JP5835807B2 - Optical device frequency measurement device - Google Patents

Optical device frequency measurement device Download PDF

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JP5835807B2
JP5835807B2 JP2012150709A JP2012150709A JP5835807B2 JP 5835807 B2 JP5835807 B2 JP 5835807B2 JP 2012150709 A JP2012150709 A JP 2012150709A JP 2012150709 A JP2012150709 A JP 2012150709A JP 5835807 B2 JP5835807 B2 JP 5835807B2
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JP2014013191A (en
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伊藤　敏夫
敏夫 伊藤
福島　誠治
誠治 福島
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Kagoshima University NUC
Nippon Telegraph and Telephone Corp
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本発明は、通信、オーディオ、計測、記録、照明などの分野で用いられる光デバイスの周波数測定装置に関する。   The present invention relates to an optical device frequency measurement apparatus used in the fields of communication, audio, measurement, recording, illumination, and the like.

光送信器、光受信器、光伝送媒体などの光デバイスの周波数特性は、一般に光コンポーネント・アナライザを用いて計測されている（例えば特許文献１）。   The frequency characteristics of optical devices such as optical transmitters, optical receivers, and optical transmission media are generally measured using an optical component analyzer (for example, Patent Document 1).

図１に光コンポーネント・アナライザの典型的な従来の例を示す。図１の光コンポーネント・アナライザは、スイーパ１０１、光送信器１０２、伝送媒体１０３、光受信器１０４、検出器１０５、およびディスプレイ１０６から構成される。   FIG. 1 shows a typical conventional example of an optical component analyzer. The optical component analyzer of FIG. 1 includes a sweeper 101, an optical transmitter 102, a transmission medium 103, an optical receiver 104, a detector 105, and a display 106.

スイーパ１０１は可変周波数の発振器（シンセサイザ）であり、測定範囲の最低周波数から最高周波数までの間を周波数掃引する。光デバイスの周波数特性測定にあっては、光送信器、伝送媒体、光受信器のいずれかが、測定対象（被測定デバイス）となる。図１では、特に測定対象を定めていないが、以下の説明では光受信器１０４を測定対象とする。   The sweeper 101 is a variable frequency oscillator (synthesizer) and sweeps the frequency between the lowest frequency and the highest frequency in the measurement range. In measuring the frequency characteristics of an optical device, one of an optical transmitter, a transmission medium, and an optical receiver is a measurement target (device under measurement). In FIG. 1, the measurement target is not particularly defined, but in the following description, the optical receiver 104 is the measurement target.

スイーパ１０１から出射された高周波信号は、光送信器１０２において光搬送波上にサブキャリア多重化される。光送信器１０２から出射された光は、伝送媒体１０３を経て、光受信器１０４に入射する。測定対象である光受信器１０４で伝送された光は光電変換され、次段の検出器１０５にて振幅成分と位相成分が計測される。検出器１０５にもスイーパ１０１の信号は入力され、検出器のリファレンスとして使用される。検出器１０５で測定された振幅と位相は、横軸が周波数であるスペクトルとしてディスプレイ１０６に表示される。   The high-frequency signal emitted from the sweeper 101 is subcarrier multiplexed on the optical carrier in the optical transmitter 102. The light emitted from the optical transmitter 102 enters the optical receiver 104 through the transmission medium 103. The light transmitted by the optical receiver 104 as the measurement target is photoelectrically converted, and the amplitude component and the phase component are measured by the detector 105 at the next stage. The signal from the sweeper 101 is also input to the detector 105 and used as a reference for the detector. The amplitude and phase measured by the detector 105 are displayed on the display 106 as a spectrum whose horizontal axis is frequency.

米国特許第５０４１９９７号明細書US Pat. No. 5,041,1997

従来の光コンポーネント・アナライザは測定器としての完成度は非常に高い。しかしながら、すべての部品が測定対象の最低周波数から最高周波数の全域において、良好な特性を有していなければならないため、測定器は非常に高価である。   Conventional optical component analyzers are very complete as measuring instruments. However, the measuring instrument is very expensive because all parts must have good characteristics over the entire range from the lowest frequency to the highest frequency to be measured.

上記目的を達成するために、本発明の第１の態様は、光デバイスの周波数特性測定装置であって、基準発振器と、基準発振器と同期して発振する第１および第２の周波数コム発生器と、第１の周波数コム発生器からの出力信号が入力される、被測定光デバイスと、被測定光デバイスの出力信号及び第２の周波数コム発生器の出力信号を入力し、その差周波成分を出力する周波数変換器と、周波数変換器の出力から所望の周波数成分のみを取り出す可変バンドパスフィルタと、可変バンドパスフィルタの出力を検波する検出器と、検出器の出力信号を表示し、記録する出力装置とを備えたことを特徴とする。 To achieve the above object, according to a first aspect of the present invention , there is provided an optical device frequency characteristic measuring apparatus comprising a reference oscillator and first and second frequency comb generators that oscillate in synchronization with the reference oscillator. When the output signal from the first frequency comb generator is input, the measured light device, the output signal of the output signal and a second frequency comb generator of the measured optical device, the difference frequency A frequency converter that outputs the component, a variable bandpass filter that extracts only a desired frequency component from the output of the frequency converter, a detector that detects the output of the variable bandpass filter, and an output signal of the detector, characterized by comprising an output device for recording.

また、本発明の第２の態様は、光デバイスの周波数特性測定装置であって、基準発振器と、基準発振器と同期して発振する第１および第２の周波数コム発生器と、第１の周波数コム発生器からの出力信号が入力され、被測定光デバイスと、被測定光デバイスの出力信号及び第２の周波数コム発生器の出力信号を入力し、その差周波成分を出力する周波数変換器と、周波数変換器の出力をスペクトルとして表示するスペクトラム・アナライザとを備えたことを特徴とする。 According to a second aspect of the present invention , there is provided a frequency characteristic measuring apparatus for an optical device, comprising a reference oscillator, first and second frequency comb generators that oscillate in synchronization with the reference oscillator, and a first frequency. is input the output signal from the comb generator, and inputs and measured light device, the output signal of the output signal and a second frequency comb generator of the measured optical device, frequency converter and outputting the difference frequency component When, characterized in that a spectrum analyzer to display the output of the frequency converter as a spectrum.

また、本発明の第３の態様は、第１または第２に記載の光デバイスの周波数特性測定装置であって、第１の周波数コム発生器と、被測定光デバイスとの間に接続された、光送信器をさらに備えることを特徴とする。 The third aspect of the present invention, there is provided a frequency characteristic measuring apparatus for an optical device according to the first or second, the first frequency comb generator, coupled between the measured light device And an optical transmitter .

また、本発明の第４の態様は、第１または第２に記載の光デバイスの周波数特性測定装置であって、被測定光デバイスと、周波数変換器の間に接続された、光受信器をさらに備えることを特徴とする。 The fourth aspect of the present invention, there is provided a frequency characteristic measuring apparatus for an optical device according to the first or second, and the measured optical device, which is connected between the frequency converter, an optical receiver It is further provided with the feature.

本発明によれば、従来例の中で高コスト要因となっているスイーパを周波数コム発生器に置き換えるため、測定器全体を非常に低コスト化できる。   According to the present invention, since the sweeper, which is a high cost factor in the conventional example, is replaced with a frequency comb generator, the entire measuring instrument can be greatly reduced in cost.

本周波数測定装置は、光通信で使用される光デバイス、光モジュール、光トランシーバの研究開発・検査の現場での測定環境として使用しうる。比較的周波数が低い、オーディオ用光ファイバリンク、赤外線リモコン、可視光光通信の機器類の検査においても、低コストでありながら、十分な機能を発揮する。   This frequency measurement apparatus can be used as a measurement environment in the field of R & D and inspection of optical devices, optical modules, and optical transceivers used in optical communications. Even in the inspection of the optical fiber link for audio, the infrared remote controller, and the visible light optical communication device, which are relatively low in frequency, it exhibits a sufficient function at a low cost.

従来の周波数測定装置の構成を示す図である。It is a figure which shows the structure of the conventional frequency measurement apparatus. 本発明の周波数測定装置の原理を示す図である。It is a figure which shows the principle of the frequency measurement apparatus of this invention. 本発明の実施例１にかかる周波数測定装置の構成を示す図である。It is a figure which shows the structure of the frequency measurement apparatus concerning Example 1 of this invention. 本発明の実施例２にかかる周波数測定装置の構成を示す図である。It is a figure which shows the structure of the frequency measurement apparatus concerning Example 2 of this invention.

［実施例１］
図２を用いて、本発明の実施例１を説明する。図２は、本発明の実施例１にかかる周波数測定装置の構成を示す図である。図２の周波数測定装置は、基準発信機１ａ、周波数コム発生器２ａ、２ｂ、光送信器３ａ、伝送媒体４ａ、光受信機５ａ、周波数変換器６ａ、可変バンドパスフィルタ７、検出器８から構成される。基準発信器は例えば１０ＭＨｚの高精度発信器であり、周波数コム２ａ、２ｂを同期して動かすために使用される。光送信器３ａ、伝送媒体４ａ、光受信器５ａのいずれかが被測定デバイスとなるが、実施例１では、光送信器３ａを被測定デバイスとし、光送信器３ａとして直接変調レーザダイオードを用いた。伝送媒体４ａは、光送信器３ａと光受信器５ａを接続することだけを目的とし、２ｍ長のシングルモード光ファイバを用いた。光受信器５ａは、ＰＩＮ−ＰＤとプリアンプから構成され１０ＧＨｚ帯域の光受信器である。 [Example 1]
A first embodiment of the present invention will be described with reference to FIG. FIG. 2 is a diagram illustrating the configuration of the frequency measurement device according to the first embodiment of the present invention. 2 includes a reference transmitter 1a, frequency comb generators 2a and 2b, an optical transmitter 3a, a transmission medium 4a, an optical receiver 5a, a frequency converter 6a, a variable bandpass filter 7, and a detector 8. Composed. The reference oscillator is, for example, a high-precision oscillator of 10 MHz, and is used to move the frequency combs 2a and 2b in synchronization. Any one of the optical transmitter 3a, the transmission medium 4a, and the optical receiver 5a is a device to be measured. In the first embodiment, the optical transmitter 3a is a device to be measured, and a directly modulated laser diode is used as the optical transmitter 3a. It was. The transmission medium 4a was a single-mode optical fiber having a length of 2 m for the purpose of only connecting the optical transmitter 3a and the optical receiver 5a. The optical receiver 5a is a 10 GHz band optical receiver including a PIN-PD and a preamplifier.

ここで、図３を参照し、本発明の原理を説明する。図３(ａ)、(ｂ)はそれぞれ周波数コム発生器２ａ、２ｂの出力スペクトル、図３(ｃ)は本発明の周波数測定装置の被測定デバイスと周波数変換器を示す図、図３(ｄ)は本発明で周波数が圧縮される様子を描いた図、図３(ｅ)は本発明における測定結果例である。図３(ａ)、(ｂ)に示されるように、周波数コム発生器２ａ、２ｂはそれぞれｆｋ＝ｋ・Δｆ、ｇｋ＝ｋ・Δｇ（ｋは整数、ｆｋ、ｇｋは周波数、Δｆ、Δｇは周波数間隔であり、Δｆ、Δｇは互いに近接している）の多数の周波数成分の高周波信号を出力する。周波数コム発生器としては、例えばパルス発生器などを利用することができる。本発明では、これらの周波数コムが干渉して差周波成分を検出すれば、測定結果の周波数成分がダウン・コンバートされることを利用する。 Now, the principle of the present invention will be described with reference to FIG. 3 (a) and 3 (b) are output spectra of the frequency comb generators 2a and 2b, respectively, FIG. 3 (c) is a diagram showing a device under test and a frequency converter of the frequency measuring apparatus of the present invention, and FIG. ) Is a diagram illustrating how the frequency is compressed according to the present invention, and FIG. 3E is an example of a measurement result according to the present invention. As shown in FIGS. 3 (a) and 3 (b), the frequency comb generators 2a and 2b have f k = k · Δf and g k = k · Δg (k is an integer, f k and g k are frequencies, Δf and Δg are frequency intervals, and Δf and Δg are close to each other). As the frequency comb generator, for example, a pulse generator can be used. In the present invention, if these frequency combs interfere and detect a difference frequency component, the fact that the frequency component of the measurement result is down-converted is used.

図３(ｃ)に周波数測定装置の被測定デバイスと周波数変換器をしめす。周波数測定装置の被測定デバイスと周波数変換器は、差周波検出に関わる部分である。周波数コム発生器２ａの信号は被測定デバイスを経由して周波数変換器へと入力される。周波数コム発生器２ｂの信号は直接周波数変換器へと入力される。周波数変換器においては、周波数コムの各成分ごとに和周波成分や差周波成分が生成されるが、本発明では差周波成分にのみ着目する。例えば、ｋ＝１の場合には、ΔfとΔgの周波数成分の差周波成分である周波数Δf−Δgに信号がダウン・コンバートして現れる。出力周波数は元の周波数Δfの(Δf−Δg)／Δf倍であり、出力信号の周波数を元の信号の周波数と比較して大きく低減することができる。図３(ｄ)は本発明で周波数が圧縮される様子を描いたスペクトル図であり、周波数間隔がΔf−Δgの櫛状のスペクトルが得られる。ｆ＝１０．０ＧＨｚ、ｇ＝１０．１ＧＨｚのとき、差周波成分は０．１ＧＨｚであり、元の周波数ｆ＝１０．０ＧＨｚの１／１００倍である。これが本発明のポイントであり、周波数測定装置は、測定周波数の上限の特性をもつ必要はない。   FIG. 3C shows a device under measurement and a frequency converter of the frequency measuring apparatus. The device under measurement and the frequency converter of the frequency measuring device are parts related to the difference frequency detection. The signal of the frequency comb generator 2a is input to the frequency converter via the device under measurement. The signal of the frequency comb generator 2b is directly input to the frequency converter. In the frequency converter, a sum frequency component and a difference frequency component are generated for each component of the frequency comb. In the present invention, however, only the difference frequency component is focused. For example, when k = 1, the signal appears down-converted to a frequency Δf−Δg, which is a difference frequency component between Δf and Δg. The output frequency is (Δf−Δg) / Δf times the original frequency Δf, and the frequency of the output signal can be greatly reduced compared to the frequency of the original signal. FIG. 3D is a spectrum diagram illustrating how the frequency is compressed according to the present invention, and a comb-like spectrum having a frequency interval of Δf−Δg is obtained. When f = 10.0 GHz and g = 10.1 GHz, the difference frequency component is 0.1 GHz, which is 1/100 times the original frequency f = 10.0 GHz. This is the point of the present invention, and the frequency measurement device does not need to have the upper limit characteristic of the measurement frequency.

次に、何らかの周波数特性を有する被測定デバイスを通過した信号は、周波数コム発生器のｆｋのスペクトルではなく、被測定デバイスの周波数特性を反映させたものとなる。これを図示したのは、図３(ｅ)である。図３(ｅ)に示す実際の特性とは、従来の周波数測定装置における、被測定デバイスを通過した信号であり、本発明による表示とは、本発明の周波数測定装置における、被測定デバイスを通過した信号である。図３(ｅ)に示す本発明による表示は、櫛状のスペクトルであり、この櫛状のスペクトルの包括線（図３(ｅ)の破線に相当する）が、図３(ｅ)に示す実際の特性のスペクトルの周波数を(Δf−Δg)／Δf倍にしたスペクトルに相当する。被測定デバイスの周波数特性は上記の関係をもって、低い周波数帯にダウン・コンバートされて出力される。 Next, the signal that has passed through the device under measurement having some frequency characteristic reflects the frequency characteristic of the device under measurement, not the spectrum of f k of the frequency comb generator. This is illustrated in FIG. 3 (e). The actual characteristic shown in FIG. 3 (e) is a signal that has passed through the device under measurement in the conventional frequency measurement apparatus, and the display according to the present invention passes through the device under measurement in the frequency measurement apparatus of the present invention. Signal. The display according to the present invention shown in FIG. 3 (e) is a comb-like spectrum, and the inclusion line (corresponding to the broken line in FIG. 3 (e)) of this comb-like spectrum is actually shown in FIG. 3 (e). This corresponds to a spectrum obtained by multiplying the frequency of the characteristic spectrum by (Δf−Δg) / Δf times. The frequency characteristics of the device under measurement are output after being down-converted to a low frequency band with the above relationship.

図３においては強度が周波数依存しないコム発生器を前提にして説明を行ったが、実在する周波数依存するコム発生器を用いた場合であっても、周波数特性が既知であるデバイスによる較正によって、正しい測定結果を得ることができる。   In FIG. 3, the description has been made on the assumption of a comb generator whose intensity does not depend on frequency. However, even when a real frequency-dependent comb generator is used, calibration by a device having a known frequency characteristic allows Correct measurement results can be obtained.

図２を再び参照する。周波数コム発生器２ａ、２ｂの周波数間隔をそれぞれΔｆ＝５００ＭＨｚ、Δｇ＝５０５ＭＨｚとし、測定の範囲を１〜１０ＧＨｚとする。周波数コム発生器２ａ、２ｂからは、それぞれ５００ＭＨｚ〜１０ＧＨｚ、５０５ＭＨｚ〜１０．１ＧＨｚの信号が同時に出力される。   Reference is again made to FIG. The frequency intervals of the frequency comb generators 2a and 2b are Δf = 500 MHz and Δg = 505 MHz, respectively, and the measurement range is 1 to 10 GHz. The frequency comb generators 2a and 2b simultaneously output signals of 500 MHz to 10 GHz and 505 MHz to 10.1 GHz, respectively.

周波数コム発生器２ａの出力信号は、被測定デバイスである光送信器３ａ、周波数特性に影響を与えない短いシングルモード光ファイバ、較正された光受信器５ａを経て、周波数変換器６ａへと入力される。一方、周波数コム発生器２ｂの出力信号は直接周波数変換器６ａに入力される。   The output signal of the frequency comb generator 2a is input to the frequency converter 6a via the optical transmitter 3a that is a device under test, a short single-mode optical fiber that does not affect the frequency characteristics, and the calibrated optical receiver 5a. Is done. On the other hand, the output signal of the frequency comb generator 2b is directly input to the frequency converter 6a.

可変バンドパスフィルタ7は多数の周波数コムの中からkが同じ値である１対だけを選択的に通過させる通過中心周波数可変で、例えば通過帯域幅３ＭＨｚのフィルタである。本発明の周波数特性装置では同時に複数の周波数コムが出力されるため、可変バンドパスフィルタの通過中心周波数を掃引することで各周波数における出力を計測する。検出器８は、可変バンドパスフィルタ７からの信号から振幅情報と位相情報を検出する。位相情報が不要な場合は、全波整流ダイオードなどの簡単な検出器を使用することができる。   The variable bandpass filter 7 is a filter having a variable pass center frequency that selectively passes only one pair of k having the same value from a number of frequency combs, and has a passband width of 3 MHz, for example. Since the frequency characteristic device of the present invention outputs a plurality of frequency combs simultaneously, the output at each frequency is measured by sweeping the pass center frequency of the variable bandpass filter. The detector 8 detects amplitude information and phase information from the signal from the variable bandpass filter 7. If phase information is not required, a simple detector such as a full wave rectifier diode can be used.

以上の構成で製作した実施例の周波数特性測定装置で、被測定デバイス（光送信器３ａ）の周波数特性を良好に測定することができた。すなわち、図３ｅに示す本発明の表示の櫛状のスペクトルの包括線が、周波数がダウンコンバートされた実際の特性を再現できた。測定範囲は５００ＭＨｚ〜１０ＧＨｚであるが、出力信号は５〜１００ＭＨｚにダウン・コンバートされていて、測定系の低コスト化が実現できた。   With the frequency characteristic measuring apparatus of the example manufactured with the above configuration, the frequency characteristic of the device under measurement (optical transmitter 3a) could be measured satisfactorily. In other words, the comb-shaped spectrum inclusion line of the display of the present invention shown in FIG. 3e could reproduce the actual characteristics with the frequency down-converted. The measurement range is 500 MHz to 10 GHz, but the output signal is down-converted to 5 to 100 MHz, and the cost of the measurement system can be reduced.

実施例１の装置においては、測定された周波数間隔が５００ＭＨｚであるため、例えば５００ＭＨｚと１ＧＨｚの間の性能を測定することができない。そこで、基準発振器の発信周波数を掃引することによって、５００ＭＨｚと１ＧＨｚの間（すなわち、全測定周波数範囲）の測定も実施することができた。   In the apparatus of the first embodiment, since the measured frequency interval is 500 MHz, for example, performance between 500 MHz and 1 GHz cannot be measured. Therefore, by sweeping the oscillation frequency of the reference oscillator, measurement between 500 MHz and 1 GHz (that is, the entire measurement frequency range) could be performed.

［実施例２］
図４を用いて、本発明の実施例２を説明する。図４は、本発明の実施例２にかかる周波数測定装置の構成を示す図である。図４の周波数測定装置は、基準発振器１ｂ、周波数コム発生器２ｃ、２ｄ、光送信器３ｂ、伝送媒体４ｂ、光受信器５ｂ、周波数変換器６ｂ、スペクトラム・アナライザ９から構成される。本実施例と実施例１との相違点は、実施例１の周波数測定装置は可変バンドパスフィルタおよび検出器を含むが、実施例２では代わりにスペクトラム・アナライザ９を含む点である。この点に注目して説明を行う。 [Example 2]
A second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a diagram illustrating the configuration of the frequency measurement device according to the second embodiment of the present invention. 4 includes a reference oscillator 1b, frequency comb generators 2c and 2d, an optical transmitter 3b, a transmission medium 4b, an optical receiver 5b, a frequency converter 6b, and a spectrum analyzer 9. The difference between the present embodiment and the first embodiment is that the frequency measurement device of the first embodiment includes a variable bandpass filter and a detector, but the second embodiment includes a spectrum analyzer 9 instead. The description will be given with this point in mind.

実施例１では周波数全域の出力が一斉に得られるため、測定・表示のためにバンドパスフィルタを用いた。実施例２では、ただちに振幅や位相のスペクトルが得られるようにスペクトラム・アナライザ９を用いた。これにより、簡単に被測定デバイスの周波数特性を得た。実施例２も良好な周波数特性測定装置として機能した。   In Example 1, since the output of the whole frequency range is obtained all at once, a band pass filter was used for measurement and display. In the second embodiment, the spectrum analyzer 9 is used so that amplitude and phase spectra can be obtained immediately. As a result, the frequency characteristics of the device under measurement were easily obtained. Example 2 also functioned as a good frequency characteristic measuring apparatus.

［実施例３］
実施例３の構成は実施例１あるいは２と同様である。伝送媒体は分散の影響が出ない程度の長さの光ファイバとするが、光受信器は被測定デバイス、光送信器はモノリシック集積レーザ・電界効果型光変調器とする。モノリシック集積レーザ・電界吸収型光変調器のうち、レーザダイオードは自動パワー制御モードにおいて、ほぼ一定の電流値で駆動する。被測定対象でない光送受信器の周波数特性は低周波から高周波まで平坦であり、電圧入力・透過率出力特性（以下、入出力特性）は低歪であることが望まれる。よって、電界吸収型光変調器は入出力特性の変曲点に電圧バイアスし、かつ小振幅で動作させた。 [Example 3]
The configuration of the third embodiment is the same as that of the first or second embodiment. The transmission medium is an optical fiber having a length that does not affect the dispersion, but the optical receiver is a device under test and the optical transmitter is a monolithic integrated laser / field-effect optical modulator. Of the monolithic integrated laser / electro-absorption optical modulator, the laser diode is driven with a substantially constant current value in the automatic power control mode. It is desired that the frequency characteristics of an optical transceiver not to be measured are flat from a low frequency to a high frequency, and the voltage input / transmittance output characteristics (hereinafter referred to as input / output characteristics) are low distortion. Therefore, the electroabsorption optical modulator was operated with a small amplitude by voltage biasing at the inflection point of the input / output characteristics.

実施例３の他の部分の構造、動作は実施例１あるいは２と同様であるため、説明を省略する。実施例３の周波数特性測定装置においては、周波数特性の広さ・平坦性及び入出力特性の低歪性が非常に有効に機能した結果として、広いダイナミックレンジ範囲において光受信器の周波数特性を測定することができた。   Since the structure and operation of other parts of the third embodiment are the same as those of the first or second embodiment, description thereof is omitted. In the frequency characteristic measuring apparatus according to the third embodiment, the frequency characteristic of the optical receiver is measured in a wide dynamic range as a result of the wide and flatness of the frequency characteristic and the low distortion of the input / output characteristic functioning very effectively. We were able to.

以上、実施例１から３にて述べたように、本発明の光デバイスの周波数特性装置を用いれば従来の例と比較して、構成要素の多くの部品が測定の最高周波数までの特性を有していなくとも、測定が可能である。低コストにて光デバイスの周波数特性測定装置を製作することができた。   As described above in Embodiments 1 to 3, when the optical device frequency characteristic apparatus of the present invention is used, many components of the component have characteristics up to the maximum frequency of measurement compared to the conventional example. Even if it is not, measurement is possible. A device for measuring frequency characteristics of optical devices could be manufactured at low cost.

１０１ スイーパ
１０２、３ａ、３ｂ 光送信器
１０３、４ａ、４ｂ 伝送媒体
１０４、５ａ、５ｂ 光受信器
１０５、８ 検出器
１０６ ディスプレイ
１ａ、１ｂ 基準発信器
２ａ、２ｂ、２ｃ、２ｄ 周波数コム発生器
６ａ、６ｂ 周波数変換器
７ 可変バンドパスフィルタ
９ スペクトラム・アナライザ 101 Sweeper 102, 3a, 3b Optical transmitter 103, 4a, 4b Transmission medium 104, 5a, 5b Optical receiver 105, 8 Detector 106 Display 1a, 1b Reference transmitter 2a, 2b, 2c, 2d Frequency comb generator 6a 6b Frequency converter 7 Variable bandpass filter 9 Spectrum analyzer

Claims (6)

基準発振器と、
前記基準発振器と同期して発振する第１および第２の周波数コム発生器と、
前記第１の周波数コム発生器からの出力信号が入力される、被測定光デバイスと、
前記被測定光デバイスの出力信号及び前記第２の周波数コム発生器の出力信号を入力し、その差周波成分を出力する周波数変換器と、
前記周波数変換器の出力から所望の周波数成分のみを取り出す可変バンドパスフィルタと、
前記可変バンドパスフィルタの出力を検波する検出器と、
前記検出器の出力信号を表示し、記録する出力装置と
を備えたことを特徴とする光デバイスの周波数特性測定装置。 A reference oscillator;
First and second frequency comb generators that oscillate in synchronization with the reference oscillator;
The output signal from the first frequency comb generator is input, the measured light devices,
A frequency converter for inputting an output signal of the device under test and an output signal of the second frequency comb generator, and outputting a difference frequency component thereof;
A variable bandpass filter that extracts only a desired frequency component from the output of the frequency converter;
A detector for detecting the output of the variable bandpass filter;
An output device for displaying and recording the output signal of the detector;
An apparatus for measuring frequency characteristics of an optical device, comprising: 基準発振器と、
前記基準発振器と同期して発振する第１および第２の周波数コム発生器と、
前記第１の周波数コム発生器からの出力信号が入力される、被測定光デバイスと、
前記被測定光デバイスの出力信号及び前記第２の周波数コム発生器の出力信号を入力し、その差周波成分を出力する周波数変換器と、
前記周波数変換器の出力をスペクトルとして表示するスペクトラム・アナライザと
を備えたことを特徴とする光デバイスの周波数特性測定装置。 A reference oscillator;
First and second frequency comb generators that oscillate in synchronization with the reference oscillator;
The output signal from the first frequency comb generator is input, the measured light devices,
A frequency converter for inputting an output signal of the device under test and an output signal of the second frequency comb generator, and outputting a difference frequency component thereof;
A spectrum analyzer for displaying the output of the frequency converter as a spectrum;
An apparatus for measuring frequency characteristics of an optical device, comprising: 前記第１の周波数コム発生器と、前記被測定光デバイスとの間に接続された、光送信器をさらに備える請求項１または２に記載の光デバイスの周波数特性測定装置。  3. The optical device frequency characteristic measuring apparatus according to claim 1, further comprising an optical transmitter connected between the first frequency comb generator and the optical device to be measured. 前記被測定光デバイスと、前記周波数変換器の間に接続された、光受信器をさらに備える請求項１または２に記載の光デバイスの周波数特性測定装置。  The frequency characteristic measuring apparatus of the optical device according to claim 1, further comprising an optical receiver connected between the optical device to be measured and the frequency converter. 前記光送信器は、モノリシック集積レーザ・電界吸収型光変調器であることを特徴とする請求項３に記載の光デバイスの周波数特性測定装置。 4. The frequency characteristic measuring apparatus for an optical device according to claim 3 , wherein the optical transmitter is a monolithic integrated laser / electro-absorption optical modulator. 前記光送信器は、印加電圧対透過率特性において変曲点に電圧バイアスされたモノリシック集積レーザ・電界吸収型光変調器であることを特徴とする請求項３に記載の光デバイスの周波数特性測定装置。 4. The frequency characteristic measurement of an optical device according to claim 3 , wherein the optical transmitter is a monolithic integrated laser / electro-absorption optical modulator that is voltage-biased at an inflection point in applied voltage versus transmittance characteristics. apparatus.
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