＤＡ−ＤＦＢレーザ
４０１ 基板
４０２ 活性導波路層
４０３ 非活性導波路層
４０４ 位相シフト領域
４０５ 回折格子
４０６〜４０８ 電極 100, 300 High-speed wavelength swept light source 101, 301 Controller 102-1 to 102-N Tunable laser 103, 303 Multiplexer 104, 304 Optical fiber 302-1 to 302-N TDA-DFB laser 400 TDA-DFB laser 401 Substrate 402 Active waveguide layer 403 Inactive waveguide layer 404 Phase shift region 405 Diffraction grating 406 to 408 Electrode

Claims (5)

発振波長が電流制御可能で、モードホップなく連続的に波長を変化させることができる、異なる可変波長域を有する複数の波長可変レーザと、
前記複数の波長可変レーザの出力強度と発振波長を制御する制御器と、
前記複数の波長可変レーザが接続された光合波器と、
を有することを特徴とする高速波長掃引光源。 A plurality of wavelength tunable lasers having different variable wavelength ranges in which the oscillation wavelength is current-controllable and the wavelength can be continuously changed without mode hops,
A controller for controlling the output intensity and oscillation wavelength of the plurality of wavelength tunable lasers;
An optical multiplexer to which the plurality of wavelength tunable lasers are connected;
A high-speed wavelength swept light source characterized by comprising: 前記制御器は、前記各波長可変レーザの注入電流に対する発振波長の関係を表す波長可変特性に合わせて波長制御信号の波形を制御することにより、前記各波長可変レーザの発信波長を時間に対して線形に変化させることを特徴とする請求項１に記載の高速波長掃引光源。   The controller controls the waveform of the wavelength control signal according to the wavelength tunable characteristic indicating the relationship of the oscillation wavelength to the injection current of each wavelength tunable laser, thereby changing the transmission wavelength of each wavelength tunable laser with respect to time. 2. The fast wavelength swept light source according to claim 1, wherein the light source is linearly changed. 隣接する前記波長可変レーザ間の前記可変波長域は、一部重なりを有することを特徴とする請求項１又は２に記載の高速波長掃引光源。   3. The high-speed wavelength swept light source according to claim 1, wherein the variable wavelength region between the adjacent wavelength tunable lasers partially overlaps. 前記波長可変レーザは、半導体波長可変レーザであることを特徴とする請求項１乃至３に記載の高速波長掃引光源。   4. The fast wavelength swept light source according to claim 1, wherein the wavelength tunable laser is a semiconductor wavelength tunable laser. 前記波長可変レーザは、ＴＤＡ−ＤＦＢレーザであることを特徴とする請求項１乃至３に記載の高速波長掃引光源。   4. The high-speed wavelength swept light source according to claim 1, wherein the wavelength tunable laser is a TDA-DFB laser.
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