JP2022158309A - Optical signal waveform measuring device and optical signal waveform measuring method - Google Patents

Optical signal waveform measuring device and optical signal waveform measuring method Download PDF

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JP2022158309A
JP2022158309A JP2021063094A JP2021063094A JP2022158309A JP 2022158309 A JP2022158309 A JP 2022158309A JP 2021063094 A JP2021063094 A JP 2021063094A JP 2021063094 A JP2021063094 A JP 2021063094A JP 2022158309 A JP2022158309 A JP 2022158309A
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真樹 上野
Masaki Ueno
崇 村上
Takashi Murakami
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Anritsu Corp
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Abstract

To automatically adjust the attenuation amount of an optical signal outputted from an optical signal waveform measurement object to an appropriate attenuation amount without the need for a user to prepare a variable attenuation device in addition to an optical signal waveform measuring device, even when the electric power of an optical signal outputted from an optical signal waveform measurement object is difference (when especially large) for each optical signal waveform measurement object.SOLUTION: An optical signal waveform measuring device 2 comprises, inside of a housing of a local device: an attenuation amount adjustment unit 26 for adjusting the attenuation amount of an optical signal inputted to the local device so that the electric power of the optical signal outputted from a variable attenuation device 22 equals prescribed electric power; and a waveform measurement unit 24 for measuring the waveform of the electric signal outputted from a signal conversion unit 23 when the electric power of the optical signal outputted from the variable attenuation device 22 equals the prescribed electric power.SELECTED DRAWING: Figure 1

Description

本開示は、光信号を電気信号に変換し、光信号の波形を測定する技術に関する。 The present disclosure relates to technology for converting an optical signal into an electrical signal and measuring the waveform of the optical signal.

光信号を電気信号に変換し、光信号の波形を測定する技術が、特許文献１等に開示されている。特許文献１では、測定波長毎に信号変換部を選択している。 A technique for converting an optical signal into an electrical signal and measuring the waveform of the optical signal is disclosed in Japanese Unexamined Patent Application Publication No. 2002-200013 and the like. In Patent Document 1, a signal converter is selected for each measurement wavelength.

特開２０１８－１２４２３７号公報JP 2018-124237 A

ところで、光信号波形測定対象から出力された光信号の電力は、光信号波形測定対象毎に異なることがある。すると、光信号波形測定対象から出力された光信号の電力が大きいときには、光信号を電気信号に変換する信号変換部で電気信号歪みが生じることがある。そして、光信号波形測定対象から出力された光信号の電力がさらに大きいときには、信号変換部が損傷する原因となる。 By the way, the power of the optical signal output from the optical signal waveform measurement target may differ for each optical signal waveform measurement target. Then, when the power of the optical signal output from the optical signal waveform measurement target is high, electrical signal distortion may occur in the signal converter that converts the optical signal into an electrical signal. Further, when the power of the optical signal output from the optical signal waveform measurement target is even higher, it may cause damage to the signal converter.

そこで、光信号波形測定対象から出力された光信号の電力が大きいときには、ユーザが光信号波形測定装置に加え、可変減衰装置を用意する必要がある。そして、可変減衰装置から出力された光信号の電力が、信号変換部に入力されるべき範囲の光信号の電力と等しくなるように、ユーザが光信号波形測定対象から出力された光信号の減衰量を調整する必要がある。よって、測定開始前に減衰量調整する手間が生じるという問題があった。 Therefore, when the power of the optical signal output from the optical signal waveform measurement target is high, the user needs to prepare a variable attenuation device in addition to the optical signal waveform measurement device. Then, the user attenuates the optical signal output from the optical signal waveform measurement object so that the power of the optical signal output from the variable attenuation device becomes equal to the power of the optical signal in the range to be input to the signal conversion unit. I need to adjust the amount. Therefore, there is a problem that it takes time to adjust the attenuation amount before starting the measurement.

そこで、前記課題を解決するために、本開示は、光信号波形測定対象から出力された光信号の電力が、光信号波形測定対象毎に異なるとき（特に大きいとき）であっても、ユーザが光信号波形測定装置に加え、可変減衰装置を用意することなく、自動的に光信号波形測定対象から出力された光信号の減衰量を適切な減衰量に調整することを目的とする。 Therefore, in order to solve the above problems, the present disclosure provides a method for enabling a user to An object of the present invention is to automatically adjust the attenuation of an optical signal output from an optical signal waveform measurement object to an appropriate attenuation without preparing a variable attenuation device in addition to an optical signal waveform measurement device.

前記課題を解決するために、請求項１に係る発明は、光信号の波形を測定する光信号波形測定装置であって、自装置に入力された光信号の減衰量を可変可能な可変減衰部と、前記可変減衰部から出力された光信号を電気信号に変換する信号変換部と、前記信号変換部から出力された電気信号の電力と、前記信号変換部の変換効率と、に基づいて、前記可変減衰部から出力された光信号の電力を監視する電力監視部と、前記可変減衰部から出力された光信号の電力が所定の電力と等しくなるように、前記自装置に入力された光信号の減衰量を調整する減衰量調整部と、前記可変減衰部から出力された光信号の電力が前記所定の電力と等しくなったときに、前記信号変換部から出力された電気信号の波形を測定する波形測定部と、を前記自装置の筐体内に備えることを特徴とする光信号波形測定装置である。 In order to solve the above-mentioned problems, the invention according to claim 1 is an optical signal waveform measuring device for measuring the waveform of an optical signal, comprising a variable attenuation section capable of varying the attenuation of the optical signal input to the device. and a signal converter that converts the optical signal output from the variable attenuator into an electrical signal, the power of the electrical signal output from the signal converter, and the conversion efficiency of the signal converter, a power monitoring unit for monitoring the power of the optical signal output from the variable attenuator; an attenuation adjuster for adjusting the attenuation of a signal; and a waveform of the electrical signal output from the signal converter when the power of the optical signal output from the variable attenuator becomes equal to the predetermined power. and a waveform measuring unit for measuring the optical signal waveform, which is provided in a housing of the apparatus itself.

請求項１に係る発明において、請求項２に係る発明は、前記減衰量調整部は、（１）前記自装置の測定の初期段階では、前記自装置に入力された光信号の減衰量を所定の減衰量に設定し、（２）前記可変減衰部から出力された光信号の電力が前記所定の電力と比べて大きいときには、前記自装置に入力された光信号の減衰量を前記所定の減衰量と比べて大きい減衰量に調整し、（３）前記可変減衰部から出力された光信号の電力が前記所定の電力と比べて小さいときには、前記自装置に入力された光信号の減衰量を前記所定の減衰量と比べて小さい減衰量に調整することを特徴とする光信号波形測定装置である。 In the invention according to claim 1, the invention according to claim 2 is characterized in that the attenuation amount adjustment unit (1) at an initial stage of the measurement of the own apparatus sets the attenuation amount of the optical signal input to the own apparatus to a predetermined amount. and (2) when the power of the optical signal output from the variable attenuator is greater than the predetermined power, the attenuation of the optical signal input to the self apparatus is set to the predetermined attenuation (3) when the power of the optical signal output from the variable attenuator is smaller than the predetermined power, the attenuation of the optical signal input to the self apparatus is adjusted to The optical signal waveform measuring apparatus is characterized in that the attenuation is adjusted to be smaller than the predetermined attenuation.

請求項１又は２に係る発明において、請求項３に係る発明は、前記波形測定部は、前記可変減衰部から出力された光信号の前記所定の電力と、前記自装置に入力された光信号の調整済みの減衰量と、前記自装置の入力端子の接続損失と、前記入力端子から前記可変減衰部を経て前記信号変換部までの光ファイバの伝送損失と、に基づいて、前記自装置に入力された光信号の電力を測定することを特徴とする光信号波形測定装置である。 In the invention according to claim 1 or 2, the invention according to claim 3 is characterized in that the waveform measurement unit measures the predetermined power of the optical signal output from the variable attenuator and the optical signal input to the device itself. and the connection loss of the input terminal of the device itself, and the transmission loss of the optical fiber from the input terminal through the variable attenuation unit to the signal conversion unit. An optical signal waveform measuring device characterized by measuring the power of an input optical signal.

前記課題を解決するために、請求項４に係る発明は、光信号の波形を測定する光信号波形測定装置を用いる光信号波形測定方法であって、自装置に入力された光信号の減衰量を可変可能な可変減衰手順と、前記可変減衰手順で出力された光信号を電気信号に変換する信号変換手順と、前記信号変換手順で出力された電気信号の電力と、前記信号変換手順の変換効率と、に基づいて、前記可変減衰手順で出力された光信号の電力を監視する電力監視手順と、前記可変減衰手順で出力された光信号の電力が所定の電力と等しくなるように、前記自装置に入力された光信号の減衰量を調整する減衰量調整手順と、前記可変減衰手順で出力された光信号の電力が前記所定の電力と等しくなったときに、前記信号変換手順で出力された電気信号の波形を測定する波形測定手順と、を前記自装置の筐体内で行うことを特徴とする光信号波形測定方法である。 In order to solve the above-mentioned problems, the invention according to claim 4 is an optical signal waveform measuring method using an optical signal waveform measuring device for measuring the waveform of an optical signal, wherein the attenuation amount of the optical signal input to the device is a signal conversion procedure for converting the optical signal output in the variable attenuation procedure into an electrical signal; the power of the electrical signal output in the signal conversion procedure; a power monitoring procedure for monitoring the power of the optical signal output by the variable attenuation procedure based on the efficiency, and the power of the optical signal output by the variable attenuation procedure is equal to a predetermined power; an attenuation adjustment procedure for adjusting the attenuation of the optical signal input to the device; and output by the signal conversion procedure when the power of the optical signal output by the variable attenuation procedure becomes equal to the predetermined power. and a waveform measurement procedure for measuring the waveform of the generated electrical signal.

請求項４に係る発明において、請求項５に係る発明は、前記減衰量調整手順は、（１）前記自装置の測定の初期段階では、前記自装置に入力された光信号の減衰量を所定の減衰量に設定し、（２）前記可変減衰手順で出力された光信号の電力が前記所定の電力と比べて大きいときには、前記自装置に入力された光信号の減衰量を前記所定の減衰量と比べて大きい減衰量に調整し、（３）前記可変減衰手順で出力された光信号の電力が前記所定の電力と比べて小さいときには、前記自装置に入力された光信号の減衰量を前記所定の減衰量と比べて小さい減衰量に調整することを特徴とする光信号波形測定方法である。 In the invention according to claim 4, the invention according to claim 5 is characterized in that the attenuation amount adjustment procedure includes: (1) in an initial stage of measurement of the own apparatus, the attenuation amount of the optical signal input to the own apparatus is set to a predetermined amount; and (2) when the power of the optical signal output by the variable attenuation procedure is greater than the predetermined power, the attenuation of the optical signal input to the self apparatus is set to the predetermined attenuation. (3) when the power of the optical signal output by the variable attenuation procedure is smaller than the predetermined power, the attenuation of the optical signal input to the self apparatus is adjusted to The optical signal waveform measuring method is characterized in that the attenuation is adjusted to be smaller than the predetermined attenuation.

請求項４又は５に係る発明において、請求項６に係る発明は、前記波形測定手順は、前記可変減衰手順で出力された光信号の前記所定の電力と、前記自装置に入力された光信号の調整済みの減衰量と、前記自装置の入力端子の接続損失と、前記入力端子から前記可変減衰手順を経て前記信号変換手順までの光ファイバの伝送損失と、に基づいて、前記自装置に入力された光信号の電力を測定することを特徴とする光信号波形測定方法である。 In the invention according to claim 4 or 5, the invention according to claim 6 is characterized in that, in the waveform measurement step, the predetermined power of the optical signal output in the variable attenuation step and the optical signal input to the device are , the connection loss of the input terminal of the device itself, and the transmission loss of the optical fiber from the input terminal to the signal conversion procedure through the variable attenuation procedure, An optical signal waveform measuring method characterized by measuring the power of an input optical signal.

このように、本開示は、光信号波形測定対象から出力された光信号の電力が、光信号波形測定対象毎に異なるとき（特に大きいとき）であっても、ユーザが光信号波形測定装置に加え、可変減衰装置を用意することなく、自動的に光信号波形測定対象から出力された光信号の減衰量を適切な減衰量に調整することができる。 In this way, the present disclosure enables the user to use the optical signal waveform measurement apparatus even when the power of the optical signal output from the optical signal waveform measurement target differs (especially when it is large) for each optical signal waveform measurement target. In addition, it is possible to automatically adjust the attenuation of the optical signal output from the optical signal waveform measurement target to an appropriate attenuation without preparing a variable attenuation device.

本開示の光信号波形測定装置の構成を示す図である。1 is a diagram showing a configuration of an optical signal waveform measuring device of the present disclosure; FIG. 本開示の光信号波形測定方法の手順を示す図である。It is a figure which shows the procedure of the optical-signal-waveform-measurement method of this disclosure. 本開示の大電力の入力光信号に対する処理を示す図である。FIG. 4 illustrates processing for high power input optical signals of the present disclosure; 本開示の小電力の入力光信号に対する処理を示す図である。FIG. 4 illustrates the processing for a low power input optical signal of the present disclosure; 本開示の減衰量制御及び補正表示のテーブルを示す図である。FIG. 4 is a diagram showing a table of attenuation amount control and correction display according to the present disclosure;

添付の図面を参照して本開示の実施形態を説明する。以下に説明する実施形態は本開示の実施の例であり、本開示は以下の実施形態に制限されるものではない。 Embodiments of the present disclosure will be described with reference to the accompanying drawings. The embodiments described below are examples of implementing the present disclosure, and the present disclosure is not limited to the following embodiments.

本開示の光信号波形測定装置の構成を図１に示す。本開示の光信号波形測定方法の手順を図２に示す。光信号波形測定装置２は、入力端子２１、可変減衰部２２、信号変換部２３、波形測定部２４、電力監視部２５及び減衰量調整部２６を、自装置の筐体内に備える。 FIG. 1 shows the configuration of the optical signal waveform measuring device of the present disclosure. FIG. 2 shows the procedure of the optical signal waveform measuring method of the present disclosure. The optical signal waveform measurement device 2 includes an input terminal 21, a variable attenuation section 22, a signal conversion section 23, a waveform measurement section 24, a power monitoring section 25, and an attenuation amount adjustment section 26 within its housing.

光信号波形測定対象１は、例えばＤＵＴ（Ｄｅｖｉｃｅ Ｕｎｄｅｒ Ｔｅｓｔ）等である。光信号波形測定装置２は、例えば光サンプリングオシロスコープ等である。光信号波形測定対象１と光信号波形測定装置２とは、接続端子１１及び入力端子２１を介して接続される。 The optical signal waveform measurement target 1 is, for example, a DUT (Device Under Test). The optical signal waveform measuring device 2 is, for example, an optical sampling oscilloscope. The optical signal waveform measurement object 1 and the optical signal waveform measurement device 2 are connected via a connection terminal 11 and an input terminal 21 .

可変減衰部２２は、例えばＶＯＡ（Ｖａｒｉａｂｌｅ Ｏｐｔｉｃａｌ Ａｔｔｅｎｕａｔｏｒ）等であり、例えば電圧信号等を可変減衰量の制御信号として入力している。信号変換部２３は、例えばＰＤ（Ｐｈｏｔｏ Ｄｉｏｄｅ）等であり、光信号を電気信号に変換する変換効率が入力光電力で所定の特性を有している。 The variable attenuation unit 22 is, for example, a VOA (Variable Optical Attenuator) or the like, and receives, for example, a voltage signal or the like as a variable attenuation control signal. The signal conversion unit 23 is, for example, a PD (Photo Diode) or the like, and has a predetermined characteristic of conversion efficiency for converting an optical signal into an electric signal depending on the input optical power.

光信号波形測定対象１から出力された光信号の電力は、光信号波形測定対象１毎に異なることがある（大きいことがあり、小さいこともある。）。そこで、本開示の大電力（例えば＋数ｄＢｍ以上）の入力光信号に対する処理を図３に示す。そして、本開示の小電力（例えば－１０数ｄＢｍ以下）の入力光信号に対する処理を図４に示す。さらに、本開示の減衰量制御及び補正表示のテーブルを図５に示す。 The power of the optical signal output from the optical signal waveform measurement object 1 may differ (may be large or small) for each optical signal waveform measurement object 1 . Therefore, FIG. 3 shows processing for an input optical signal of high power (for example, +several dBm or more) according to the present disclosure. FIG. 4 shows processing for an input optical signal of low power (for example, −10 dBm or less) according to the present disclosure. Further, FIG. 5 shows a table of attenuation amount control and correction display of the present disclosure.

図３の左欄、中欄及び右欄では、それぞれ、大電力の入力光信号に対する処理のうちの、測定の初期段階、減衰量の制御段階及び結果の表示段階を示す。 The left, middle, and right columns of FIG. 3 respectively show the initial measurement stage, the attenuation control stage, and the result display stage of the processing for the high-power input optical signal.

測定の初期段階として、減衰量調整部２６は、光信号波形測定装置２の測定の初期段階では、光信号波形測定装置２に入力された光信号（大電力ＰＩＨ）の減衰量を所定の減衰量ＡＩに設定する（ステップＳ１）。ここで、所定の減衰量ＡＩは、光信号波形測定対象１から出力された光信号の電力のレンジが考慮されたうえで、光信号を電気信号に変換する信号変換部２３で電気信号歪みが小さくなる減衰量（減衰後に、例えば＋数ｄＢｍ以下）に設定され、電気信号ＳＮ比が良くなる（例えばシングルモードファイバ（ＳＭＦ）であれば、ＳＮ比が所望の値、例えば１５～１６ｄＢ以上）減衰量に設定される。或いは、所定の減衰量ＡＩは、光信号波形測定対象１から出力された光信号の電力のレンジが考慮されたうえで、ユーザの指定の減衰量に設定されてもよい。 At the initial stage of measurement, the attenuation adjustment unit 26 adjusts the attenuation of the optical signal (high power P IH ) input to the optical signal waveform measurement device 2 to a predetermined value. The attenuation amount is set to AI (step S1). Here, the predetermined amount of attenuation AI is determined by taking into consideration the power range of the optical signal output from the optical signal waveform measurement target 1, and the electrical signal distortion in the signal converter 23 that converts the optical signal into an electrical signal. is set to a small attenuation amount (for example, + several dBm or less after attenuation), and the electrical signal SN ratio is improved (for example, in the case of single mode fiber (SMF), the SN ratio is set to a desired value, for example, 15 to 16 dB or more ) attenuation. Alternatively, the predetermined amount of attenuation AI may be set to an amount of attenuation specified by the user after considering the power range of the optical signal output from the optical signal waveform measurement target 1 .

可変減衰部２２は、光信号波形測定装置２に入力された光信号（大電力ＰＩＨ）の減衰量を可変可能である（ステップＳ２）。信号変換部２３は、可変減衰部２２から出力された光信号（電力ＰＡＨ）を電気信号に変換する（ステップＳ３）。電力監視部２５は、信号変換部２３から出力された電気信号の電力と、信号変換部２３の変換効率と、に基づいて、可変減衰部２２から出力された光信号の電力ＰＡＨを監視する（ステップＳ４）。 The variable attenuation unit 22 can vary the amount of attenuation of the optical signal (high power P IH ) input to the optical signal waveform measuring device 2 (step S2). The signal converter 23 converts the optical signal (power P AH ) output from the variable attenuator 22 into an electrical signal (step S3). The power monitoring unit 25 monitors the power PAH of the optical signal output from the variable attenuation unit 22 based on the power of the electrical signal output from the signal conversion unit 23 and the conversion efficiency of the signal conversion unit 23. (Step S4).

光信号波形測定装置２に入力された光信号の大電力ＰＩＨは、所定の減衰量ＡＩと、入力端子２１の接続損失ＬＩと、入力端子２１から可変減衰部２２を経て信号変換部２３までの光ファイバの伝送損失ＬОと、を受けて、可変減衰部２２から出力された光信号の電力ＰＡＨ＝ＰＩＨ－（ＡＩ＋ＬＩ＋ＬО）（単位はｄＢｍ）に減衰される。 The high power P IH of the optical signal input to the optical signal waveform measuring device 2 is divided into a predetermined attenuation A I , a connection loss L I of the input terminal 21, and a signal conversion section from the input terminal 21 via the variable attenuation section 22. In response to the transmission loss L O of the optical fiber up to 23, the power of the optical signal output from the variable attenuator 22 is attenuated to P AH =P IH -(A I + LI +L O ) (unit: dBm). be.

減衰量の制御段階として、減衰量調整部２６は、可変減衰部２２から出力された光信号の電力が所定の電力ＰＡＦと等しくなるように、光信号波形測定装置２に入力された光信号（大電力ＰＩＨ）の減衰量を調整する。ここで、所定の電力ＰＡＦは、信号変換部２３の入力光電力の適切な範囲が考慮されたうえで、光信号を電気信号に変換する信号変換部２３で電気信号歪みが小さくなる電力（減衰後に、例えば＋数ｄＢｍ以下）にまで減衰され、電気信号ＳＮ比が良くなる（例えばシングルモードファイバ（ＳＭＦ）であれば、ＳＮ比が所望の値、例えば１５～１６ｄＢ以上）電力にまで減衰される。 As an attenuation amount control step, the attenuation amount adjustment unit 26 adjusts the optical signal input to the optical signal waveform measurement apparatus 2 so that the power of the optical signal output from the variable attenuation unit 22 is equal to the predetermined power PAF . Adjust the attenuation of (high power P IH ). Here, the predetermined power P AF is determined by taking into consideration the appropriate range of the input optical power of the signal converter 23, and the power ( After attenuation, for example, it is attenuated to + several dBm or less), and the electrical signal SN ratio is improved (for example, if it is a single mode fiber (SMF), the SN ratio is a desired value, for example, 15 to 16 dB or more). be done.

具体的には、減衰量調整部２６は、可変減衰部２２から出力された光信号の電力ＰＡＨが所定の電力ＰＡＦと比べて大きいため（ステップＳ５で「出力＞所定」）、光信号波形測定装置２に入力された光信号（大電力ＰＩＨ）の減衰量を、所定の減衰量ＡＩと比べて大きい減衰量ＡＦＨに調整する（ステップＳ６）。そして、ステップＳ２～Ｓ４が再実行される。 Specifically, since the power PAH of the optical signal output from the variable attenuator 22 is greater than the predetermined power PAF ("output>predetermined" in step S5), the attenuation amount adjuster 26 adjusts the optical signal The attenuation of the optical signal (high power P IH ) input to the waveform measuring device 2 is adjusted to an attenuation A FH that is greater than the predetermined attenuation A I (step S6). Steps S2 to S4 are then re-executed.

光信号波形測定装置２に入力された光信号の大電力ＰＩＨは、大きい減衰量ＡＦＨと、入力端子２１の接続損失ＬＩと、入力端子２１から可変減衰部２２を経て信号変換部２３までの光ファイバの伝送損失ＬОと、を受けて、可変減衰部２２から出力された光信号の電力ＰＡＦ＝ＰＩＨ－（ＡＦＨ＋ＬＩ＋ＬО）（単位はｄＢｍ）に減衰される。 The high power P IH of the optical signal input to the optical signal waveform measuring device 2 is divided into a large attenuation A FH , a connection loss L I at the input terminal 21, and a signal conversion section 23 from the input terminal 21 via the variable attenuation section 22. The optical signal output from the variable attenuator 22 is attenuated to power P AF = P IH - (A FH + L I + L O ) (unit: dBm) . .

結果の表示段階として、波形測定部２４は、可変減衰部２２から出力された光信号の電力ＰＡＦが所定の電力ＰＡＦと等しくなったため（ステップＳ５で「出力＝所定」）、信号変換部２３から出力された電気信号の電力を受ける（ステップＳ８）。そして、波形測定部２４は、信号変換部２３から出力された電気信号の電力に信号変換部２３の変換効率を適用して、光信号波形測定装置２に入力された光信号の電力を測定し、電力を例えば縦軸として、時間を例えば横軸として、波形を表示する（具体的には、ステップＳ９）。 At the stage of displaying the result, the waveform measurement unit 24 determines that the power PAF of the optical signal output from the variable attenuator 22 is equal to the predetermined power PAF ("output=predetermined" in step S5), so that the signal conversion unit 23 receives the power of the electric signal output from 23 (step S8). Then, the waveform measurement unit 24 applies the conversion efficiency of the signal conversion unit 23 to the power of the electrical signal output from the signal conversion unit 23 to measure the power of the optical signal input to the optical signal waveform measurement device 2. , the waveform is displayed with, for example, power as the vertical axis and time as the horizontal axis (specifically, step S9).

つまり、波形測定部２４は、可変減衰部２２から出力された光信号の所定の電力ＰＡＦと、光信号波形測定装置２に入力された光信号の調整済みの減衰量ＡＦＨと、入力端子２１の接続損失ＬＩと、入力端子２１から可変減衰部２２を経て信号変換部２３までの光ファイバの伝送損失ＬОと、に基づいて、光信号波形測定装置２に入力された光信号の大電力ＰＩＨ＝ＰＡＦ＋（ＡＦＨ＋ＬＩ＋ＬО）（単位はｄＢｍ）を測定・表示する（ステップＳ９）。 That is, the waveform measurement unit 24 measures the predetermined power P AF of the optical signal output from the variable attenuation unit 22, the adjusted attenuation A FH of the optical signal input to the optical signal waveform measurement device 2, and the input terminal 21 and the transmission loss L O of the optical fiber from the input terminal 21 to the signal converter 23 via the variable attenuator 22, the optical signal input to the optical signal waveform measuring device 2 is determined. The high power P IH =P AF +(A FH + LI +L O ) (unit: dBm) is measured and displayed (step S9).

なお、減衰量調整部２６は、図５に示した減衰量制御のテーブルを参照したうえで、可変減衰部２２から出力された光信号の電力ＰＡＨに基づいて、所定の減衰量ＡＩと比べて大きい減衰量ＡＦＨ＝ＡＩ＋（ＰＡＨ－ＰＡＦ）（単位はｄＢｍ）を調整してもよい。また、波形測定部２４は、図５に示した補正表示のテーブルを参照したうえで、可変減衰部２２から出力された光信号の電力ＰＡＨに基づいて、光信号波形測定装置２に入力された光信号の大電力ＰＩＨ＝ＰＡＦ＋（ＡＦＨ＋ＬＩ＋ＬО）（単位はｄＢｍ）を測定・表示してもよい。 The attenuation adjustment unit 26 refers to the attenuation control table shown in FIG. A relatively large attenuation amount A FH =A I +(P AH -P AF ) (in dBm) may be adjusted. Further, the waveform measurement unit 24 refers to the correction display table shown in FIG. The large power P IH =P AF +(A FH + LI +L O ) (unit: dBm) of the optical signal obtained may be measured and displayed.

図４の左欄、中欄及び右欄では、それぞれ、小電力の入力光信号に対する処理のうちの、測定の初期段階、減衰量の制御段階及び結果の表示段階を示す。 The left, middle and right columns of FIG. 4 respectively show the initial measurement stage, the attenuation control stage and the result display stage of the processing for the low-power input optical signal.

測定の初期段階として、減衰量調整部２６は、光信号波形測定装置２の測定の初期段階では、光信号波形測定装置２に入力された光信号（小電力ＰＩＬ）の減衰量を所定の減衰量ＡＩに設定する（ステップＳ１）。ここで、所定の減衰量ＡＩは、光信号波形測定対象１から出力された光信号の電力のレンジが考慮されたうえで、電気信号ＳＮ比が良くなる（例えばシングルモードファイバ（ＳＭＦ）であれば、ＳＮ比が所望の値、例えば１５～１６ｄＢ以上）減衰量に設定され、光信号を電気信号に変換する信号変換部２３で電気信号歪みが小さくなる減衰量（減衰後に、例えば＋数ｄＢｍ以下）に設定される。或いは、所定の減衰量ＡＩは、光信号波形測定対象１から出力された光信号の電力のレンジが考慮されたうえで、ユーザの指定の減衰量に設定されてもよい。 At the initial stage of measurement, the attenuation adjustment unit 26 adjusts the attenuation of the optical signal (low power P IL ) input to the optical signal waveform measurement device 2 to a predetermined value in the initial stage of measurement by the optical signal waveform measurement device 2 . The attenuation amount is set to AI (step S1). Here, the predetermined amount of attenuation AI is determined in consideration of the power range of the optical signal output from the optical signal waveform measurement target 1, and the electric signal SN ratio is improved (for example, in single mode fiber (SMF)). If there is, the signal-to-noise ratio is set to a desired value, for example, 15 to 16 dB or more), and the signal conversion unit 23 that converts the optical signal into an electrical signal reduces the electrical signal distortion. dBm or less). Alternatively, the predetermined amount of attenuation AI may be set to an amount of attenuation specified by the user after considering the power range of the optical signal output from the optical signal waveform measurement target 1 .

可変減衰部２２は、光信号波形測定装置２に入力された光信号（小電力ＰＩＬ）の減衰量を可変可能である（ステップＳ２）。信号変換部２３は、可変減衰部２２から出力された光信号（電力ＰＡＬ）を電気信号に変換する（ステップＳ３）。電力監視部２５は、信号変換部２３から出力された電気信号の電力と、信号変換部２３の変換効率と、に基づいて、可変減衰部２２から出力された光信号の電力ＰＡＬを監視する（ステップＳ４）。 The variable attenuation unit 22 can vary the amount of attenuation of the optical signal (low power P IL ) input to the optical signal waveform measuring device 2 (step S2). The signal converter 23 converts the optical signal (power P AL ) output from the variable attenuator 22 into an electrical signal (step S3). The power monitoring unit 25 monitors the power PAL of the optical signal output from the variable attenuation unit 22 based on the power of the electrical signal output from the signal conversion unit 23 and the conversion efficiency of the signal conversion unit 23. (Step S4).

光信号波形測定装置２に入力された光信号の小電力ＰＩＬは、所定の減衰量ＡＩと、入力端子２１の接続損失ＬＩと、入力端子２１から可変減衰部２２を経て信号変換部２３までの光ファイバの伝送損失ＬОと、を受けて、可変減衰部２２から出力された光信号の電力ＰＡＬ＝ＰＩＬ－（ＡＩ＋ＬＩ＋ＬО）（単位はｄＢｍ）に減衰される。 The small power PIL of the optical signal input to the optical signal waveform measuring device 2 is divided into a predetermined attenuation amount AI , a connection loss LI at the input terminal 21, and a signal conversion section from the input terminal 21 via the variable attenuation section 22. In response to the transmission loss L O of the optical fiber up to 23, the power P AL of the optical signal output from the variable attenuator 22 is attenuated to P AL = P IL - (A I + L I + L O ) (unit: dBm). be.

減衰量の制御段階として、減衰量調整部２６は、可変減衰部２２から出力された光信号の電力が所定の電力ＰＡＦと等しくなるように、光信号波形測定装置２に入力された光信号（小電力ＰＩＬ）の減衰量を調整する。ここで、所定の電力ＰＡＦは、信号変換部２３の入力光電力の適切な範囲が考慮されたうえで、電気信号ＳＮ比が良くなる（例えばシングルモードファイバ（ＳＭＦ）であれば、ＳＮ比が所望の値、例えば１５～１６ｄＢ以上）電力にまで減衰され、光信号を電気信号に変換する信号変換部２３で電気信号歪みが小さくなる電力（減衰後に、例えば＋数ｄＢｍ以下）にまで減衰される。 As an attenuation amount control step, the attenuation amount adjustment unit 26 adjusts the optical signal input to the optical signal waveform measurement apparatus 2 so that the power of the optical signal output from the variable attenuation unit 22 is equal to the predetermined power PAF . Adjust the attenuation of (small power P IL ). Here, the predetermined power PAF is determined by taking into consideration the appropriate range of the input optical power of the signal converter 23, and the electric signal SN ratio is improved (for example, if a single mode fiber (SMF) is used, the SN ratio is attenuated to a desired value, for example, 15 to 16 dB or more), and the electric signal distortion is reduced in the signal conversion unit 23 that converts the optical signal into an electric signal (after attenuation, for example, + several dBm or less). be done.

具体的には、減衰量調整部２６は、可変減衰部２２から出力された光信号の電力ＰＡＬが所定の電力ＰＡＦと比べて小さいため（ステップＳ５で「出力＜所定」）、光信号波形測定装置２に入力された光信号（小電力ＰＩＬ）の減衰量を、所定の減衰量ＡＩと比べて小さい減衰量ＡＦＬに調整する（ステップＳ７）。そして、ステップＳ２～Ｓ４が再実行される。 Specifically, since the power PAL of the optical signal output from the variable attenuator 22 is smaller than the predetermined power PAF ( "output<predetermined" in step S5), the attenuation adjuster 26 adjusts the optical signal The attenuation of the optical signal (low power P IL ) input to the waveform measuring device 2 is adjusted to an attenuation A FL that is smaller than the predetermined attenuation A I (step S7). Steps S2 to S4 are then re-executed.

光信号波形測定装置２に入力された光信号の小電力ＰＩＬは、小さい減衰量ＡＦＬと、入力端子２１の接続損失ＬＩと、入力端子２１から可変減衰部２２を経て信号変換部２３までの光ファイバの伝送損失ＬОと、を受けて、可変減衰部２２から出力された光信号の電力ＰＡＦ＝ＰＩＬ－（ＡＦＬ＋ＬＩ＋ＬО）（単位はｄＢｍ）に減衰される。 The low power PIL of the optical signal input to the optical signal waveform measuring device 2 is composed of a small attenuation amount AFL , a connection loss LI of the input terminal 21, and a signal conversion section 23 from the input terminal 21 via the variable attenuation section 22. The power of the optical signal output from the variable attenuator 22 is attenuated to P AF = P IL - (A FL + L I + L O ) (unit: dBm) . .

結果の表示段階として、波形測定部２４は、可変減衰部２２から出力された光信号の電力ＰＡＦが所定の電力ＰＡＦと等しくなったため（ステップＳ５で「出力＝所定」）、信号変換部２３から出力された電気信号の電力を受ける（ステップＳ８）。そして、波形測定部２４は、信号変換部２３から出力された電気信号の電力に信号変換部２３の変換効率を適用して、光信号波形測定装置２に入力された光信号の電力を測定し、電力を例えば縦軸として、時間を例えば横軸として、波形を表示する（具体的には、ステップＳ９）。 At the stage of displaying the result, the waveform measurement unit 24 determines that the power PAF of the optical signal output from the variable attenuator 22 is equal to the predetermined power PAF ("output=predetermined" in step S5), so that the signal conversion unit 23 receives the power of the electric signal output from 23 (step S8). Then, the waveform measurement unit 24 applies the conversion efficiency of the signal conversion unit 23 to the power of the electrical signal output from the signal conversion unit 23 to measure the power of the optical signal input to the optical signal waveform measurement device 2. , the waveform is displayed with, for example, power as the vertical axis and time as the horizontal axis (specifically, step S9).

つまり、波形測定部２４は、可変減衰部２２から出力された光信号の所定の電力ＰＡＦと、光信号波形測定装置２に入力された光信号の調整済みの減衰量ＡＦＬと、入力端子２１の接続損失ＬＩと、入力端子２１から可変減衰部２２を経て信号変換部２３までの光ファイバの伝送損失ＬОと、に基づいて、光信号波形測定装置２に入力された光信号の小電力ＰＩＬ＝ＰＡＦ＋（ＡＦＬ＋ＬＩ＋ＬО）（単位はｄＢｍ）を測定・表示する（ステップＳ９）。 That is, the waveform measurement unit 24 measures the predetermined power P AF of the optical signal output from the variable attenuation unit 22, the adjusted attenuation amount A FL of the optical signal input to the optical signal waveform measurement device 2, and the input terminal 21 and the transmission loss L O of the optical fiber from the input terminal 21 to the signal converter 23 via the variable attenuator 22, the optical signal input to the optical signal waveform measuring device 2 is determined. The small power PIL = PAF +( AFL + LI +LO) (unit: dBm) is measured and displayed (step S9).

なお、減衰量調整部２６は、図５に示した減衰量制御のテーブルを参照したうえで、可変減衰部２２から出力された光信号の電力ＰＡＬに基づいて、所定の減衰量ＡＩと比べて小さい減衰量ＡＦＬ＝ＡＩ－（ＰＡＦ－ＰＡＬ）（単位はｄＢｍ）を調整してもよい。また、波形測定部２４は、図５に示した補正表示のテーブルを参照したうえで、可変減衰部２２から出力された光信号の電力ＰＡＬに基づいて、光信号波形測定装置２に入力された光信号の小電力ＰＩＬ＝ＰＡＦ＋（ＡＦＬ＋ＬＩ＋ＬО）（単位はｄＢｍ）を測定・表示してもよい。 The attenuation adjustment unit 26 refers to the attenuation control table shown in FIG. A relatively small attenuation amount A FL =A I -(P AF -P AL ) (in dBm) may be adjusted. Further, the waveform measurement unit 24 refers to the correction display table shown in FIG. The small power P IL =P AF +(A FL + LI +L O ) (unit: dBm) of the optical signal obtained may be measured and displayed.

以上に説明したように、光信号波形測定対象１から出力された光信号の電力が、光信号波形測定対象１毎に異なるとき（大きい／小さいとき、特に大きいとき）であっても、ユーザが光信号波形測定装置２に加え、可変減衰装置を用意することなく、自動的に光信号波形測定対象１から出力された光信号の減衰量を適切な減衰量に調整することができる。 As described above, even when the power of the optical signal output from the optical signal waveform measurement object 1 differs (large/small, particularly large) for each optical signal waveform measurement object 1, the user The attenuation of the optical signal output from the optical signal waveform measurement object 1 can be automatically adjusted to an appropriate attenuation without preparing a variable attenuation device in addition to the optical signal waveform measurement device 2 .

そして、光信号波形測定対象１から出力された光信号の減衰量と、光信号波形測定装置２の筐体内の接続損失及び伝送損失と、を自動的に加味したうえで、可変減衰部２２から出力された光信号の電力を測定・表示するのではなく、光信号波形測定装置２に入力された光信号の電力（ユーザの所望電力）を測定・表示することができる。 Then, after automatically considering the attenuation of the optical signal output from the optical signal waveform measurement target 1 and the connection loss and transmission loss in the housing of the optical signal waveform measurement device 2, the variable attenuation section 22 Instead of measuring and displaying the power of the output optical signal, the power of the optical signal input to the optical signal waveform measuring device 2 (user's desired power) can be measured and displayed.

本開示の光信号波形測定装置及び光信号波形測定方法は、例えば光サンプリングオシロスコープ等に適用することができ、ユーザが光サンプリングオシロスコープ等に加え、可変減衰装置を用意することなく、測定可能な入力光の電力範囲を拡大することができる。 The optical signal waveform measurement device and optical signal waveform measurement method of the present disclosure can be applied to, for example, an optical sampling oscilloscope, etc., and the user can measure inputs without preparing a variable attenuation device in addition to the optical sampling oscilloscope. The power range of light can be expanded.

１：光信号波形測定対象
２：光信号波形測定装置
１１：接続端子
２１：入力端子
２２：可変減衰部
２３：信号変換部
２４：波形測定部
２５：電力監視部
２６：減衰量調整部 1: Optical signal waveform measurement object 2: Optical signal waveform measuring device 11: Connection terminal 21: Input terminal 22: Variable attenuation unit 23: Signal conversion unit 24: Waveform measurement unit 25: Power monitoring unit 26: Attenuation adjustment unit

Claims (6)

光信号の波形を測定する光信号波形測定装置であって、
自装置に入力された光信号の減衰量を可変可能な可変減衰部と、
前記可変減衰部から出力された光信号を電気信号に変換する信号変換部と、
前記信号変換部から出力された電気信号の電力と、前記信号変換部の変換効率と、に基づいて、前記可変減衰部から出力された光信号の電力を監視する電力監視部と、
前記可変減衰部から出力された光信号の電力が所定の電力と等しくなるように、前記自装置に入力された光信号の減衰量を調整する減衰量調整部と、
前記可変減衰部から出力された光信号の電力が前記所定の電力と等しくなったときに、前記信号変換部から出力された電気信号の波形を測定する波形測定部と、
を前記自装置の筐体内に備えることを特徴とする光信号波形測定装置。 An optical signal waveform measuring device for measuring the waveform of an optical signal,
a variable attenuation unit capable of varying the amount of attenuation of an optical signal input to the device;
a signal converter that converts the optical signal output from the variable attenuator into an electrical signal;
a power monitoring unit that monitors the power of the optical signal output from the variable attenuation unit based on the power of the electrical signal output from the signal conversion unit and the conversion efficiency of the signal conversion unit;
an attenuation adjustment unit that adjusts the attenuation of the optical signal input to the device so that the power of the optical signal output from the variable attenuation unit is equal to a predetermined power;
a waveform measuring unit that measures the waveform of the electrical signal output from the signal conversion unit when the power of the optical signal output from the variable attenuation unit becomes equal to the predetermined power;
in a housing of the device itself. 前記減衰量調整部は、（１）前記自装置の測定の初期段階では、前記自装置に入力された光信号の減衰量を所定の減衰量に設定し、（２）前記可変減衰部から出力された光信号の電力が前記所定の電力と比べて大きいときには、前記自装置に入力された光信号の減衰量を前記所定の減衰量と比べて大きい減衰量に調整し、（３）前記可変減衰部から出力された光信号の電力が前記所定の電力と比べて小さいときには、前記自装置に入力された光信号の減衰量を前記所定の減衰量と比べて小さい減衰量に調整する
ことを特徴とする、請求項１に記載の光信号波形測定装置。 The attenuation adjustment unit (1) sets the attenuation of the optical signal input to the device to a predetermined attenuation in the initial stage of measurement of the device, and (2) outputs from the variable attenuation unit (3) the variable When the power of the optical signal output from the attenuation unit is smaller than the predetermined power, the attenuation of the optical signal input to the device is adjusted to be smaller than the predetermined attenuation. 2. The optical signal waveform measuring device according to claim 1. 前記波形測定部は、前記可変減衰部から出力された光信号の前記所定の電力と、前記自装置に入力された光信号の調整済みの減衰量と、前記自装置の入力端子の接続損失と、前記入力端子から前記可変減衰部を経て前記信号変換部までの光ファイバの伝送損失と、に基づいて、前記自装置に入力された光信号の電力を測定する
ことを特徴とする、請求項１又は２に記載の光信号波形測定装置。 The waveform measuring unit measures the predetermined power of the optical signal output from the variable attenuation unit, the adjusted attenuation amount of the optical signal input to the device itself, and the connection loss of the input terminal of the device itself. and a transmission loss of an optical fiber from the input terminal to the signal conversion section through the variable attenuation section, and the power of the optical signal input to the apparatus is measured. 3. The optical signal waveform measuring device according to 1 or 2. 光信号の波形を測定する光信号波形測定装置を用いる光信号波形測定方法であって、
自装置に入力された光信号の減衰量を可変可能な可変減衰手順と、
前記可変減衰手順で出力された光信号を電気信号に変換する信号変換手順と、
前記信号変換手順で出力された電気信号の電力と、前記信号変換手順の変換効率と、に基づいて、前記可変減衰手順で出力された光信号の電力を監視する電力監視手順と、
前記可変減衰手順で出力された光信号の電力が所定の電力と等しくなるように、前記自装置に入力された光信号の減衰量を調整する減衰量調整手順と、
前記可変減衰手順で出力された光信号の電力が前記所定の電力と等しくなったときに、前記信号変換手順で出力された電気信号の波形を測定する波形測定手順と、
を前記自装置の筐体内で行うことを特徴とする光信号波形測定方法。 An optical signal waveform measuring method using an optical signal waveform measuring device for measuring the waveform of an optical signal,
a variable attenuation procedure capable of varying the amount of attenuation of an optical signal input to the device;
a signal conversion procedure for converting the optical signal output by the variable attenuation procedure into an electrical signal;
a power monitoring procedure for monitoring the power of the optical signal output by the variable attenuation procedure based on the power of the electrical signal output by the signal conversion procedure and the conversion efficiency of the signal conversion procedure;
an attenuation adjustment procedure for adjusting the attenuation of the optical signal input to the device so that the power of the optical signal output by the variable attenuation procedure is equal to a predetermined power;
a waveform measurement step of measuring the waveform of the electrical signal output in the signal conversion step when the power of the optical signal output in the variable attenuation step becomes equal to the predetermined power;
is performed within the housing of the device itself. 前記減衰量調整手順は、（１）前記自装置の測定の初期段階では、前記自装置に入力された光信号の減衰量を所定の減衰量に設定し、（２）前記可変減衰手順で出力された光信号の電力が前記所定の電力と比べて大きいときには、前記自装置に入力された光信号の減衰量を前記所定の減衰量と比べて大きい減衰量に調整し、（３）前記可変減衰手順で出力された光信号の電力が前記所定の電力と比べて小さいときには、前記自装置に入力された光信号の減衰量を前記所定の減衰量と比べて小さい減衰量に調整する
ことを特徴とする、請求項４に記載の光信号波形測定方法。 The attenuation amount adjustment procedure includes (1) setting the attenuation amount of the optical signal input to the own apparatus to a predetermined attenuation amount in the initial stage of the measurement of the own apparatus, and (2) outputting by the variable attenuation procedure. (3) the variable When the power of the optical signal output by the attenuation procedure is smaller than the predetermined power, the attenuation of the optical signal input to the device is adjusted to be smaller than the predetermined attenuation. 5. The optical signal waveform measuring method according to claim 4. 前記波形測定手順は、前記可変減衰手順で出力された光信号の前記所定の電力と、前記自装置に入力された光信号の調整済みの減衰量と、前記自装置の入力端子の接続損失と、前記入力端子から前記可変減衰手順を経て前記信号変換手順までの光ファイバの伝送損失と、に基づいて、前記自装置に入力された光信号の電力を測定する
ことを特徴とする、請求項４又は５に記載の光信号波形測定方法。 The waveform measurement procedure includes the predetermined power of the optical signal output by the variable attenuation procedure, the adjusted attenuation of the optical signal input to the device itself, and the connection loss of the input terminal of the device itself. , the transmission loss of the optical fiber from the input terminal through the variable attenuation procedure to the signal conversion procedure, and the power of the optical signal input to the self device is measured based on the above. 6. The optical signal waveform measurement method according to 4 or 5.
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