JPH08233662A - Light pulse waveform measuring instrument - Google Patents
Light pulse waveform measuring instrumentInfo
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- JPH08233662A JPH08233662A JP6501195A JP6501195A JPH08233662A JP H08233662 A JPH08233662 A JP H08233662A JP 6501195 A JP6501195 A JP 6501195A JP 6501195 A JP6501195 A JP 6501195A JP H08233662 A JPH08233662 A JP H08233662A
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- light
- signal
- gate
- frequency
- light source
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、主に光ソリトン通信
に使用される短パルス光源の短パルス光を広範囲な波長
で測定する光パルス波形測定器についてのものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pulse waveform measuring instrument for measuring short pulse light of a short pulse light source mainly used for optical soliton communication in a wide range of wavelengths.
【０００２】[0002]
【従来の技術】次に、従来技術による光パルス波形測定
器の構成を図２に示す。図２の１・２は信号発生器、３
・４は駆動回路、６は信号光源、７はゲート光源、９は
グラン・テイラー偏光プリズム（以下ＧＴプリズムとい
う）、１０は偏光ビームスプリッタ（以下ＰＢＳとい
う）、１１はビームスプリッタ（以下ＢＳという）、１
４は非線形結晶、２０は受光器、２１はアンプ、２２は
表示部、２３はミキサ、２４は光ＢＰＦである。表示部
２２は例えばオシロスコープを使用する。2. Description of the Related Art Next, FIG. 2 shows the configuration of a conventional optical pulse waveform measuring device. 2, 1 and 2 are signal generators and 3
4 is a drive circuit, 6 is a signal light source, 7 is a gate light source, 9 is a Gran-Taylor polarizing prism (hereinafter referred to as GT prism), 10 is a polarizing beam splitter (hereinafter referred to as PBS), 11 is a beam splitter (hereinafter referred to as BS) 1
Reference numeral 4 is a nonlinear crystal, 20 is a light receiver, 21 is an amplifier, 22 is a display unit, 23 is a mixer, and 24 is an optical BPF. The display unit 22 uses, for example, an oscilloscope.
【０００３】図２で、信号発生器１は繰り返し周波数ｆ
0 の電気信号を発生する。信号発生器１からの電気信号
は駆動回路３により増幅された後、信号光源６を駆動す
る。なお信号光源６は駆動回路３を含む構成のものを使
用してもよい。一方、信号発生器２は信号発生器１と同
期した繰り返し周波数ｆ0 −Δｆの電気信号を発生す
る。信号発生器２からの電気信号は駆動回路４により増
幅された後、ゲート光源７を駆動する。なお信号光源６
と同様、ゲート光源７は駆動回路４を含む構成のものを
使用してもよい。In FIG. 2, the signal generator 1 has a repetition frequency f.
Generates a zero electrical signal. The electric signal from the signal generator 1 is amplified by the drive circuit 3 and then drives the signal light source 6. Note that the signal light source 6 may be configured to include the drive circuit 3. On the other hand, the signal generator 2 generates an electric signal having a repetition frequency f 0 −Δf in synchronization with the signal generator 1. The electric signal from the signal generator 2 is amplified by the drive circuit 4 and then drives the gate light source 7. The signal light source 6
Similarly to the above, the gate light source 7 may be configured to include the drive circuit 4.
【０００４】信号光源６は任意の角周波数ωs で発振す
る信号光６ａを出射し、信号光６ａはＧＴプリズム９に
より直線偏光となる。ＧＴプリズムは空間を保たせて向
かい合わせた２つの直角プリズムで構成され、特定の波
長範囲の入射光は第１のプリズムを透過すると第２のプ
リズムにブリュースター角で入射され、第２のプリズム
の入射面における反射損失がほとんど生じないように設
計されたものである。また、ゲート光源７は一定の角周
波数ωg で発振する短パルス状のゲート光７ａを出射
し、ゲート光７ａはＰＢＳ１０により信号光６ａと同一
偏光方向の直線偏光となる。信号光６ａとゲート光７ａ
はＢＳ１１に入射し、同一光軸上に合波された後、非線
形結晶１４に入射する。The signal light source 6 emits a signal light 6a oscillating at an arbitrary angular frequency ω s , and the signal light 6a is linearly polarized by the GT prism 9. The GT prism is composed of two right-angled prisms that face each other while maintaining a space. When the incident light of a specific wavelength range passes through the first prism, it is incident on the second prism at Brewster's angle, and the second prism It is designed so that the reflection loss on the incident surface of is hardly caused. The gate light source 7 emits a short pulsed gate light 7a that oscillates at a constant angular frequency ω g , and the gate light 7a is linearly polarized in the same polarization direction as the signal light 6a by the PBS 10. Signal light 6a and gate light 7a
Enters the BS 11, is multiplexed on the same optical axis, and then enters the nonlinear crystal 14.
【０００５】非線形結晶１４は信号光６ａとゲート光７
ａの両光の角周波数ωs とωg を加算した角周波数ω＝
ωs ＋ωg の和周波光１４ａと、信号光６ａとゲート光
７ａの両光の角周波数ωs 、ωg の２倍の角周波数２ω
s 、２ωg に相当する２種類の第２高調波１４ｂ・１４
ｃを出射する。非線形結晶１４は例えば無機系のＫＴＰ
結晶や有機系のＮＰＰ結晶等を使用する。光ＢＰＦ２４
は非線形結晶１４を出射した信号光６ａ・ゲート光７ａ
と両光の第２高調波１４ｂ・１４ｃを除去し、和周波光
１４ａのみを透過する。受光器２０は光ＢＰＦ２４を透
過した和周波光１４ａの光強度に比例した電気信号を出
力し、アンプ２１は出力された電気信号を増幅する。The nonlinear crystal 14 has a signal light 6a and a gate light 7
Angular frequency ω = sum of angular frequencies ω s and ω g of both lights of a
The sum frequency light 14a of ω s + ω g and the angular frequencies ω s and ω g twice the angular frequencies ω s and ω g of both the signal light 6a and the gate light 7a.
s, the second harmonic 14b · 14 two corresponding to 2 [omega g
Emit c. The nonlinear crystal 14 is, for example, an inorganic KTP.
Crystals or organic NPP crystals are used. Optical BPF24
Is the signal light 6a and the gate light 7a emitted from the nonlinear crystal 14.
The second harmonics 14b and 14c of both lights are removed, and only the sum frequency light 14a is transmitted. The light receiver 20 outputs an electric signal proportional to the light intensity of the sum frequency light 14a transmitted through the light BPF 24, and the amplifier 21 amplifies the outputted electric signal.
【０００６】ここで、信号光６ａとゲート光７ａは信号
発生器１・２の繰り返し周波数ｆ0・ｆ0 −Δｆに依存
するので、両光の繰り返し周波数はΔｆずれることにな
る。したがって信号光６ａとゲート光７ａは時間に対す
る相対位置が、図３に示すように毎回Δｔ（＝Δｆ／ｆ
0 2）だけずれ、Δｆの周期が経過すると再び両光の相対
位置が一致する。さらに非線形結晶１４から出射する和
周波光１４ａの光強度は、信号光６ａとゲート光７ａの
光強度の積に比例するので、両光の繰り返し周波数をΔ
ｆずらして掃引すると信号光６ａはゲート光７ａでサン
プリングされ、その時の光パルス波形は図４のように表
される。そして図４の光パルス波形の包絡線は、信号光
６ａの光パルス波形の時間軸をｆ0 ／Δｆ倍に拡大した
ものと一致する。Here, since the signal light 6a and the gate light 7a depend on the repetition frequency f 0 · f 0 −Δf of the signal generators 1 and 2, the repetition frequencies of both lights are deviated by Δf. Therefore, the relative positions of the signal light 6a and the gate light 7a with respect to time are Δt (= Δf / f) each time as shown in FIG.
0 2) shifted, relative position of both again the cycle of Δf elapses light matches. Furthermore, since the light intensity of the sum frequency light 14a emitted from the nonlinear crystal 14 is proportional to the product of the light intensity of the signal light 6a and the light intensity of the gate light 7a, the repetition frequency of both lights is Δ.
The signal light 6a is sampled by the gate light 7a when swept by shifting f, and the optical pulse waveform at that time is represented as shown in FIG. Then, the envelope of the optical pulse waveform of FIG. 4 coincides with the time axis of the optical pulse waveform of the signal light 6a enlarged by f 0 / Δf times.
【０００７】したがって、信号発生器１・２からの電気
信号をミキサ２３に入力し、ミキサ２３より繰り返し周
波数Δｆのトリガ信号を表示部２２にトリガ入力として
与え、アンプ２１からの増幅電気信号を波形再生するこ
とにより、信号光６ａの光パルス波形の時間軸はｆ0 ／
Δｆ倍に拡大され、受光器２０の帯域に制限されること
なく高速な信号光６ａの光パルス波形を観測する。Therefore, the electric signals from the signal generators 1 and 2 are input to the mixer 23, the trigger signal of the repeating frequency Δf is given from the mixer 23 to the display unit 22 as the trigger input, and the amplified electric signal from the amplifier 21 is waveformd. By reproducing, the time axis of the optical pulse waveform of the signal light 6a is f 0 /
The optical pulse waveform of the high-speed signal light 6a, which is expanded by Δf times and is not limited to the band of the light receiver 20, is observed.
【０００８】[0008]
【発明が解決しようとする課題】非線形結晶１４から出
射する和周波光の角周波数ωは信号光の角周波数ωs と
ゲート光の角周波数ωg の和周波数となるので、信号光
の角周波数ωs が変化する場合には、光ＢＰＦ２４の中
心波長を信号光の角周波数ωs に対応した和周波光の角
周波数ωと一致するように可変させる必要がある。Since the INVENTION Problems to be Solved] sum frequency of the angular frequency omega g of the nonlinear crystal 14 the angular frequency of the sum frequency light emitted from omega signal light having an angular frequency omega s and the gate light, the angular frequency of the signal light When ω s changes, it is necessary to change the center wavelength of the optical BPF 24 so as to match the angular frequency ω of the sum frequency light corresponding to the angular frequency ω s of the signal light.
【０００９】さらに、非線形結晶１４から出射する和周
波光ωの光強度は、図５に示す非線形結晶の結晶軸（X,
Y,Z ）が信号光とゲート光の光軸に対して最適位相整合
角度（θopt,φopt ）を満足している場合に最大となる
が、信号光の角周波数ωs が変化すると、非線形結晶の
結晶軸（X,Y,Z ）に対する最適位相整合角度（θopt,φ
opt ）も変化してしまうため、信号光の波長λs が変わ
り角周波数ωs が変化する場合には、非線形結晶の結晶
軸（X,Y,Z ）を信号光とゲート光の光軸に対して常に最
適となるように角度制御する必要がある。Further, the light intensity of the sum frequency light ω emitted from the nonlinear crystal 14 is determined by the crystal axis (X,
Y, Z) is the maximum when the optimum phase matching angles (θ opt , φ opt ) with respect to the optical axes of the signal light and the gate light are satisfied, but when the angular frequency ω s of the signal light changes, Optimal phase matching angle (θ opt , φ for the crystal axis (X, Y, Z) of the nonlinear crystal
opt ) also changes, so when the wavelength λ s of the signal light changes and the angular frequency ω s changes, the crystal axes (X, Y, Z) of the nonlinear crystal become the optical axes of the signal light and the gate light. On the other hand, it is necessary to control the angle so that it is always optimum.
【００１０】しかし、図２の構成では、信号光の波長λ
s が変わり角周波数ωs が変化しても、光ＢＰＦ２４の
中心波長が固定されているので和周波光までも除去され
てしまうという問題がある。However, in the configuration of FIG. 2, the wavelength λ of the signal light is
Even if s changes and the angular frequency ω s changes, the central wavelength of the optical BPF 24 is fixed and therefore the sum frequency light is also removed.
【００１１】また、信号光の波長λs が変わり角周波数
ωs が変化して非線形結晶の最適位相整合角度（θopt,
φopt ）が変化しても、非線形結晶が固定されているた
め和周波光の発生効率が低下してしまうという問題があ
る。例として図６と図１０を参照して説明する。図１０
は角度φに対する和周波光発生の変換効率を示す図であ
る。図１０は例として非線形結晶１４として長さ３ｍｍ
のＫＴＰ結晶を使用し、ゲート光の波長を１５６０ｎｍ
一定とした場合に、信号光の波長が１５４０ｎｍと１３
１０ｎｍの時の第１種位相整合角度特性と変換効率η特
性を示したものである。Further, the wavelength λ s of the signal light changes, the angular frequency ω s changes, and the optimum phase matching angle (θ opt ,
Even if φ opt ) changes, there is a problem that the generation efficiency of the sum frequency light decreases because the nonlinear crystal is fixed. An example will be described with reference to FIGS. 6 and 10. Figure 10
FIG. 4 is a diagram showing conversion efficiency of sum frequency light generation with respect to an angle φ. FIG. 10 shows, as an example, a nonlinear crystal 14 having a length of 3 mm.
Using KTP crystal of, the wavelength of the gate light is 1560nm
When fixed, the wavelengths of the signal light are 1540 nm and 13
9 shows the first-type phase matching angle characteristic and the conversion efficiency η characteristic at 10 nm.
【００１２】図１０で、信号光の波長が１５４０ｎｍと
１３１０ｎｍの時の変換効率ηが最大となる角度φは４
１．０deg となる。図６は異なる信号光波長に対する非
線形結晶の位相整合角度（θ，φ）を示す図であるが、
図６によれば、信号光波長が１５４０ｎｍと１３１０ｎ
ｍの時の２本の第１種位相整合曲線は互いに平行位置に
あり、クロスポイントが存在しない。したがって波長の
異なる信号光を同時に満足する２つの最適位相整合角度
（θopt,φopt ）が存在しない状態を示している。In FIG. 10, the angle φ at which the conversion efficiency η is maximum when the signal light wavelengths are 1540 nm and 1310 nm is 4
It becomes 1.0 deg. FIG. 6 is a diagram showing the phase matching angles (θ, φ) of the nonlinear crystal for different signal light wavelengths.
According to FIG. 6, the signal light wavelengths are 1540 nm and 1310 n.
When m, the two type I phase matching curves are parallel to each other and there is no cross point. Therefore, there is shown a state where there are no two optimum phase matching angles (θ opt , φ opt ) that simultaneously satisfy the signal lights having different wavelengths.
【００１３】すなわち信号光波長が変化する場合は非線
形結晶の結晶軸(X,Y,Z )が信号光とゲート光に対して最
適位相整合角度（θopt,φopt ）を満足するように信号
光の波長ごとに角度調整する必要がある。さらに変換効
率ηが半分となるθ・φの角度許容量は図９よりそれぞ
れ１deg 、０．２deg であることから、角度調整には
０．２deg 以下の分解能が必要となる。That is, when the wavelength of the signal light changes, the signal is generated so that the crystal axes (X, Y, Z) of the nonlinear crystal satisfy the optimum phase matching angles (θ opt , φ opt ) for the signal light and the gate light. It is necessary to adjust the angle for each wavelength of light. Furthermore, since the angle permissible amounts of θ and φ at which the conversion efficiency η is halved are 1 deg and 0.2 deg, respectively, as shown in FIG. 9, a resolution of 0.2 deg or less is required for angle adjustment.
【００１４】図７は信号光波長が１３１０ｎｍと１５４
０ｎｍの時の最適位相整合角度で非線形結晶を固定した
後、信号光波長を１３００ｎｍから１６００ｎｍまで変
化させた時の和周波光発生の変換効率特性を示したもの
である。図７で信号波長が１３１０ｎｍと１５４０ｎｍ
からそれぞれ離れるにしたがって、和周波光発生の変換
効率ηが低下してしまうことがわかる。FIG. 7 shows that the signal light wavelengths are 1310 nm and 154.
It shows conversion efficiency characteristics of sum frequency light generation when the wavelength of the signal light is changed from 1300 nm to 1600 nm after the nonlinear crystal is fixed at the optimum phase matching angle of 0 nm. In FIG. 7, the signal wavelengths are 1310 nm and 1540 nm.
It is understood that the conversion efficiency η of the sum frequency light generation decreases with increasing distance from each.
【００１５】さらに、信号光の波長λs とゲート光の波
長λg が等しく、両光の角周波数ωs ・ωg が等しい場
合には、非線形結晶から出射する両光の第２高調波の角
周波数２ωs ・２ωg が和周波光の角周波数ωと等しく
なるので、光ＢＰＦにより第２高調波だけを除去するこ
とができないという問題がある。例として、図８を参照
して説明する。図８はゲート光波長を１５６０ｎｍと１
３００ｎｍの２種類とした時の信号光の波長変化に対す
る和周波光と、第２高調波の波長関係を示したものであ
る。図８で信号光波長がゲート光波長と一致すると両光
の第２高調波と和周波光の波長が同一となってしまうこ
とがわかる。この発明は広波長範囲の信号光の光パルス
波形を測定する光パルス波形測定器の提供を目的とす
る。Further, when the wavelength λ s of the signal light and the wavelength λ g of the gate light are equal and the angular frequencies ω s ω g of both lights are equal, the second harmonics of both lights emitted from the nonlinear crystal. Since the angular frequency 2ω s · 2ω g becomes equal to the angular frequency ω of the sum frequency light, there is a problem that only the second harmonic cannot be removed by the optical BPF. An example will be described with reference to FIG. Figure 8 shows that the gate light wavelength is 1560 nm and 1
It shows the wavelength relationship between the sum frequency light and the second harmonic with respect to the wavelength change of the signal light when two types of 300 nm are used. It can be seen from FIG. 8 that if the signal light wavelength matches the gate light wavelength, the second harmonic of both lights and the sum frequency light have the same wavelength. An object of the present invention is to provide an optical pulse waveform measuring device that measures the optical pulse waveform of signal light in a wide wavelength range.
【００１６】[0016]
【課題を解決するための手段】この目的を達成するた
め、この発明は、繰り返し周波数ｆ0 の電気信号を発生
する信号発生器１と、信号発生器１と同期して繰り返し
周波数ｆ0 −Δｆの電気信号を発生する信号発生器２
と、信号発生器１の出力を入力とし任意の角周波数ωs
で発振して信号光６ａを出射する信号光源６と、信号光
６ａを直線偏光にするＧＴプリズム９と、信号発生器２
の出力を入力とし一定の角周波数ωg で発振してゲート
光７ａを出射するゲート光源７と、ゲート光７ａを直線
偏光にする偏光ビームスプリッタ１０と、信号光６ａと
ゲート光７ａを同一光軸上に合波するビームスプリッタ
１１と、ビームスプリッタ１１の出射光を入射し、信号
光６ａとゲート光７ａの第２高調波１４ｂ・１４ｃと和
周波光１４ａを第１種位相整合により出射する非線形結
晶１４と、中心波長が可変し、非線形結晶１４の出力を
入力として、信号光６ａとゲート光７ａの両光の第２高
調波１４ｂ・１４ｃを除去して和周波光１４ａだけを透
過する光可変ＢＰＦ１９と、非線形結晶１４の角度を調
整する移動ステージ群１３と、非線形結晶１４が第１種
位相整合して信号光６ａとゲート光７ａの第２高調波１
４ｂ・１４ｃと和周波光１４ａを発生する最適位相整合
角度（θopt,φopt ）を記憶するＲＯＭ１６と、ＲＯＭ
１６の出力を入力とし、移動ステージ群１３を位置制御
する制御回路１５と、信号光源６の角周波数ωs に対応
した波長λs を入力し、光可変ＢＰＦ１９の中心周波数
を可変させるとともに、制御回路１５に与えるデータを
ＲＯＭ１６に設定する波長設定部１７と、光可変ＢＰＦ
１９を透過した和周波光１４ａの光強度に比例した電気
信号を出力する受光器２０と、信号発生器１・２からの
電気信号を入力とし、繰り返し周波数Δｆのトリガ信号
を発生するミキサ２３と、ミキサ２３からのトリガ信号
をトリガ入力とし電気信号を波形再生する表示部２２を
備える。Means for Solving the Problems] To achieve this object, the present invention is repeated a signal generator 1 for generating an electric signal having a frequency f 0, the signal generator 1 in synchronization with the repetition frequency f 0 -.DELTA.f Signal generator 2 for generating electric signals of
And the output of the signal generator 1 as an input, an arbitrary angular frequency ω s
Signal light source 6 that oscillates with the signal light 6a and emits the signal light 6a, a GT prism 9 that linearly polarizes the signal light 6a, and a signal generator 2
The light source 7 that oscillates at a constant angular frequency ω g and outputs the gate light 7a, the polarization beam splitter 10 that makes the gate light 7a linearly polarized, and the signal light 6a and the gate light 7a are the same light. The beam splitter 11 that is multiplexed on the axis and the light emitted from the beam splitter 11 are incident, and the signal light 6a, the second harmonics 14b and 14c of the gate light 7a, and the sum frequency light 14a are emitted by the first type phase matching. The non-linear crystal 14 and the central wavelength thereof are variable, and the output of the non-linear crystal 14 is used as an input to remove the second harmonics 14b and 14c of both the signal light 6a and the gate light 7a and transmit only the sum frequency light 14a. The variable optical BPF 19, the moving stage group 13 that adjusts the angle of the nonlinear crystal 14, and the nonlinear crystal 14 are phase-matched with each other by the first kind, and the second harmonic wave 1 of the signal light 6a and the gate light 7a is obtained.
4b and 14c and ROM 16 for storing optimum phase matching angles (θ opt , φ opt ) for generating sum frequency light 14a;
A control circuit 15 for controlling the position of the moving stage group 13 and a wavelength λ s corresponding to the angular frequency ω s of the signal light source 6 are input by using the output of 16 as an input, and the center frequency of the variable optical BPF 19 is varied and controlled. A wavelength setting unit 17 for setting data to be provided to the circuit 15 in the ROM 16, and an optical variable BPF.
A light receiver 20 that outputs an electric signal proportional to the light intensity of the sum frequency light 14a that has passed through 19, and a mixer 23 that receives the electric signal from the signal generators 1 and 2 and that generates a trigger signal with a repetition frequency Δf. , And a display unit 22 for reproducing a waveform of an electric signal by using a trigger signal from the mixer 23 as a trigger input.
【００１７】また、信号発生器２の出力を入力とし一定
の角周波数ωg1で発振してゲート光７ａを出射するゲー
ト光源７と、信号発生器２の出力を入力とし一定の角周
波数ωg2で発振してゲート光８ａを出射するゲート光源
８と、信号発生器２の出力を入力とし、第１の出力をゲ
ート光源７に接続し、第２の出力をゲート光源８に接続
して、波長設定部１７の指示により信号光６ａの角周波
数ωs に対応して駆動するゲート光源を切り換えるスイ
ッチ１８と、ゲート光源７・８の出力を合波してＰＢＳ
１０に出射する合波器１２を備える。Further, a gate light source 7 which receives the output of the signal generator 2 as an input and oscillates at a constant angular frequency ω g1 to emit the gate light 7a, and a constant angular frequency ω g2 which receives the output of the signal generator 2 as an input The gate light source 8 that oscillates at 8 to emit the gate light 8a and the output of the signal generator 2 are input, the first output is connected to the gate light source 7, and the second output is connected to the gate light source 8. In accordance with an instruction from the wavelength setting unit 17, the switch 18 that switches the gate light source to be driven corresponding to the angular frequency ω s of the signal light 6a and the output of the gate light sources 7 and 8 are combined to form a PBS.
A multiplexer 12 for emitting light to 10 is provided.
【００１８】光スイッチ１８は、信号光の波長λs とゲ
ート光の波長λg が等しく、両光の角周波数ωs ・ωg
が等しくなり、非線形結晶から出射する両光の第２高調
波の角周波数２ωs ・２ωg が和周波光の角周波数ωと
等しくなる時、ゲート光源を切り換える。In the optical switch 18, the wavelength λ s of the signal light and the wavelength λ g of the gate light are equal, and the angular frequencies ω s · ω g of both lights are
Are equal to each other and the angular frequencies 2ω s · 2ω g of the second harmonics of both lights emitted from the nonlinear crystal are equal to the angular frequency ω of the sum frequency light, the gate light source is switched.
【００１９】[0019]
【作用】次に、この発明による実施例の構成を図１に示
す。図１の５は駆動回路、８はゲート光源、１２は合波
器、１３は移動ステージ群、１５は制御回路、１６はＲ
ＯＭ、１７は波長設定部、１８はスイッチ、１９は光可
変ＢＰＦであり、他は図２と同じである。すなわち図１
の構成は、図２の光ＢＰＦ２４のかわりに光可変ＢＰＦ
１９を備え、非線形結晶１４に移動ステージ群１３を設
け、制御回路１５とＲＯＭ１６と波長設定部１７とスイ
ッチ１８と駆動回路５とゲート光源８と合波器１２を追
加したものである。移動ステージ群１３はθステージと
φステージを備えており、角度分解能０．１deg 以下が
容易に得られるパルスステージ等を用いる。The structure of an embodiment according to the present invention is shown in FIG. In FIG. 1, 5 is a drive circuit, 8 is a gate light source, 12 is a multiplexer, 13 is a moving stage group, 15 is a control circuit, and 16 is R.
OM, 17 is a wavelength setting unit, 18 is a switch, 19 is an optically variable BPF, and the others are the same as in FIG. That is, FIG.
The configuration of FIG. 2 is an optical variable BPF instead of the optical BPF 24 of FIG.
19, a moving stage group 13 is provided on the nonlinear crystal 14, and a control circuit 15, a ROM 16, a wavelength setting section 17, a switch 18, a drive circuit 5, a gate light source 8 and a multiplexer 12 are added. The moving stage group 13 includes a θ stage and a φ stage, and uses a pulse stage or the like that can easily obtain an angular resolution of 0.1 deg or less.
【００２０】次に、この発明による光パルス波形測定器
の動作を図１を参照して説明する。図１で、信号発生器
１は繰り返し周波数ｆ0 の電気信号を発生する。信号発
生器１からの電気信号は駆動回路３により増幅され、信
号光源６を駆動する。なお信号光源６は駆動回路３を含
む構成のものを使用してもよい。Next, the operation of the optical pulse waveform measuring device according to the present invention will be described with reference to FIG. In FIG. 1, the signal generator 1 generates an electric signal having a repetition frequency f 0 . The electric signal from the signal generator 1 is amplified by the drive circuit 3 and drives the signal light source 6. Note that the signal light source 6 may be configured to include the drive circuit 3.
【００２１】一方、信号発生器２は信号発生器１と同期
させた繰り返し周波数ｆ0 −Δｆの電気信号を発生す
る。信号発生器２からの電気信号はスイッチ１８に入力
される。スイッチ１８は、信号発生器２からの電気信号
を駆動回路４に入力するか駆動回路５に入力するか切り
換える。On the other hand, the signal generator 2 generates an electric signal having a repetition frequency f 0 -Δf synchronized with the signal generator 1. The electric signal from the signal generator 2 is input to the switch 18. The switch 18 switches between inputting the electric signal from the signal generator 2 to the drive circuit 4 or the drive circuit 5.
【００２２】信号発生器２の電気信号が駆動回路４に入
力された場合、駆動回路４は信号発生器２の電気信号を
増幅し、ゲート光源７を駆動する。ゲート光源７は一定
の角周波数ωg1で発振し、スイッチ１８により選択され
たゲート光源７の短パルス状のゲート光７ａを出射す
る。When the electric signal of the signal generator 2 is input to the drive circuit 4, the drive circuit 4 amplifies the electric signal of the signal generator 2 and drives the gate light source 7. The gate light source 7 oscillates at a constant angular frequency ω g1 and emits the short pulsed gate light 7a of the gate light source 7 selected by the switch 18.
【００２３】また、信号発生器２の電気信号が駆動回路
５に入力された場合、駆動回路５は信号発生器２の電気
信号を増幅し、ゲート光源８を駆動する。ゲート光源８
は一定の角周波数ωg2で発振し、スイッチ１８により選
択されたゲート光源８の短パルス状のゲート光８ａを出
射する。ゲート光源７・８の出射光は合波器１２を介し
てＰＢＳ１０に入射する。したがって、ＰＢＳ１０には
スイッチ１８で接続されたゲート光源のゲート光が入射
される。ＰＢＳ１０に入射したゲート光７ａ・８ａのど
ちらか一方は、ＰＢＳ１０により信号光源６の信号光６
ａと同一偏光方向の直線偏光となる。なお、信号光源６
と同様、ゲート光源７は駆動回路４を含む構成のものを
使用してもよく、またゲート光源８は駆動回路５を含む
構成のものを使用してもよい。When the electric signal of the signal generator 2 is input to the drive circuit 5, the drive circuit 5 amplifies the electric signal of the signal generator 2 and drives the gate light source 8. Gate light source 8
Oscillates at a constant angular frequency ω g2 and emits a short pulsed gate light 8a of the gate light source 8 selected by the switch 18. The light emitted from the gate light sources 7 and 8 enters the PBS 10 via the multiplexer 12. Therefore, the gate light of the gate light source connected by the switch 18 is incident on the PBS 10. Either one of the gate lights 7a and 8a incident on the PBS 10 is the signal light 6 of the signal light source 6 by the PBS 10.
It becomes linearly polarized light in the same polarization direction as a. The signal light source 6
Similarly to the above, the gate light source 7 may be configured to include the drive circuit 4, and the gate light source 8 may be configured to include the drive circuit 5.
【００２４】信号光源６は任意の角周波数ωs で発振す
る信号光６ａを出射し、信号光６ａはＧＴプリズム９に
より直線偏光となる。信号光源６の信号光６ａとＰＢＳ
１０の出射光はＢＳ１１により同一光軸上に合波された
後、非線形結晶１４に入射する。The signal light source 6 emits the signal light 6a which oscillates at an arbitrary angular frequency ω s , and the signal light 6a is linearly polarized by the GT prism 9. Signal light 6a of signal light source 6 and PBS
The emitted light of 10 is combined on the same optical axis by BS 11, and then enters the nonlinear crystal 14.
【００２５】非線形結晶１４は、スイッチ１８が駆動回
路４と接続された場合、角周波数ωs の信号光６ａと角
周波数ωg1のゲート光７ａを加算した角周波数ω＝ωs
＋ωg1の和周波光１４ａと、信号光６ａとゲート光７ａ
の両光の角周波数の２倍の角周波数に相当する２種類の
第２高調波１４ｂ・１４ｃを出射する。また、スイッチ
１８が駆動回路５と接続された場合、角周波数ωg2のゲ
ート光８ａの角周波数を加算した角周波数ω＝ωs ＋ω
g2の和周波光１４ａと、信号光６ａとゲート光８ａの両
光の角周波数の２倍の角周波数に相当する２種類の第２
高調波１４ｂ・１４ｃを出射する。なお、非線形結晶１
４は例えば無機系のＫＴＰ結晶や有機系のＮＰＰ結晶な
どを使用する。The nonlinear crystal 14, when the switch 18 is connected to a driving circuit 4, the angular frequency omega angular frequency of the gate light 7a by adding the s of the signal light 6a and the angular frequency ω g1 ω = ω s
+ Ω g1 sum frequency light 14a, signal light 6a, and gate light 7a
Two kinds of second harmonic waves 14b and 14c corresponding to an angular frequency twice the angular frequency of the two lights are emitted. When the switch 18 is connected to the drive circuit 5, the angular frequency ω = ω s + ω, which is the sum of the angular frequencies of the gate light 8a having the angular frequency ω g2.
g2 sum-frequency light 14a and two types of second frequencies corresponding to an angular frequency that is twice the angular frequency of both the signal light 6a and the gate light 8a.
The harmonics 14b and 14c are emitted. The nonlinear crystal 1
4 uses, for example, an inorganic KTP crystal or an organic NPP crystal.
【００２６】移動ステージ群１３は非線形結晶１４を固
定し、制御回路１５により角度制御される。ＲＯＭ１６
は、あらかじめ信号光源に可変波長光源等を用いて、信
号光６ａの波長に対応した非線形結晶１４の最適位相整
合角度（θopt,φopt ）を記憶させる。The moving stage group 13 fixes the non-linear crystal 14 and the angle is controlled by the control circuit 15. ROM16
Uses a variable wavelength light source or the like as the signal light source in advance to store the optimum phase matching angle (θ opt , φ opt ) of the nonlinear crystal 14 corresponding to the wavelength of the signal light 6a.
【００２７】光可変ＢＰＦ１９は、外部信号により中心
波長が可変でき、非線形結晶１４から出射される信号光
６ａおよびゲート光７ａ（あるいはゲート光８ａ）の両
光の第２高調波１４ｂ・１４ｃを除去して和周波光１４
ａだけを透過する。The variable optical BPF 19 can change the center wavelength by an external signal and removes the second harmonics 14b and 14c of both the signal light 6a and the gate light 7a (or the gate light 8a) emitted from the nonlinear crystal 14. Then sum frequency light 14
Only a is transmitted.
【００２８】波長設定部１７は図示を省略した外部入力
手段により信号光源６の角周波数ωs に対応した波長λ
s を入力し、移動ステージ群１３を制御する制御回路１
５へ信号光源６の波長変化に対応した最適位相整合角度
信号を出力するようにＲＯＭ１６にデータを設定すると
ともに、光可変ＢＰＦ１９に信号光源６の波長λs に対
応した中心波長の設定信号を送り、さらに、スイッチ１
８に信号光源６の波長λs に対応したゲート光源７・８
の切り換え信号を送る。The wavelength setting unit 17 uses a wavelength λ corresponding to the angular frequency ω s of the signal light source 6 by external input means (not shown).
Control circuit 1 for inputting s and controlling the moving stage group 13
5 sets the data in the ROM 16 so as to output the optimum phase matching angle signal corresponding to the wavelength change of the signal light source 6, and sends the setting signal of the central wavelength corresponding to the wavelength λ s of the signal light source 6 to the optical variable BPF 19. , And switch 1
8 is a gate light source 7.8 corresponding to the wavelength λ s of the signal light source 6.
Send the switching signal of.
【００２９】受光器２０は光可変ＢＰＦ１９を透過した
和周波光１４ａの光強度に比例した電気信号を出力し、
アンプ２１は出力された電気信号を増幅する。以下、図
２と同様の動作により、表示部２２にミキサ２３からの
トリガ信号をトリガ入力として与え、アンプ２１からの
増幅電気信号を波形再生することにより、信号光６ａの
光パルス波形の時間軸はｆ0 ／Δｆ倍に拡大され、受光
器２０の帯域に制限されることなく、高速な信号光６ａ
の光パルス波形を観測する。The light receiver 20 outputs an electric signal proportional to the light intensity of the sum frequency light 14a transmitted through the light variable BPF 19,
The amplifier 21 amplifies the output electric signal. Hereinafter, by the same operation as in FIG. 2, the trigger signal from the mixer 23 is applied to the display unit 22 as a trigger input, and the amplified electric signal from the amplifier 21 is waveform-reproduced, whereby the time axis of the optical pulse waveform of the signal light 6a is obtained. Is expanded to f 0 / Δf times, and the high-speed signal light 6a is not limited to the band of the photodetector 20.
Observe the optical pulse waveform of.
【００３０】[0030]
【発明の効果】この発明によれば、ＲＯＭに信号光の波
長に対応した非線形結晶の最適位相整合角度（θopt,φ
opt ）をあらかじめ記憶し、波長設定部から波長設定信
号を与えて、ＲＯＭから制御回路へ最適位相整合角度信
号を送り、移動ステージ群を制御することにより、少な
くとも１３１０ｎｍから１５４０ｎｍの波長に対応した
任意の角周波数で発振する信号光源の信号光に対して、
非線形結晶を常に最適位相整合角度で第１種位相整合さ
せ、効率よく和周波光を発生させるとともに、光可変Ｂ
ＰＦに波長設定部から外部信号を与えて中心波長を制御
することにより、任意の角周波数で発振する信号光に対
して和周波光だけをとりだすことが可能となるので、広
波長範囲で高速な光パルス波形の測定が可能となる。According to the present invention, the optimum phase matching angle (θ opt , φ of the nonlinear crystal corresponding to the wavelength of the signal light is stored in the ROM.
opt ) is stored in advance, the wavelength setting signal is given from the wavelength setting unit, the optimum phase matching angle signal is sent from the ROM to the control circuit, and the movable stage group is controlled, so that an arbitrary wavelength corresponding to at least 1310 nm to 1540 nm can be obtained. For the signal light of the signal light source that oscillates at the angular frequency of
The nonlinear crystal is always phase-matched with the first kind at the optimum phase-matching angle to efficiently generate the sum frequency light, and the optical variable B
By giving an external signal to the PF from the wavelength setting unit to control the center wavelength, it is possible to take out only the sum frequency light from the signal light oscillating at an arbitrary angular frequency, so that it is possible to achieve high speed in a wide wavelength range. It is possible to measure the optical pulse waveform.
【００３１】さらに波長の異なるゲート光源を２台設置
し、波長設定部からの切り替え信号によりゲート光源の
切り替えが可能となるため、ゲート光と同一波長の信号
光についても測定が可能となる。Furthermore, since two gate light sources having different wavelengths are installed and the gate light source can be switched by the switching signal from the wavelength setting section, it is possible to measure the signal light having the same wavelength as the gate light.
【図１】この発明の実施例を示す構成図である。FIG. 1 is a configuration diagram showing an embodiment of the present invention.
【図２】従来の実施例を示す構成図である。FIG. 2 is a configuration diagram showing a conventional embodiment.
【図３】繰り返し周波数がΔｆ(Hz)ずれていた時の信号
光とゲート光の関係図である。FIG. 3 is a relationship diagram between signal light and gate light when the repetition frequency is deviated by Δf (Hz).
【図４】サンプリングされた信号光の光波形図である。FIG. 4 is an optical waveform diagram of sampled signal light.
【図５】入射ビームの光軸と位相整合角度との模式図
（θopt,φopt）である。FIG. 5 is a schematic diagram (θ opt , φ opt ) of an optical axis of an incident beam and a phase matching angle.
【図６】異なる信号光波長に対する非線形結晶の位相整
合角度（θ,φ）である。FIG. 6 is a phase matching angle (θ, φ) of a nonlinear crystal for different signal light wavelengths.
【図７】固定された非線形結晶の異なる信号光波長に対
する和周波光発生の変換効率を示す図である。FIG. 7 is a diagram showing conversion efficiency of sum frequency light generation for different signal light wavelengths of a fixed nonlinear crystal.
【図８】信号光波長に対する和周波光と第２高調波の関
係図である。FIG. 8 is a relationship diagram of the sum frequency light and the second harmonic with respect to the signal light wavelength.
【図９】θ、φの許容角度特性を示す図である。FIG. 9 is a diagram showing allowable angle characteristics of θ and φ.
【図１０】φに対する和周波光発生の変換効率を示す図
である。FIG. 10 is a diagram showing conversion efficiency of sum frequency light generation with respect to φ.
１・２ 信号発生器 ３・４・５ 駆動回路 ６ 信号光源 ７・８ ゲート光源 ９ ＧＴプリズム １０ ＰＢＳ １１ ＢＳ １２ 合波器 １３ 移動ステージ群 １４ 非線形結晶 １５ 制御回路 １６ ＲＯＭ １７ 波長設定部 １８ スイッチ １９ 光可変ＢＰＦ ２０ 受光器 ２１ アンプ ２２ 表示部 ２３ ミキサ 1.2 signal generator 34.5 driving circuit 6 signal light source 7/8 gate light source 9 GT prism 10 PBS 11 BS 12 multiplexer 13 moving stage group 14 nonlinear crystal 15 control circuit 16 ROM 17 wavelength setting unit 18 switch 19 Optically variable BPF 20 Optical receiver 21 Amplifier 22 Display unit 23 Mixer
Claims (3)
る第１の信号発生器(1) と、 信号発生器(1) と同期して繰り返し周波数ｆ0 −Δｆの
電気信号を発生する第２の信号発生器(2) と、 信号発生器(1) の出力を入力とし任意の角周波数ωs で
発振して信号光(6a)を出射する信号光源(6) と、 信号光(6a)を直線偏光にするグラン・テイラー偏光プリ
ズム(9) と、 信号発生器(2) の出力を入力とし、一定の角周波数ωg
で発振してゲート光(7a)を出射するゲート光源(7) と、 ゲート光(7a)を直線偏光にする偏光ビームスプリッタ(1
0)と、 信号光(6a)とゲート光(7a)を同一光軸上に合波するビー
ムスプリッタ(11)と、 ビームスプリッタ(11)の出射光を入射し、信号光(6a)と
ゲート光(7a)の第２高調波(14b,14c) と和周波光(14a)
を第１種位相整合により出射する非線形結晶(14)と、 中心波長が可変し、非線形結晶(14)の出力を入力とし
て、信号光(6a)とゲート光(7a・8a) の両光の第２高調波
(14b・14c) を除去して和周波光(14a) だけを透過する光
可変ＢＰＦ(19)と、 非線形結晶(14)の角度を調整する移動ステージ群(13)
と、非線形結晶(14)が第１種位相整合して信号光(6a)と
ゲート光(7a)の第２高調波(14b・14c) と和周波光(14a)
を発生する最適位相整合角度（θopt,φopt ）を記憶す
るＲＯＭ(16)と、ＲＯＭ(16)の出力を入力とし、移動ス
テージ群(13)を位置制御する制御回路(15)と、 信号光源(6) の角周波数ωs に対応した波長λs を入力
し、光可変ＢＰＦ(19)の中心周波数を可変させるととも
に、制御回路(15)に与えるデータをＲＯＭ(16)に設定す
る波長設定部(17)と、 光可変ＢＰＦ(19)を透過した和周波光(14a) の光強度に
比例した電気信号を出力する受光器(20)と、 信号発生器(1・2) からの電気信号を入力とし、繰り返し
周波数Δｆのトリガ信号を発生するミキサ(23)と、 ミキサ(23)からのトリガ信号をトリガ入力とし電気信号
を波形再生する表示部(22)を備えることを特徴とする光
パルス波形測定器。1. A first signal generator (1) for generating an electric signal of a repetition frequency f 0 , and a second signal generator (1) for generating an electric signal of a repetition frequency f 0 -Δf in synchronization with the signal generator (1). Signal light source (6) that oscillates at the arbitrary angular frequency ω s and emits the signal light (6a), and the signal light (6a) and the Gran Taylor polarizing prism to linearly polarized light (9), receives the output of the signal generator (2), a constant angular frequency omega g
The gate light source (7) that oscillates at and emits the gate light (7a) and the polarization beam splitter (1
0), the signal light (6a) and the gate light (7a) are combined on the same optical axis, the beam splitter (11) and the light emitted from the beam splitter (11) are incident, and the signal light (6a) and the gate are input. Second harmonic (14b, 14c) of light (7a) and sum frequency light (14a)
The non-linear crystal (14) that emits light by the first-type phase matching, and the central wavelength is variable, and the output of the non-linear crystal (14) is used as an input for both the signal light (6a) and the gate light (7a ・ 8a). Second harmonic
Optical variable BPF (19) that removes (14b ・ 14c) and transmits only sum frequency light (14a), and moving stage group (13) that adjusts the angle of the nonlinear crystal (14)
And the nonlinear crystal (14) is phase-matched to the first kind and the second harmonics (14b and 14c) of the signal light (6a) and the gate light (7a) and the sum frequency light (14a)
ROM (16) that stores the optimum phase matching angle (θ opt , φ opt ) that generates the, and a control circuit (15) that controls the position of the moving stage group (13) by using the output of the ROM (16) as an input, The wavelength λ s corresponding to the angular frequency ω s of the signal light source (6) is input, the center frequency of the variable optical BPF (19) is changed, and the data to be given to the control circuit (15) is set in the ROM (16). From the wavelength setting part (17), the light receiver (20) that outputs an electrical signal proportional to the light intensity of the sum frequency light (14a) that has passed through the variable optical BPF (19), and the signal generator (1 ・ 2) It is equipped with a mixer (23) which receives the electric signal of (3) as an input and generates a trigger signal of a repetition frequency Δf, and a display section (22) which receives the trigger signal from the mixer (23) as a trigger input and reproduces the waveform of the electric signal. And optical pulse waveform measuring instrument.
角周波数ωg1で発振してゲート光(7a)を出射する第１の
ゲート光源(7) と、 信号発生器(2) の出力を入力とし一定の角周波数ωg2で
発振してゲート光(8a)を出射する第２のゲート光源(8)
と、 信号発生器(2) の出力を入力とし、第１の出力を第１の
ゲート光源(7) に接続し、第２の出力を第２のゲート光
源(8) に接続して、波長設定部(17)の指示により信号光
(6a)の角周波数ωs に対応して駆動するゲート光源を切
り換えるスイッチ(18)と、 ゲート光源(7・8) の出力を合波してＰＢＳ(10)に出射す
る合波器(12)を備えることを特徴とする請求項１に記載
の光パルス波形測定器。2. A first gate light source (7) which receives the output of a signal generator (2) as an input and oscillates at a constant angular frequency ω g1 to emit a gate light (7a), and a signal generator (2). Gate light source (8) that oscillates at a constant angular frequency ω g2 and emits gate light (8a) with the output of
, The output of the signal generator (2) is input, the first output is connected to the first gate light source (7), the second output is connected to the second gate light source (8), Signal light according to the setting section (17)
The switch (18) that switches the gate light source to be driven corresponding to the angular frequency ω s of (6a) and the multiplexer (12) that multiplexes the outputs of the gate light sources (7, 8) and outputs them to the PBS (10). ) Is provided, The optical pulse waveform measuring instrument of Claim 1 characterized by the above-mentioned.
が等しく、両光の角周波数ωs ・ωg が等しくなり、非
線形結晶から出射する両光の第２高調波の角周波数２ω
s ・２ωg が和周波光の角周波数ωと等しくなる時、ス
イッチ(18)によりゲート光源を切り換えることを特徴と
する請求項２に記載の光パルス波形測定器。3. The wavelength of signal light λ s and the wavelength of gate light λ g
Are equal, the angular frequencies ω s · ω g of both lights are equal, and the angular frequency 2ω of the second harmonic of both lights emitted from the nonlinear crystal is
When s · 2 [omega g is equal to the angular frequency ω of the sum frequency light, the optical pulse waveform measuring device according to claim 2, wherein the switching the gate source by the switch (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6501195A JPH08233662A (en) | 1995-02-28 | 1995-02-28 | Light pulse waveform measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6501195A JPH08233662A (en) | 1995-02-28 | 1995-02-28 | Light pulse waveform measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08233662A true JPH08233662A (en) | 1996-09-13 |
Family
ID=13274622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6501195A Pending JPH08233662A (en) | 1995-02-28 | 1995-02-28 | Light pulse waveform measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08233662A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6980290B2 (en) | 2001-08-28 | 2005-12-27 | Yokogawa Electric Corporation | Optical sampling waveform measuring apparatus |
| WO2008146684A1 (en) * | 2007-05-25 | 2008-12-04 | Anritsu Corporation | Optical signal sampling device and its method, and optical monitor device using same and its method |
| CN101876571A (en) * | 2010-06-08 | 2010-11-03 | 中国科学院上海光学精密机械研究所 | Pulse replicating loop device used for improving single nanosecond pulse measurement dynamic range |
-
1995
- 1995-02-28 JP JP6501195A patent/JPH08233662A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6980290B2 (en) | 2001-08-28 | 2005-12-27 | Yokogawa Electric Corporation | Optical sampling waveform measuring apparatus |
| WO2008146684A1 (en) * | 2007-05-25 | 2008-12-04 | Anritsu Corporation | Optical signal sampling device and its method, and optical monitor device using same and its method |
| JPWO2008146684A1 (en) * | 2007-05-25 | 2010-08-19 | アンリツ株式会社 | Optical signal sampling apparatus and method, and optical signal monitoring apparatus and method using the same |
| US8050558B2 (en) | 2007-05-25 | 2011-11-01 | Anritsu Corporation | Optical signal sampling apparatus and method and optical signal monitor apparatus and method using the same |
| JP5380647B2 (en) * | 2007-05-25 | 2014-01-08 | アンリツ株式会社 | Optical signal sampling apparatus and method, and optical signal monitoring apparatus and method using the same |
| CN101876571A (en) * | 2010-06-08 | 2010-11-03 | 中国科学院上海光学精密机械研究所 | Pulse replicating loop device used for improving single nanosecond pulse measurement dynamic range |
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