WO2015190097A1 - 光受信器及び光受信方法 - Google Patents
光受信器及び光受信方法 Download PDFInfo
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- WO2015190097A1 WO2015190097A1 PCT/JP2015/002909 JP2015002909W WO2015190097A1 WO 2015190097 A1 WO2015190097 A1 WO 2015190097A1 JP 2015002909 W JP2015002909 W JP 2015002909W WO 2015190097 A1 WO2015190097 A1 WO 2015190097A1
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- 238000012545 processing Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 6
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- 230000001427 coherent effect Effects 0.000 description 43
- 230000010287 polarization Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 9
- 230000006870 function Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4257—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
Definitions
- the present invention relates to an optical receiver, an optical reception method, and an optical receiver control program, and more particularly to an optical receiver, an optical reception method, and an optical receiver control program used in a coherent optical transmission system.
- a coherent optical receiver is used to demodulate signal light.
- received signal light (received light) and LO (local oscillation) light having substantially the same optical frequency as the received light are combined by an optical mixer called a 90-degree hybrid.
- the 90-degree hybrid output is received by a PD (photodiode).
- the PD outputs a beat signal between the received light and the LO light as a photocurrent to the differential amplifier.
- the differential amplifier converts the photocurrent output from the PD into a voltage signal, and outputs the voltage signal to an ADC (analog-digital converter).
- the beat signal converted into a digital signal by the ADC is output to a DSP (digital signal processor, signal processing circuit).
- the DSP performs arithmetic processing on the digital signal output from the ADC and reproduces the transmitted data.
- Patent Document 1 describes a frequency control system having a function for holding the frequency of LO light at a value immediately before the disconnection of an input signal is detected.
- Patent Document 2 describes an optical receiving circuit having a function for generating an input interruption alarm signal only when an optical input is interrupted.
- Japanese Patent Laid-Open No. 05-308325 paragraph [0013]
- Japanese Patent Application Laid-Open No. 02-105643 page 3, lower right-page 4, lower right
- only the received light of the selected wavelength can be received by the monitor PD by selecting the received light (reception channel) of the wavelength to be received with an optical filter.
- a coherent optical receiver can receive only received light having a wavelength that generates a beat signal with LO light as an electrical signal. For this reason, the coherent optical receiver does not necessarily require an optical filter for selecting a reception channel. However, a coherent optical receiver that does not include an optical filter for selecting a reception channel cannot select the reception light of the reception channel by the optical filter and measure the optical power or detect the LOS.
- the optical power of the reception channel can also be measured based on the amplitude of the electrical signal converted from the signal light of the reception channel.
- the automatic frequency control system described in Patent Document 1 has a configuration for suppressing fluctuations in the frequency of LO light even if a temporary light input interruption occurs. However, Patent Document 1 does not describe a configuration for detecting the optical power of received light.
- the optical receiver circuit described in Patent Document 2 has a configuration that generates an input interruption alarm based on the gain of a variable gain amplifier circuit that amplifies a received signal. However, the configuration of Patent Document 2 cannot accurately detect the optical power of the received signal when the amplifier circuit operates outside the dynamic range. (Object of invention)
- An object of the present invention is to provide an optical receiver, an optical receiving method, and an optical receiver control program capable of accurately detecting the optical power of a received signal without requiring an optical filter in a wide optical input power range. is there.
- the optical receiver of the present invention receives a coherently modulated signal light, outputs a first electric signal converted from the signal light, and amplifies the first electric signal by amplifying the first electric signal.
- Amplifying means for outputting the first electric signal as a second electric signal; optical power of the signal light in the receiving means; gain of the amplifying means; and amplitude of the second electric signal
- control means for obtaining the optical power of the signal light based on the relationship.
- the optical reception method of the present invention receives coherently modulated signal light, outputs a first electric signal converted from the signal light, amplifies the first electric signal, and amplifies the first electric signal
- the electric signal is output as a second electric signal
- the optical power at the time of receiving the signal light, at least one of the gain at the time of amplification of the first electric signal and the amplitude of the second electric signal, The optical power of the signal light is obtained based on the relationship.
- the control program for the optical receiver of the present invention includes a procedure for receiving coherently modulated signal light, a procedure for outputting a first electric signal converted from the signal light, to the computer of the optical receiver, A procedure for amplifying an electrical signal; a procedure for outputting the amplified first electrical signal as a second electrical signal; an optical power upon reception of the signal light; and a gain upon amplification of the first electrical signal; A procedure for determining the optical power of the signal light based on the relationship with at least one of the amplitudes of the second electric signal is executed.
- the optical receiver, the optical receiving method, and the optical receiver control program of the present invention can accurately detect the optical power of the received signal in a wide optical input power range.
- FIG. 1 is a block diagram illustrating a configuration of a coherent optical receiver 100 according to the first embodiment of this invention.
- the coherent optical receiver 100 of the first embodiment includes a PBS (polarization beam splitter) 1, a BS (beam splitter) 2, a 90-degree hybrid 3, an LO (local oscillation) light source. 4 is provided.
- the coherent optical receiver 100 according to the first embodiment further includes a PD (photo diode) 5, a differential amplifier 6, an ADC (analog-digital converter) 7, a DSP (digital signal processor). , A signal processing circuit) 8 and a control circuit 9. Since the basic configuration and operation of the coherent optical receiver 100 are well known, only the outline of the general configuration and operation will be described below.
- the coherent optical receiver 100 receives the wavelength-multiplexed signal light 110.
- the received signal light 110 (received light) is separated into X polarization and Y polarization orthogonal to each other by the PBS 1.
- the separated received lights are respectively input to different 90-degree hybrids 3.
- the LO light output from the LO light source 4 is branched by the BS 2 and input to different 90 degree hybrids 3.
- One 90-degree hybrid 3 is provided for each of the received light corresponding to the X polarization and the received light corresponding to the Y polarization.
- the received light separated into X-polarized light and Y-polarized light by the PBS 1 is combined with LO light having substantially the same optical frequency as the received light in the 90-degree hybrid 3.
- LO light having substantially the same optical frequency as the received light in the 90-degree hybrid 3.
- only signal light having substantially the same wavelength as the LO light among the wavelength-multiplexed received light interferes with the LO light and generates a beat signal.
- By controlling the wavelength of the LO light it is possible to select a signal light having a wavelength (reception channel) desired to be received from the received light and generate a beat signal.
- the beat signal generated by the 90-degree hybrid 3 is received by the PD 5.
- the output of one 90 degree hybrid 3 is equipped with four PD5s. Two of the four PDs 5 output a beat signal having a phase of an I (inphase) component as a differential signal (photocurrent). The other two PDs 5 output beat signals having a Q (quadrature) component phase as differential signals.
- the differential signal output from the PD 5 is input to the differential amplifier 6.
- One differential amplifier 6 is provided for each signal of the X polarization I component (XI), the X polarization Q component (XQ), the Y polarization I component (YI), and the Y polarization Q component (YQ). Provided.
- FIG. 2 is a block diagram showing the configuration of the differential amplifier 6.
- the differential amplifier 6 includes a TIA (trans-impedance amplifier) 61, an AGC (automatic gain control) amplifier 62, a buffer 63, an offset detector 64, and a peak detector 65.
- the photocurrent output from the PD 5 is converted into a voltage signal by the TIA 61 and input to the AGC amplifier 62.
- the peak detector 65 detects the peak value of the amplitude of the signal output from the buffer 63, and controls the gain of the AGC amplifier 62 (AGC control) so that the amplitude of the detected signal is within a certain range.
- the amplitude of the signal output from the buffer 63 (output amplitude) and the gain of the AGC amplifier 62 are input to the control circuit 9.
- the gain of the buffer 63 is 1. That is, the output amplitude of the AGC amplifier 62 and the output amplitude of the buffer 63 are equal.
- the maximum value of the gain of the AGC amplifier 62 is A0. Even when a gain exceeding A0 is required by the AGC control, the gain of the AGC amplifier 62 is set to A0.
- the optical power of the signal light of the reception channel of the coherent optical receiver 100 is estimated based on the gain of the AGC amplifier 62 used for feedback control and the amplitude of the output signal of the buffer 63.
- the differential amplifier 6 converts the photocurrent output from the PD 5 into a voltage signal and outputs it to the ADC 7.
- the received signal converted into a digital signal by the ADC 7 is output to the DSP 8.
- the DSP 8 performs arithmetic processing on the digital signal output from the ADC 7 and reproduces the transmitted data.
- the signal light of the reception channel is attenuated due to optical loss on the PBS 1, 90-degree hybrid 3 and the path connecting them, and then mixed with LO light and converted into a photocurrent by the PD 5.
- the amplitude of the photocurrent output from the PD 5 is the optical power of the signal light of the reception channel and the optical power of the LO light input to the PD 5, and the quantum efficiency of the PD 5 (conversion from signal light to electric signal). It is determined by the coefficient.
- the attenuation amount of PBS1, BS2, and 90 degree hybrid 3 and the quantum efficiency of PD5 are fixed, and any of these can be measured in advance.
- the optical power of the LO light output from the LO light source 4 can be measured in advance or controlled to a desired value.
- the current-voltage conversion characteristic in the TIA 61 can also be regarded as constant.
- the amplitude of the signal input to the AGC amplifier 62 can be known from the output amplitude V of the differential amplifier 6 and the gain A of the AGC amplifier 62. Based on the amplitude of the signal input to the AGC amplifier 62 and the current-voltage conversion characteristic of the TIA 61, the amplitude of the photocurrent output from the PD 5 can be obtained. That is, the relationship between the output amplitude V of the differential amplifier 6 and the gain A of the AGC amplifier 62 and the optical power of the signal light of the reception channel input to the PD 5 can be obtained.
- the relationship between the output amplitude V of the differential amplifier 6 and the gain A of the AGC amplifier 62 and the optical power of the signal light of the reception channel is measured when the coherent optical receiver 100 is manufactured, and the measurement data is transferred to the control circuit 9. It may be memorized. The measurement may be performed under different operating conditions, with the optical and electrical characteristics of the components of the coherent optical receiver 100 such as optical component loss and LO light power as parameters.
- the optical power of the signal light of the reception channel can also be obtained by referring to the measurement data at the time of manufacture based on the output amplitude V of the differential amplifier 6 and the gain A of the AGC amplifier 62.
- the coherent optical receiver 100 can know the optical power of the signal light of the reception channel based on the operating state of the differential amplifier 6 without selecting the reception wavelength by the optical filter.
- FIG. 3 is a diagram illustrating an example of the relationship between the optical input power Pin and the gain A of the AGC amplifier 62 in the present embodiment.
- the optical input power Pin is the optical power when the signal light of the reception channel is input to the coherent optical receiver 100.
- the relationship of FIG. 3 may be calculated based on the electrical characteristics or optical characteristics of the elements constituting the coherent optical receiver 100, or may be measured when the coherent optical receiver 100 is manufactured. Good.
- P0 is the minimum optical input power necessary for obtaining an output signal with a constant amplitude (that is, a set value of output amplitude at the time of AGC control) V0 by AGC control of the AGC amplifier 62.
- the AGC amplifier 62 operates with the maximum gain A0, but the amplitude of the output signal of the AGC amplifier 62 does not reach V0.
- the AGC amplifier 62 operates within the dynamic range.
- FIG. 4 is a diagram showing an example of the relationship between the optical input power Pin and the amplitude V of the output signal of the differential amplifier 6 in the present embodiment.
- the optical input power Pin is the optical power of the reception channel received by the coherent optical receiver 100. Similar to FIG. 3, the relationship of FIG. 4 may be calculated based on the characteristic values of the elements constituting the coherent optical receiver 100 or may be measured when the coherent optical receiver 100 is manufactured.
- the gain A of the AGC amplifier 62 becomes a constant value of the maximum value A0 as shown in FIG. That is, when Pin ⁇ P0, the optical input power P cannot be obtained using FIG. However, when Pin ⁇ P0, the optical input power Pin can be obtained from the relationship between the output amplitude V and the optical input power Pin shown in FIG.
- the optical input power Pin can be obtained from the output amplitude V and gain A of the AGC amplifier 62 during operation.
- the optical input power Pin can be obtained from the relationship between the output amplitude V and FIG.
- the optical input power Pin can be obtained by calculation using the output amplitude V, the gain A0, and the values of the electrical characteristics or optical characteristics of the elements constituting the coherent optical receiver 100.
- the optical input power Pin when the optical input power Pin is P0 or more, the optical input power Pin can be obtained from the gain A acquired from the peak detector 65 and the relationship shown in FIG. Alternatively, the optical input power Pin can be obtained by calculation using the gain A, the amplitude setting value V 0, and the values of the electrical characteristics or optical characteristics of the elements constituting the coherent optical receiver 100.
- the procedure for obtaining the optical input power Pin described in FIGS. 3 and 4 is executed in the control circuit 9.
- the control circuit 9 receives the gain A of the AGC amplifier 62 and the output amplitude V of the differential amplifier 6.
- the control circuit 9 also stores the maximum gain A0 of the AGC amplifier 62 and the set value V0 of the output amplitude.
- the control circuit 9 obtains the optical input power Pin by the above-described procedure based on the relationship between the gain A or the output amplitude V and the optical input power Pin.
- FIG. 5 is a flowchart showing an example of a procedure for the control circuit 9 to obtain the optical input power Pin using the relationship shown in FIGS. 3 and 4.
- the control circuit 9 may include a CPU (central processing unit) 91 and a memory 92.
- the memory 92 is a non-volatile storage medium that stores a program in a fixed manner.
- the memory 92 is a non-volatile semiconductor memory, but is not limited thereto.
- the CPU 91 may implement the function of the coherent optical receiver 100 described above by executing a program stored in the memory 92.
- the memory 92 may store actual measurement data or calculation results of the relationship between the output amplitude V of the differential amplifier 6 and the gain A of the AGC amplifier 62 and the optical power Pin of the signal light of the reception channel.
- the memory 92 may store the set value V0 of the output amplitude of the differential amplifier 6 and the maximum gain A0 of the AGC amplifier 62 during AGC control.
- FIG. 6 is a diagram illustrating an example of the relationship between the optical input power Pin, the amplitude V, the gain A, and the value obtained by dividing the amplitude by the gain (V / A) in the first embodiment.
- the thick broken line in FIG. 6 indicates the amplitude V and the gain A, and the solid line indicates V / A.
- FIG. 6 shows the values shown in FIG. 3 and FIG. 4 in one drawing, and further shows the value obtained by dividing the amplitude V by the gain A (V / A).
- the scale of each axis in FIG. 6 is arbitrary, and the hatched portion of the graph does not necessarily indicate a linear relationship between variables.
- Data of the solid line (output amplitude / gain) in FIG. 6 is stored in the control circuit 9, V / A is obtained from the amplitude V and gain A obtained during use, and the solid line data in FIG. 6 is referred to.
- the optical power Pin of the signal light of the reception channel can be obtained.
- the solid line data in FIG. 6 may be calculated based on the optical characteristics and electrical characteristics of the elements constituting the coherent optical receiver 100, as in the relationship in FIGS. 3 and 4, or the coherent optical receiver. You may obtain
- the coherent optical receiver 100 has a low level when the AGC amplifier circuit 62 is operating outside the dynamic range, that is, the optical input power Pin is outside the AGC control range. Even in this case, the optical input power Pin of the signal light of the reception channel can be measured. The reason is that the coherent optical receiver 100 obtains the optical input power Pin using the output amplitude V of the AGC amplifier 62 when the optical input power Pin is at a low level outside the range of AGC control. .
- the coherent optical receiver 100 of the first embodiment has an effect that the optical power of the received signal can be accurately detected in a wide optical input power range.
- the coherent optical receiver 100 according to the first embodiment can measure the optical power of the received signal without selecting a reception channel using an optical filter.
- LOS loss of signal
- the coherent optical receiver 100 of the first embodiment can measure the input level of signal light over a wide range, there is also an effect that the LOS detection range can be expanded.
- FIG. 7 is a block diagram illustrating a configuration of a coherent optical receiver 101 that is a modification of the first embodiment.
- the output amplitude V of the differential amplifier 6 is used.
- the DSP 8 may output the output amplitude data used inside the DSP 8 to the control circuit 9.
- the control circuit 9 converts the data input from the DSP 8 into the output amplitude V and uses it, the same effect as in the first embodiment can be obtained.
- the optical receiver according to the second embodiment includes a receiving unit, an amplifying unit, and a control unit.
- the optical receiver of the second embodiment includes a part of the configuration of the coherent optical receiver 100 of the first embodiment shown in FIG.
- the receiving unit receives the coherently modulated signal light and outputs a first electric signal converted from the signal light.
- the function of the receiving unit is realized by, for example, a part including PBS1, BS2, 90 degree hybrid 3, LO light source 4 and PD5 in FIG.
- the receiving unit receives the coherently modulated signal light, causes the signal light to interfere with the LO light, and outputs a beat signal generated by the interference to the amplifying unit as a first electric signal.
- the first electric signal is amplified by the amplification unit.
- the amplifying unit amplifies the first electric signal and outputs the amplified first electric signal as a second electric signal.
- the control unit obtains the optical power of the signal light based on the relationship between the optical power of the signal light in the reception unit, the gain of the amplification unit, and the amplitude of the second electric signal.
- the relationship between the optical power of the signal light in the receiving unit, the gain of the amplifying unit, and the amplitude of the second electric signal is measured when the optical receiver is manufactured, and the measurement result is stored in the control unit.
- the relationship between the optical power of the signal light in the receiving unit, the gain of the amplifying unit, and the amplitude of the second electric signal depends on the optical characteristics and electrical characteristics (loss, output of the LO light source) of the elements constituting the optical receiver.
- the optical power, the conversion efficiency of the light receiving element, the amplification characteristic of the amplifier, and the like may be obtained by calculation.
- the control unit obtains the gain of the amplification unit and the amplitude of the second electric signal from the amplification unit, divides the amplitude of the second electric signal by the gain of the amplification unit, and obtains the amplitude of the first electric signal. You may ask for it. Then, the control unit may obtain the optical power of the signal light from the relationship between the optical power of the signal light and the amplitude of the first electric signal, which are measured in advance.
- the optical receiver of the second embodiment having such a configuration can accurately know the optical power of the received signal in a wide optical input power range.
- the reason is that, regardless of whether the amplitude of the first electric signal is within the range of the dynamic range of the amplification unit or outside the range, the control unit outputs the gain of the amplification unit and the second output from the amplification unit. This is because the optical power of the signal light is obtained based on at least one of the amplitudes of the electric signal.
- the optical receiver of the third embodiment includes a receiving unit, an amplifying unit, and a control unit.
- the signal light received by the receiving unit is not limited to the coherently modulated signal light.
- the receiving unit of the optical receiver according to the third embodiment receives the signal light and outputs a first electric signal converted from the signal light.
- the function of the receiving unit is realized by a PD, for example.
- Other configurations of the optical receiver 3 of the third embodiment are the same as those of the optical receiver of the second embodiment.
- the optical receiver of the third embodiment having such a configuration can accurately know the optical power of the received signal in a wide optical input power range.
- the reason is that, regardless of whether the amplitude of the first electric signal is within the range of the dynamic range of the amplification unit or outside the range, the control unit outputs the gain of the amplification unit and the second output from the amplification unit. This is because the optical power of the signal light is obtained based on at least one of the amplitudes of the electric signal.
- the present invention is also applied to an optical receiver other than the coherent optical receiver.
- the present invention brings about an effect that a general optical receiver can accurately know the optical power of a received signal in a wide optical input power range.
- Coherent optical receiver 110 Signal light 1 PBS (polarization beam splitter) 2 BS (beam splitter) 3 90 degree hybrid 4 LO (local oscillation) light source 5 PD (light receiving element) 6 Differential Amplifier 61 TIA (Transimpedance Amplifier) 62 AGC (automatic gain control) amplifier 63 buffer 64 offset detector 65 peak detector 7 ADC (analog-to-digital converter) 8 DSP (signal processing circuit) 9 Control circuit 91 CPU (Central processing unit) 92 memory
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Abstract
Description
(発明の目的)
本発明の目的は、広い光入力パワーの範囲において、光フィルタを必要とせずに受信信号の光パワーを正確に検出できる光受信器、光受信方法及び光受信器の制御プログラムを提供することにある。
本発明の第1の実施形態について、図面を参照して説明する。図1は、本発明の第1の実施形態のコヒーレント光受信器100の構成を示すブロック図である。第1の実施形態のコヒーレント光受信器100は、PBS(polarization beam splitter、偏波ビームスプリッタ)1、BS(beam splitter、ビームスプリッタ)2、90度ハイブリッド3、LO(local oscillation、局部発振)光源4、を備える。第1の実施形態のコヒーレント光受信器100は、さらに、PD(photo diode、受光素子)5、差動増幅器6、ADC(analog-digital converter、アナログ-デジタル変換器)7、DSP(digital signal processor、信号処理回路)8、制御回路9を備える。なお、コヒーレント光受信器100の基本的な構成及び動作はよく知られているので、以下では一般的な構成及び動作については概要のみを説明する。
図7は、第1の実施形態の変形例であるコヒーレント光受信器101の構成を示すブロック図である。第1の実施形態のコヒーレント光受信器100では、差動増幅器6の出力振幅Vが用いられた。しかし、DSP8は、DSP8の内部で使用される出力振幅のデータを制御回路9に出力してもよい。制御回路9がDSP8から入力されたデータを出力振幅Vに換算して用いることで、第1の実施形態と同様の効果が得られる。
第2の実施形態の光受信器は、受信部と、増幅部と、制御部と、を備える。第2の実施形態の光受信器は、図1に示した第1の実施形態のコヒーレント光受信器100の構成の一部を備える。
第3の実施形態の光受信器は、受信部と、増幅部と、制御部と、を備える。第3の実施形態の光受信器では、受信部が受信する信号光は、コヒーレント変調された信号光に限定されない。
110 信号光
1 PBS(偏波ビームスプリッタ)
2 BS(ビームスプリッタ)
3 90度ハイブリッド
4 LO(局部発振)光源
5 PD(受光素子)
6 差動増幅器
61 TIA(トランスインピーダンス増幅器)
62 AGC(自動利得制御)増幅器
63 バッファ
64 オフセット検出器
65 ピーク検出器
7 ADC(アナログ-デジタル変換器)
8 DSP(信号処理回路)
9 制御回路
91 CPU(中央処理装置)
92 メモリ
Claims (6)
- コヒーレント変調された信号光を受信して、前記信号光から変換された第1の電気信号を出力する受信手段と、
前記第1の電気信号を増幅して、増幅された前記第1の電気信号を第2の電気信号として出力する増幅手段と、
前記受信手段における前記信号光の光パワーと、前記増幅手段の利得及び前記第2の電気信号の振幅の少なくとも一方と、の関係に基づいて前記信号光の光パワーを求める制御手段と、
を備える光受信器。 - 前記制御手段は、
前記増幅手段の利得が最大の利得を示している場合には、前記最大の利得、及び、前記第2の電気信号の振幅に基づいて前記信号光の光パワーを求め、
前記第2の電気信号の振幅が一定の振幅を示している場合には、前記増幅手段の利得、及び、前記一定の振幅に基づいて前記信号光の光パワーを求める、請求項1に記載された光受信器。 - 前記制御手段は、前記光受信器の製造時における、前記信号光の光パワーと、前記増幅手段の利得及び前記第2の電気信号の振幅と、の関係を記憶している、請求項1又は2に記載された光受信器。
- 前記増幅手段から入力された前記第2の電気信号をデジタル信号に変換して出力するアナログ-デジタル変換手段と、
前記アナログ-デジタル変換手段から入力された前記デジタル信号を処理して、前記信号光で伝送されたデータを再生する信号処理手段と、をさらに備え、
前記信号処理手段は、前記第2の電気信号の振幅に対応する信号を前記制御手段に出力し、前記制御手段は、前記第2の電気信号の振幅に対応する信号に基づいて前記第2の電気信号の振幅を求める、請求項1乃至3のいずれかに記載された光受信器。 - コヒーレント変調された信号光を受信し、
前記信号光から変換された第1の電気信号を出力し、
前記第1の電気信号を増幅し、
増幅された前記第1の電気信号を第2の電気信号として出力し、
前記信号光の受信時の光パワーと、前記第1の電気信号の増幅時の利得及び前記第2の電気信号の振幅の少なくとも一方と、の関係に基づいて前記信号光の光パワーを求める、
ことを特徴とする光受信方法。 - 光受信器のコンピュータに、
コヒーレント変調された信号光を受信する手順、
前記信号光から変換された第1の電気信号を出力する手順、
前記第1の電気信号を増幅する手順、
増幅された前記第1の電気信号を第2の電気信号として出力する手順、
前記信号光の受信時の光パワーと、前記第1の電気信号の増幅時の利得及び前記第2の電気信号の振幅の少なくとも一方と、の関係に基づいて前記信号光の光パワーを求める手順、
を実行させるための光受信器の制御プログラム、
を記録したプログラムの記憶媒体。
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