JP3384322B2 - Chromatic dispersion measuring method and chromatic dispersion measuring device - Google Patents
Chromatic dispersion measuring method and chromatic dispersion measuring deviceInfo
- Publication number
- JP3384322B2 JP3384322B2 JP11313498A JP11313498A JP3384322B2 JP 3384322 B2 JP3384322 B2 JP 3384322B2 JP 11313498 A JP11313498 A JP 11313498A JP 11313498 A JP11313498 A JP 11313498A JP 3384322 B2 JP3384322 B2 JP 3384322B2
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- optical
- optical signal
- wavelength
- delay time
- chromatic dispersion
- Prior art date
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、波長分散測定方法
及び波長分散測定装置に関する。TECHNICAL FIELD The present invention relates to a chromatic dispersion measuring method and a chromatic dispersion measuring apparatus.
【０００２】図３は従来の波長分散測定方法を適用した
波長分散測定装置の概念図である。FIG. 3 is a conceptual diagram of a chromatic dispersion measuring apparatus to which a conventional chromatic dispersion measuring method is applied.
【０００３】ここで波長分散とは、光源が発する光信号
の波長が変化したときの光の伝搬時間が異なる現象をい
う。Here, chromatic dispersion refers to a phenomenon in which the propagation time of light changes when the wavelength of an optical signal emitted from a light source changes.
【０００４】波長分散測定装置は、可変波長レーザ光源
（ＬＤ）１３と、光変調器（ＭＯＤ）１４と、発振器１
７と、光受信器（Ｏ／Ｅ）１６と、位相検出器１８とで
構成される。位相検出器１８としては、ベクトルボルト
メータやネットワークアナライザが用いられる。The wavelength dispersion measuring apparatus comprises a variable wavelength laser light source (LD) 13, an optical modulator (MOD) 14, and an oscillator 1.
7, an optical receiver (O / E) 16 and a phase detector 18. A vector voltmeter or a network analyzer is used as the phase detector 18.
【０００５】この波長分散測定装置が作動すると、可変
波長レーザ光源１３から出力されるレーザ光を光変調器
１４へ入力し、発振器１７から出力される一定周波数Ｆ
の信号により光変調する。この変調光を被測定デバイス
１５へ入力し、被測定デバイス１５から出力される光信
号を光受信器１６により電気信号に変換した後、位相検
出器１８により出力信号の位相情報を読み取る。When the chromatic dispersion measuring apparatus operates, the laser light output from the variable wavelength laser light source 13 is input to the optical modulator 14, and the constant frequency F output from the oscillator 17 is input.
The light is modulated by the signal. This modulated light is input to the device under test 15, the optical signal output from the device under test 15 is converted into an electrical signal by the optical receiver 16, and then the phase information of the output signal is read by the phase detector 18.
【０００６】次に可変波長レーザ光源１３の波長を変化
させて同様の測定を繰り返し光源波長と出力位相との関
係を求める。Next, the wavelength of the variable wavelength laser light source 13 is changed and the same measurement is repeated to find the relationship between the light source wavelength and the output phase.
【０００７】ここで、位相変化Δφと遅延時間Δτと
は、Δτ＝１／Δφ・Ｆ・３６０の関係にあるため、簡
単に遅延時間の波長依存性、すなわち波長分散を求める
ことができる（位相検出法）。Since the phase change Δφ and the delay time Δτ have a relationship of Δτ = 1 / Δφ · F · 360, the wavelength dependence of the delay time, that is, the chromatic dispersion can be easily obtained (phase Detection method).
【０００８】[0008]
【発明が解決しようとする課題】ところで、光デバイス
は、周囲温度が変化すると屈折率の温度依存性などによ
って遅延時間が変動する。前述した位相検出法は、光源
波長を変化させながら被測定デバイスの遅延時間を求め
ているため、測定中に周囲温度が変化したり、温度変化
の大きいデバイスを測定したりする場合には、温度によ
る遅延変動が誤差として加わるため、正確な波長分散
（遅延時間の波長依存性）を測定することができなかっ
た。By the way, in an optical device, when the ambient temperature changes, the delay time changes due to the temperature dependence of the refractive index and the like. The phase detection method described above calculates the delay time of the device under test while changing the light source wavelength, so if the ambient temperature changes during measurement or a device with large temperature changes is measured, the temperature Since the delay variation due to the error is added as an error, accurate chromatic dispersion (wavelength dependence of delay time) cannot be measured.
【０００９】例えば光ファイバは、遅延時間の温度依存
性として約０．０３〜０．０４ｐｓ／℃ｍあるため、長
さ１ｋｍのファイバにおいて１℃温度変化すると遅延時
間は３０〜４０ｐｓ変化することになる。そのため、特
に長尺光ファイバでは安定した測定結果を得ることが難
しかった。For example, an optical fiber has a temperature dependence of delay time of about 0.03 to 0.04 ps / ° C. Therefore, if the temperature of the fiber having a length of 1 km changes by 1 ° C, the delay time changes by 30 to 40 ps. Become. Therefore, it has been difficult to obtain stable measurement results especially with a long optical fiber.
【００１０】また波長多重と高速時分割多重を用いて光
信号のまま高速スイッチング処理を行う光交換機では、
使用する光コンポーネントに対して波長依存性の遅延時
間を数ｐｓ以下に抑える必要がある。そのため、前述し
た従来方法ではわずかな温度変化によって遅延が変動す
るので、正確な測定ができないという問題があった。Further, in an optical switch that performs high-speed switching processing with optical signals using wavelength multiplexing and high-speed time division multiplexing,
It is necessary to suppress the wavelength-dependent delay time to several ps or less for the optical component used. Therefore, in the above-mentioned conventional method, the delay changes due to a slight temperature change, so that there is a problem that accurate measurement cannot be performed.
【００１１】そこで、本発明の目的は、上記課題を解決
し、周囲温度の影響を受けないで高精度に波長分散を求
めることができる波長分散測定方法及び波長分散測定装
置を提供することにある。Therefore, an object of the present invention is to solve the above problems and provide a chromatic dispersion measuring method and a chromatic dispersion measuring apparatus capable of obtaining chromatic dispersion with high accuracy without being affected by ambient temperature. .
【００１２】[0012]
【００１３】[0013]
【課題を解決するための手段】上記目的を達成するため
に本発明の波長分散測定方法は、光デバイスの波長分散
を測定する方法において、基準波長の光信号と測定波長
の光信号とを同一の電気信号により変調し、遅延器によ
り基準波長の光信号の変調光と測定波長の光信号の変調
光との間に一定の遅延時間を与えた後、光合成器により
合成して被測定デバイスへ入力する系を準備し、ネット
ワークアナライザによりその系に被測定デバイスを挿入
した時にその系から出力される光信号の遅延時間とその
系に被測定デバイスを挿入しない時にその系から出力さ
れる光信号の遅延時間との差から基準波長と測定波長と
の間の遅延時間差を求めることにより波長分散を求める
ものである。[Means for Solving the Problems] To achieve the above object
In the chromatic dispersion measuring method of the present invention, in the method of measuring the chromatic dispersion of an optical device, the optical signal of the reference wavelength and the optical signal of the measurement wavelength are modulated by the same electric signal, and the optical signal of the reference wavelength is delayed by the delay device. After a certain delay time is applied between the modulated light of and the modulated light of the optical signal of the measurement wavelength, prepare a system to be combined by the optical combiner and input to the device under test, and measure the system under measurement with the network analyzer. From the difference between the delay time of the optical signal output from the system when the device is inserted and the delay time of the optical signal output from the system when the device under test is not inserted into the system, between the reference wavelength and the measurement wavelength The chromatic dispersion is obtained by obtaining the difference in the delay times.
【００１４】本発明の波長分散測定方法は、光デバイス
の波長分散を測定する方法において、広帯域白色光源か
らの白色光を光変調器により変調し、光分波器により変
調光の中から二つの波長成分に分波し、分波された一方
の波長成分の光信号を遅延器により遅延させ、遅延した
光信号と分波された他方の波長成分の光信号とを光合成
器により合成し、合成した信号光を被測定デバイスへ入
力する系を準備し、ネットワークアナライザによりその
系に被測定デバイスを挿入した時にその系から出力され
る光信号の遅延時間とその系に被測定デバイスを挿入し
ない時にその系から出力される光信号の遅延時間との差
から基準波長と測定波長との間の遅延時間差を求めるこ
とにより波長分散を求めるものである。The chromatic dispersion measuring method of the present invention is a method of measuring chromatic dispersion of an optical device, wherein white light from a broadband white light source is modulated by an optical modulator, and an optical demultiplexer selects two of the modulated lights. Wavelength components are demultiplexed, the demultiplexed optical signal of one wavelength component is delayed by a delay device, and the delayed optical signal and the demultiplexed optical signal of the other wavelength component are combined by an optical combiner, and combined. Prepare a system for inputting the measured signal light to the device under test, and when the device under test is inserted into the system by the network analyzer, the delay time of the optical signal output from the system and when the device under test is not inserted in the system The chromatic dispersion is obtained by obtaining the delay time difference between the reference wavelength and the measurement wavelength from the difference with the delay time of the optical signal output from the system.
【００１５】[0015]
【００１６】本発明の波長分散測定装置は、光デバイス
の波長分散を測定する装置において、基準波長の光信号
を発生する光源と、測定波長の光信号を発生する光源
と、両光源からの光信号を同一の電気信号によりそれぞ
れ変調する変調器と、基準波長の光信号の変調光に一定
の遅延時間を与える遅延器と、遅延器からの変調光と測
定波長の光信号の変調光とを合成し被測定デバイスへ入
力する光合成器と、光合成器に接続された被測定デバイ
スから出力される光信号を電気信号に変換する光受信器
と、被測定デバイスが光合成器と光受信器との間に挿入
された時の光信号の遅延時間と被測定デバイスが光合成
器と光受信器との間に挿入されていない時の光信号の遅
延時間との差から基準波長と測定波長との間の遅延時間
差を求めることにより波長分散を求めるネットワークア
ナライザとを備えたものである。The chromatic dispersion measuring apparatus of the present invention is an apparatus for measuring chromatic dispersion of an optical device, wherein a light source for generating an optical signal of a reference wavelength, a light source for generating an optical signal of a measuring wavelength, and light from both light sources. A modulator that modulates each signal with the same electric signal, a delay device that gives a fixed delay time to the modulated light of the optical signal of the reference wavelength, the modulated light from the delay device and the modulated light of the optical signal of the measurement wavelength. An optical combiner that synthesizes and inputs to the device under test, an optical receiver that converts the optical signal output from the device under test connected to the optical combiner into an electrical signal, and the device under test is an optical combiner and an optical receiver. Between the reference wavelength and the measurement wavelength from the difference between the delay time of the optical signal when it is inserted in between and the delay time of the optical signal when the device under test is not inserted between the optical combiner and the optical receiver. By calculating the delay time difference of It is obtained by a network analyzer to determine the wavelength dispersion.
【００１７】本発明の波長分散測定装置は、光デバイス
の波長分散を測定する装置において、白色光を発生する
広帯域白色光源と、白色光を変調する光変調器と、変調
された白色光の中から二つの波長成分に分波する光分波
器と、分波された一方の波長成分の光信号を遅延させる
遅延器と、遅延した光信号と分波された他方の波長成分
の光信号とを合成する光合成器と、光合成器に接続され
た被測定デバイスから出力される光信号を電気信号に変
換する光受信器と、被測定デバイスが光合成器と光受信
器との間に挿入された時の光信号の遅延時間と被測定デ
バイスが光合成器と光受信器との間に挿入されていない
時の光信号の遅延時間との差から基準波長と測定波長と
の間の遅延時間差を求めることにより波長分散を求める
ネットワークアナライザとを備えたものである。The chromatic dispersion measuring apparatus of the present invention is an apparatus for measuring chromatic dispersion of an optical device, which includes a broadband white light source for generating white light, an optical modulator for modulating white light, and a modulated white light. From the optical demultiplexer into two wavelength components, a delay device that delays the demultiplexed optical signal of one wavelength component, and a delayed optical signal and the demultiplexed optical signal of the other wavelength component An optical combiner for combining the optical combiner, an optical receiver for converting an optical signal output from the device under test connected to the optical combiner into an electric signal, and the device under test inserted between the optical combiner and the optical receiver. The delay time difference between the reference wavelength and the measurement wavelength is calculated from the difference between the delay time of the optical signal and the delay time of the optical signal when the device under test is not inserted between the optical combiner and the optical receiver. Network analyzer that seeks chromatic dispersion by It is that a organizer.
【００１８】本発明によれば、基準波長の光信号と測定
波長の光信号とを同一の電気信号により変調し、遅延器
により基準波長の光信号の変調光と測定波長の光信号の
変調光との間に一定の遅延時間を与えた後、光合成器に
より合成して二つの光信号を同時に被測定デバイスへ入
力する。このため、遅延時間差Δτが数ｐｓと非常に小
さい遅延時間の場合でも、一方の変調光信号に遅延τde
lay を加えて、τdelay ＋Δτとなる。被測定デバイス
を挿入する前の遅延時間τdelay との差をとることによ
り高精度にΔτを求めることができる。 According to the present invention, an optical signal of a reference wavelength and measurement
The optical signal of the wavelength is modulated by the same electric signal,
Of the modulated light of the reference wavelength optical signal and the measured wavelength of the optical signal
After giving a fixed delay time to the modulated light,
And combine two optical signals into the device under test at the same time.
Force Therefore, the delay time difference Δτ is as small as a few ps.
Even if the delay time is too short, the delay τde
lay is added to obtain τdelay + Δτ. Device under test
Is calculated by taking the difference from the delay time τdelay before inserting
Therefore, Δτ can be obtained with high accuracy.
【００１９】[0019]
【発明の実施の形態】以下、本発明の実施の形態を添付
図面に基づいて詳述する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
【００２０】[0020]
【００２１】[0021]
【００２２】[0022]
【００２３】[0023]
【００２４】[0024]
【００２５】[0025]
【００２６】[0026]
【００２７】図１は本発明の波長分散測定方法を適用し
た波長分散測定装置の一実施の形態を示す概念図であ
る。FIG. 1 is a conceptual diagram showing an embodiment of a chromatic dispersion measuring apparatus to which the chromatic dispersion measuring method of the present invention is applied.
【００２８】[0028]
【００２９】この波長分散測定装置は、基準波長の光信
号を出力する第１の光源１ａと、第１の光源１ａからの
光信号を変調する第１の光変調器７ａと、測定波長の光
信号を出力する第２の光源１ｂと、第２の光源１ｂから
の光信号を変調する第２の光変調器７ｂと、第１の光変
調器７ａに接続され基準波長の光信号の変調光と測定波
長の光信号の変調光との間に一定の遅延時間を与える遅
延器８と、一定の遅延時間を有する基準波長の光信号の
変調光と測定波長の光信号の変調光とを合成して被測定
デバイス４へ入力する光合成器２と、被測定デバイス４
から出力される光信号を電気信号に変換する光受信器５
と、被測定デバイス４が光合成器２と光受信器５との間
に挿入された時の光信号の遅延時間と被測定デバイス４
が光合成器２と光受信器５との間に挿入されていない時
の光信号の遅延時間との差から基準波長と測定波長との
間の遅延時間差を求めることにより波長分散を求めるネ
ットワークアナライザ６と、ネットワークアナライザ６
からの信号を両光変調器７ａ、７ｂに分配する２分配器
（ＤＩＶ）９とで構成されている。This chromatic dispersion measuring apparatus comprises a first light source 1a which outputs an optical signal of a reference wavelength, a first optical modulator 7a which modulates an optical signal from the first light source 1a, and a light of a measuring wavelength. A second light source 1b that outputs a signal, a second optical modulator 7b that modulates the optical signal from the second light source 1b, and a modulated light of an optical signal of a reference wavelength that is connected to the first optical modulator 7a. And the modulated light of the optical signal of the measurement wavelength, a delay device 8 which gives a constant delay time, and the modulated light of the optical signal of the reference wavelength and the modulated light of the optical signal of the measurement wavelength, which have a constant delay time. And the photosynthesizer 2 for inputting to the device under test 4 and the device under test 4
Optical receiver 5 for converting the optical signal output from the optical signal into an electrical signal
And the delay time of the optical signal when the device under test 4 is inserted between the optical combiner 2 and the optical receiver 5 and the device under test 4
A network analyzer 6 that obtains chromatic dispersion by obtaining the delay time difference between the reference wavelength and the measurement wavelength from the difference between the delay time of the optical signal when not being inserted between the optical combiner 2 and the optical receiver 5. And a network analyzer 6
And a two-divider (DIV) 9 that divides the signal from the two optical modulators 7a and 7b.
【００３０】ここで、図３に示した波長分散測定装置の
構成では、遅延時間差τが数ｐｓと非常に小さい遅延時
間の場合、最小の零点周波数でも数百ＧＨｚと非常に高
い周波数となる。これは、一般的な光変調器、光受信
器、ネットワークアナライザは動作しない周波数領域で
あり、波長分散を測定することができなかった。Here, in the configuration of the chromatic dispersion measuring apparatus shown in FIG. 3 , when the delay time difference τ is as small as several ps and the delay time is very small, even the minimum zero point frequency is as high as several hundred GHz. This is a frequency region in which general optical modulators, optical receivers, and network analyzers do not operate, and chromatic dispersion could not be measured.
【００３１】そこで、一方の変調光信号に遅延τdelay
を加えて、予め測定可能な零点周波数が発生するように
構成することにより、図１に示した波長分散測定装置と
同様にして求められる遅延時間は、遅延器による遅延τ
delay に遅延時間Δτを加えたτdelay ＋Δτとなる。
被測定デバイスを挿入する前の遅延時間τdelay との差
をとることによりΔτを求めることができる。Therefore, one modulated optical signal has a delay τ delay.
In addition, the delay time obtained in the same manner as in the chromatic dispersion measuring apparatus shown in FIG. 1 is configured so that a measurable zero-point frequency is generated in advance.
It is τ delay + Δτ, which is the delay plus the delay time Δτ.
Δτ can be obtained by taking the difference from the delay time τ delay before inserting the device under test.
【００３２】これにより、温度に依存しないで、かつ高
精度に波長分散を求めることが可能となる。This makes it possible to obtain chromatic dispersion with high accuracy without depending on temperature.
【００３３】図２は本発明の波長分散測定方法を適用し
た波長分散測定装置の他の実施の形態を示す概念図であ
る。FIG. 2 is a conceptual diagram showing another embodiment of the chromatic dispersion measuring apparatus to which the chromatic dispersion measuring method of the present invention is applied.
【００３４】図１に示した波長分散測定装置との相違点
は、光変調器を一つにした点である。The difference from the chromatic dispersion measuring apparatus shown in FIG. 1 is that only one optical modulator is used.
【００３５】波長分散測定は、白色光を発生する広帯域
光源１０と、広帯域光源１０からの白色光を変調する光
変調器１１と、変調光の中から二つの波長成分に分波す
る光分波器（ＷＤＭ）１２と、分波された一方の波長成
分の光信号を遅延させる遅延器８と、遅延した光信号と
分波された他方の波長成分の光信号とを合成し、合成し
た信号光を被測定デバイス４へ入力する光合成器２と、
被測定デバイス４から出力される光信号を電気信号に変
換する光受信器５と、被測定デバイス４が光合成器２と
光受信器５との間に挿入された時の光信号の遅延時間と
被測定デバイス４が光合成器２と光受信器５との間に挿
入されていない時の光信号の遅延時間との差から基準波
長と測定波長との間の遅延時間差を求めることにより波
長分散を求めるネットワークアナライザ６とで構成され
ている。The wavelength dispersion measurement is performed by a broadband light source 10 for generating white light, an optical modulator 11 for modulating the white light from the broadband light source 10, and an optical demultiplexer for demultiplexing the modulated light into two wavelength components. (WDM) 12, a delay device 8 for delaying the demultiplexed optical signal of one wavelength component, a delayed optical signal and the demultiplexed optical signal of the other wavelength component, and a combined signal A light combiner 2 for inputting light to the device under test 4,
An optical receiver 5 for converting an optical signal output from the device under test 4 into an electric signal, and a delay time of the optical signal when the device under test 4 is inserted between the optical combiner 2 and the optical receiver 5. Chromatic dispersion is obtained by obtaining the delay time difference between the reference wavelength and the measurement wavelength from the difference between the delay time of the optical signal when the device under test 4 is not inserted between the optical combiner 2 and the optical receiver 5. The network analyzer 6 is required.
【００３６】光変調器１１として用いられるＬｉＮｂＯ
3光変調器は、入力偏波依存性があるため偏波調整が必
要となる。しかし図２に示した波長分散測定装置は無偏
光の白色光を変調するため、入力偏波調整を省略するこ
とができる。また測定波長の偏光は、波長分波器の出力
ポートを選択することにより容易に対応できる。LiNbO used as the optical modulator 11
3 The optical modulator requires polarization adjustment because it has input polarization dependence. However, since the wavelength dispersion measuring apparatus shown in FIG. 2 modulates unpolarized white light, input polarization adjustment can be omitted. The polarization of the measurement wavelength can be easily dealt with by selecting the output port of the wavelength demultiplexer.
【００３７】以上において本発明によれば、遅延時間差
が数ｐｓと非常に小さい遅延時間の場合でも、被測定デ
バイスの波長分散を高精度に測定することができる。そ
のため、光交換機等の高精度な波長分散補償が必要なシ
ステムにおいては、その補償誤差を最小限に抑えること
ができる。In the above, according to the present invention, the delay time difference
Even if the delay time is as small as several ps, the chromatic dispersion of the device under measurement can be measured with high accuracy. Therefore, in a system such as an optical switch that requires highly accurate chromatic dispersion compensation, the compensation error can be minimized.
【００３８】[0038]
【発明の効果】以上要するに本発明によれば、次のよう
な優れた効果を発揮する。In summary, according to the present invention, the following excellent effects are exhibited.
【００３９】二つの波長の光信号を同時に被測定デバイ
スへ入力し、遅延器により基準波長の光信号の変調光と
測定波長の光信号の変調光との間に一定の遅延時間を与
えた後、光合成器により合成して二つの光信号を同時に
被測定デバイスへ入力する。この二つの波長間の遅延時
間差を求めることにより、高精度に波長分散を求めるこ
とができる波長分散測定方法及び波長分散測定装置の提
供を実現することができる。Optical signals of two wavelengths are input to the device under test at the same time, and the optical signals of the reference wavelength are modulated by the delay device.
A fixed delay time is applied between the measured wavelength and the modulated light of the optical signal.
After that, the two optical signals are combined at the same time by the optical combiner.
Input to the device under test. When the delay between these two wavelengths
It is possible to obtain chromatic dispersion with high accuracy by obtaining the difference.
It is possible to realize the provision of a chromatic dispersion measuring method and a chromatic dispersion measuring apparatus capable of achieving the above.
【図１】本発明の波長分散測定方法を適用した波長分散
測定装置の一実施の形態を示す概念図である。FIG. 1 is a conceptual diagram showing an embodiment of a chromatic dispersion measuring apparatus to which a chromatic dispersion measuring method of the present invention is applied.
【図２】本発明の波長分散測定方法を適用した波長分散
測定装置の他の実施の形態を示す概念図である。 FIG. 2 is a chromatic dispersion to which the chromatic dispersion measuring method of the present invention is applied.
It is a conceptual diagram which shows other embodiment of a measuring device.
【図３】従来の波長分散測定方法を適用した波長分散測
定装置の概念図である。 [Fig. 3] Chromatic dispersion measurement using the conventional chromatic dispersion measurement method.
It is a conceptual diagram of a stationary device.
１ａ、１ｂ 光源 ２ 光合成器 ４ 被測定デバイス ５ 光受信器 ６ ネットワークアナライザ７ａ、７ｂ、１２、１４ 光変調器 ８ 遅延器 ９ ２分配器 １０ 広帯域光源 １１ 光変調器 １２ 光分波器（ＷＤＭ） 1a, 1b Light source 2 Optical combiner 4 Device under test 5 Optical receiver 6 Network analyzer 7a, 7b, 12, 14 Optical modulator 8 Delay device 9 2 Distributor 10 Broadband light source 11 Optical modulator 12 Optical demultiplexer (WDM)
Claims (4)
おいて、基準波長の光信号と測定波長の光信号とを同一
の電気信号により変調し、遅延器により基準波長の光信
号の変調光と測定波長の光信号の変調光との間に一定の
遅延時間を与えた後、光合成器により合成して被測定デ
バイスへ入力する系を準備し、ネットワークアナライザ
によりその系に被測定デバイスを挿入した時にその系か
ら出力される光信号の遅延時間とその系に被測定デバイ
スを挿入しない時にその系から出力される光信号の遅延
時間との差から基準波長と測定波長との間の遅延時間差
を求めることにより波長分散を求めることを特徴とする
波長分散測定方法。1. A method for measuring chromatic dispersion of an optical device, wherein an optical signal of a reference wavelength and an optical signal of a measurement wavelength are modulated by the same electric signal, and an optical signal of the reference wavelength is obtained by a delay device.
Between the modulated light of the optical signal and the modulated light of the optical signal of the measurement wavelength.
After giving a delay time, combine with an optical combiner and measure
Prepare a system for input to the device and use a network analyzer
When the device under test is inserted into the system,
Delay time of the optical signal output from the
Delay of the optical signal output from the system when the optical fiber is not inserted
Wavelength dispersion measurement method characterized by determining the chromatic dispersion by obtaining the delay time difference between the time differences between the reference wavelength and the measuring wavelength.
おいて、広帯域白色光源からの白色光を光変調器により
変調し、光分波器により変調光の中から二つの波長成分
に分波し、分波された一方の波長成分の光信号を遅延器
により遅延させ、遅延した光信号と分波された他方の波
長成分の光信号とを光合成器により合成し、合成した信
号光を被測定デバイスへ入力する系を準備し、ネットワ
ークアナライザによりその系に被測定デバイスを挿入し
た時にその系から出力される光信号の遅延時間とその系
に被測定デバイスを挿入しない時にその系から出力され
る光信号の遅延時間との差から基準波長と測定波長との
間の遅延時間差を求めることにより波長分散を求めるこ
とを特徴とする波長分散測定方法。2. A method for measuring chromatic dispersion of an optical device, wherein white light from a broadband white light source is modulated by an optical modulator.
Two wavelength components are modulated and modulated by the optical demultiplexer.
The optical signal of one of the wavelength components
The delayed optical signal is delayed by the
The optical signal of the long component is combined with the optical combiner, and the combined signal
Prepare a system for inputting the optical signal to the device under test, and when the device under test is inserted into the system by the network analyzer , the delay time of the optical signal output from the system and the time when the device under test is not inserted in the system A chromatic dispersion measuring method characterized in that chromatic dispersion is obtained by obtaining a delay time difference between a reference wavelength and a measurement wavelength from a difference with a delay time of an optical signal output from a system.
おいて、基準波長の光信号を発生する光源と、測定波長
の光信号を発生する光源と、両光源からの光信号を同一
の電気信号によりそれぞれ変調する変調器と、基準波長
の光信号の変調光に一定の遅延時間を与える遅延器と、
遅延器からの変調光と測定波長の光信号の変調光とを合
成し被測定デバイスへ入力する光合成器と、光合成器に
接続された被測定デバイスから出力される光信号を電気
信号に変換する光受信器と、被測定デバイスが光合成器
と光受信器との間に挿入された時の光信号の遅延時間と
被測定デバイスが光合成器と光受信器との間に挿入され
ていない時の光信号の遅延時間との差から基準波長と測
定波長との間の遅延時間差を求めることにより波長分散
を求めるネットワークアナライザとを備えたことを特徴
とする波長分散測定装置。 3. An apparatus for measuring chromatic dispersion of an optical device, comprising a light source for generating an optical signal of a reference wavelength, and a measurement wavelength.
The same light signal from both light sources that generates the optical signal of
Modulator that modulates with each electric signal and reference wavelength
A delay device that gives a constant delay time to the modulated light of the optical signal of
Combine the modulated light from the delay device with the modulated light of the optical signal of the measurement wavelength.
To the photosynthesizer and the input to the device under test.
The optical signal output from the connected device under test is converted into an electrical signal.
The optical receiver that converts the signal and the device under test are the optical combiners
And the delay time of the optical signal when it is inserted between the optical receiver and
The device under test is inserted between the optical combiner and the optical receiver.
The reference wavelength is measured from the difference with the delay time of the optical signal when
Chromatic dispersion can be obtained by obtaining the delay time difference from the constant wavelength.
It is equipped with a network analyzer that seeks
Wavelength dispersion measuring device.
おいて、白色光を発生する広帯域白色光源と、該白色光
を変調する光変調器と、変調された白色光の中から二つ
の波長成分に分波する光分波器と、分波された一方の波
長成分の光信号を遅延させる遅延器と、遅延した光信号
と分波された他方の波長成分の光信号とを合成する光合
成器と、光合成器に接続された被測定デバイスから出力
される光信号を電気信号に変換する光受信器と、被測定
デバイスが光合成器と光受信器との間に挿入された時の
光信号の遅延時間と被測定デバイスが光合成器と光受信
器との間に挿入されていない時の光信号の遅延時間との
差から基準波長と測定波長との間の遅延時間差を求める
ことにより波長分散を求めるネットワークアナライザと
を備えたことを特徴とする波長分散測定装置。4. A broadband white light source for generating white light in an apparatus for measuring wavelength dispersion of an optical device, and the white light.
Light modulator that modulates light and two of the modulated white light
Optical demultiplexer that demultiplexes into one wavelength component and one of the demultiplexed waves
A delay device that delays the optical signal of the long component and the delayed optical signal
And an optical signal that combines the demultiplexed optical signal of the other wavelength component.
Output from the device and the device under test connected to the photosynthesizer
Optical receiver that converts the received optical signal into an electrical signal, and the device under test
When the device is inserted between the photosynthesizer and the optical receiver
Optical signal delay time and device under test are optical combiner and optical receiver
With the delay time of the optical signal when not inserted between the
A chromatic dispersion measuring apparatus comprising: a network analyzer that obtains chromatic dispersion by obtaining a delay time difference between a reference wavelength and a measurement wavelength from the difference .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11313498A JP3384322B2 (en) | 1998-04-23 | 1998-04-23 | Chromatic dispersion measuring method and chromatic dispersion measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11313498A JP3384322B2 (en) | 1998-04-23 | 1998-04-23 | Chromatic dispersion measuring method and chromatic dispersion measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11304656A JPH11304656A (en) | 1999-11-05 |
| JP3384322B2 true JP3384322B2 (en) | 2003-03-10 |
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ID=14604421
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|---|---|---|---|
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|---|---|---|---|---|
| JP4493808B2 (en) * | 2000-07-10 | 2010-06-30 | 株式会社アドバンテスト | Optical characteristic measuring apparatus, method, and recording medium |
| AU2001281363A1 (en) * | 2000-08-01 | 2002-02-13 | Wavecrest Corporation | Electromagnetic and optical analyzer |
| WO2002011321A2 (en) * | 2000-08-01 | 2002-02-07 | Wavecrest Corporation | Multichannel system analyzer |
| CN113381815B (en) * | 2021-04-27 | 2022-09-02 | 中国人民解放军空军预警学院 | Dispersion-induced radio frequency power attenuation compensation method and system in optical fiber |
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1998
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