WO2013046284A1 - 光信号処理装置、及び光信号処理方法 - Google Patents
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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
- H04B10/6165—Estimation of the phase of the received optical signal, phase error estimation or phase error correction
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/04—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only
- H03F3/08—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only controlled by light
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/04—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only
- H03F3/08—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only controlled by light
- H03F3/087—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only controlled by light with IC amplifier blocks
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/45179—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using MOSFET transistors as the active amplifying circuit
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/45179—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using MOSFET transistors as the active amplifying circuit
- H03F3/45183—Long tailed pairs
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45479—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection
- H03F3/45632—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection in differential amplifiers with FET transistors as the active amplifying circuit
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/336—A I/Q, i.e. phase quadrature, modulator or demodulator being used in an amplifying circuit
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/45—Indexing scheme relating to differential amplifiers
- H03F2203/45702—Indexing scheme relating to differential amplifiers the LC comprising two resistors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/45—Indexing scheme relating to differential amplifiers
- H03F2203/45722—Indexing scheme relating to differential amplifiers the LC comprising one or more source followers, as post buffer or driver stages, in cascade in the LC
Definitions
- the present invention relates to an optical signal processing apparatus and an optical signal processing method for processing an optical signal.
- optical communication systems are increasing with the spread of the Internet.
- trunk systems research is being conducted to transmit signals at a speed exceeding 40 Gbit / s per wavelength.
- the bit rate per wavelength is increased, the signal quality deteriorates due to a decrease in the optical signal-to-noise ratio (OSNR) tolerance and waveform distortion caused by the chromatic dispersion, polarization mode dispersion, and nonlinear effects of the transmission line. Becomes larger.
- OSNR optical signal-to-noise ratio
- CMRR common mode noise rejection ratio
- the first optical signal generating means for generating the first optical signal by causing the received optical signal received from the outside and the local optical signal to interfere with each other with the first phase difference;
- Second optical signal generation means for generating a second optical signal by causing the received optical signal and the local optical signal to interfere with each other with a second phase difference shifted by ⁇ from the first phase difference;
- a first photoelectric conversion element that converts the first optical signal into a first electrical signal;
- DC component correction means for reducing the difference between the magnitude of the DC component of the first electrical signal and the magnitude of the DC component of the second electrical signal;
- a differential transimpedance circuit to which the first electric signal and the second electric signal after being corrected by the DC component correcting means are input;
- An optical signal processing device is provided.
- first optical signal processing means for generating a first digital signal by causing interference between a received optical signal received from the outside and a local optical signal under a first condition
- Second optical signal processing means for generating a second digital signal by causing the received optical signal and the local optical signal to interfere with each other under a second condition
- Digital processing means for processing the first digital signal and the second digital signal to extract a signal included in the received optical signal
- the first optical signal processing means includes First optical signal generating means for generating a first optical signal by causing the received optical signal and the local optical signal to interfere with each other in phase;
- Second optical signal generation means for generating a second optical signal by causing the received optical signal and the local optical signal to interfere with each other with a phase difference of ⁇ ;
- a first photoelectric conversion element that converts the first optical signal into a first electrical signal
- a second photoelectric conversion element that converts the second optical signal into a second electrical signal;
- First DC component correction means for reducing the difference between the DC component of the first electrical signal and the DC component
- the received optical signal received from the outside and the local optical signal output from the light source on the receiving side are caused to interfere with the first phase difference to generate the first optical signal, Causing the received optical signal and the local optical signal to interfere with each other with a second phase difference shifted by ⁇ from the first phase difference to generate a second optical signal; Converting the first optical signal into a first electrical signal; Converting the second optical signal into a second electrical signal; An optical signal that reduces the difference between the direct current component of the first electrical signal and the direct current component of the second electrical signal and then inputs the first electrical signal and the second electrical signal to a differential transimpedance circuit.
- a processing method is provided.
- the first optical signal generating means for generating the first optical signal by causing the received optical signal received from the outside and the local optical signal to interfere with each other with the first phase difference;
- Second optical signal generation means for generating a second optical signal by causing the received optical signal and the local optical signal to interfere with each other with a second phase difference shifted by ⁇ from the first phase difference;
- a first photoelectric conversion element that converts the first optical signal into a first electrical signal;
- DC component correcting means for reducing the DC component of the first electric signal and the DC component of the second electric signal;
- a differential transimpedance circuit to which the first electric signal and the second electric signal after being corrected by the DC component correcting means are input;
- An optical signal processing device is provided.
- DC component correction means for reducing the difference between the magnitude of the DC component of the first electrical signal and the magnitude of the DC component of the second electrical signal;
- a differential transimpedance circuit to which the first electric signal and the second electric signal after being corrected by the DC component correcting means are input;
- a transimpedance amplifier is provided.
- first optical signal processing means for generating a first digital signal by causing interference between a received optical signal received from the outside and a local optical signal under a first condition
- Second optical signal processing means for generating a second digital signal by causing the received optical signal and the local optical signal to interfere with each other under a second condition
- Digital processing means for processing the first digital signal and the second digital signal to extract a signal included in the received optical signal
- the first optical signal processing means includes First optical signal generating means for generating a first optical signal by causing the received optical signal and the local optical signal to interfere with each other in phase;
- Second optical signal generation means for generating a second optical signal by causing the received optical signal and the local optical signal to interfere with each other with a phase difference of ⁇ ;
- a first photoelectric conversion element that converts the first optical signal into a first electrical signal
- a second photoelectric conversion element that converts the second optical signal into a second electrical signal;
- First DC component correction means for reducing the DC component of the first electric signal and reducing the DC component of
- the present invention it is possible to suppress an increase in CMRR of the optical signal processing device. Further, according to the present invention, the dynamic range of the optical signal processing device can be increased.
- FIG. 1 is a block diagram illustrating a configuration of an optical signal processing device 10 according to the first embodiment.
- the optical signal processing device 10 is a device that receives an optical signal by, for example, a digital coherent method.
- the optical signal processing apparatus 10 includes an optical hybrid 100, four photoelectric conversion elements 150, differential transimpedance amplifiers 200 and 202, two AD conversion units 300, and a digital signal processing unit 400.
- the received optical signal received from the outside is separated into X polarization and Y polarization by the polarization beam splitter before being input to the optical signal processing device 10.
- One of the X polarization and the Y polarization is input to the optical signal processing device 10.
- the optical signal processing device 10 separates the X polarization or Y polarization of the input received optical signal into an in-phase baseband signal (I) optical signal and a quadrature baseband signal (Q) optical signal.
- the optical signal for the in-phase baseband signal (I) and the optical signal for the quadrature baseband signal (Q) are both polarized, and the directions of the polarization are orthogonal to each other.
- the differential transimpedance amplifiers 200 and 202 and the AD converter 300 perform coherent detection (for example, homodyne detection or heterodyne detection) on the optical signal for the in-phase baseband signal (I) and the optical signal for the quadrature baseband signal (Q). ) To convert into in-phase baseband signal (I) and quadrature baseband signal (Q).
- the digital signal processing unit 400 reproduces the transmitted multilevel modulated optical signal from the in-phase baseband signal and the quadrature baseband signal, and performs demodulation processing on the multilevel modulated optical signal.
- the optical hybrid 100 generates the first optical signal by causing the local light to interfere with the X polarization (or Y polarization) of the received optical signal received from the outside with the first phase difference.
- the optical hybrid 100 also generates a second optical signal by causing local light to interfere with the X polarization (or Y polarization) of the received optical signal with a second phase difference that is shifted by ⁇ from the first phase difference. To do.
- the optical hybrid 100 includes an optical mixer 112 (first optical signal generation unit), 114 (second optical signal generation unit), 122 (third optical signal generation unit), and 124 (fourth optical signal generation unit). , And optical phase shifters 116, 126, and 128.
- the X polarization (or Y polarization) of the received optical signal is input to each of the optical mixers 112, 114, 122, and 124.
- Local light is input to the optical mixer 112 without passing through any phase shifter.
- Local light is input to the optical mixer 114 via the optical phase shifter 116.
- the optical phase shifter 116 shifts the phase of the local light by ⁇ .
- Local light is input to the optical mixer 122 via the optical phase shifter 126.
- the optical phase shifter 126 shifts the phase of the local light by ⁇ / 2 in the same direction as the optical phase shifter 116.
- Local light is input to the optical mixer 124 via the optical phase shifter 126 and the optical phase shifter 126.
- the optical phase shifter 128 shifts the phase of the local light by ⁇ in the same direction as the optical phase shifter 126.
- the optical mixer 112 generates the first optical signal by causing the X polarization (or Y polarization) of the received optical signal to interfere with the local light in the same phase, and the optical mixer 114 performs the X polarization ( (Or Y polarization) and local light are interfered with each other by a phase difference ⁇ to generate a second optical signal.
- the optical mixer 122 generates a third optical signal by causing X-polarization (or Y-polarization) of the received optical signal to interfere with the local light with a phase difference of ⁇ / 2, and the optical mixer 124 performs X of the received optical signal.
- the fourth optical signal is generated by causing the polarization (or Y polarization) and the local light to interfere with each other with a phase difference of 3 ⁇ / 2.
- the first optical signal and the second optical signal form a set of signals, and the third optical signal and the fourth optical signal also form a set of signals.
- the four photoelectric conversion elements 150 photoelectrically convert the first optical signal, the second optical signal, the third optical signal, and the fourth optical signal, respectively, to obtain a first electrical signal, a second electrical signal, a third electrical signal, And a fourth electrical signal is generated.
- the photoelectric conversion element 150 is, for example, a photodiode.
- the first electric signal and the second electric signal are input to the differential transimpedance amplifier 200, and the third electric signal and the fourth electric signal are input to the differential transimpedance amplifier 202.
- the differential transimpedance amplifier 200 includes a DC component correction unit 210, a transimpedance circuit 240, and a variable gain amplifier 250.
- the DC component correction unit 210 reduces the difference between the magnitude of the DC component of the first electric signal and the magnitude of the DC component of the second electric signal. Details of the configuration of the DC component correction unit 210 will be described later.
- the transimpedance circuit 240 receives the first electric signal and the second electric signal after the DC component is corrected by the DC component correction unit 210.
- the variable gain amplifier 250 amplifies the magnitude of the output of the transimpedance circuit 240 and outputs it to the AD conversion unit 300.
- the differential transimpedance amplifier 202 also includes a DC component correction unit 210, a transimpedance circuit 240, and a variable gain amplifier 250.
- the differential transimpedance amplifier 202 is different from the differential transimpedance amplifier 200 except that a third electrical signal is input instead of the first electrical signal and a fourth electrical signal is input instead of the second electrical signal. It has the same function.
- the AD converter 300 converts the two analog signals output from the differential transimpedance amplifier 200 into digital signals.
- This digital signal is an in-phase baseband signal.
- the AD converter 302 converts the two analog signals output from the differential transimpedance amplifier 202 into digital signals.
- This digital signal is an orthogonal baseband signal.
- CMRR common mode rejection ratio
- CMRR quadrature phase shift keying
- the received optical signal input to the first input unit 102 is converted into the first optical signal, the second optical signal, the third optical signal, and the fourth optical signal in the optical hybrid 100.
- the received optical signal input to the first input unit 102 is expressed by the following equation (2), and the local light is expressed by the following equation (3).
- ⁇ 1 is the frequency of the received optical signal
- ⁇ is the frequency of the local light
- ⁇ is the phase.
- ⁇ 0 in the generation of the first optical signal
- ⁇ ⁇ in the generation of the second optical signal
- ⁇ ⁇ / 2 in the generation of the third optical signal
- ⁇ 3 ⁇ / 2.
- the first optical signal is represented by the following equation (4)
- the second optical signal is represented by the following equation (5)
- the third optical signal is represented by the following (6)
- the fourth optical signal is expressed by the following expression (7).
- A, b, c, d are coefficients resulting from the quantum efficiency of the photoelectric conversion element 150 and the loss of the optical hybrid 100.
- the first and second terms are DC components (offset components), and the third term is signal phase information.
- the output of the transimpedance circuit 240 of the differential transimpedance amplifier 200 is expressed by the following equations (8) and (9).
- the output of the transimpedance circuit 240 of the differential transimpedance amplifier 202 is expressed by the following equations (10) and (11).
- the differential signals (8) and (9) are input to the variable gain amplifier 250 of the differential transimpedance amplifier 200.
- the differential signals (10) and (11) are input to the variable gain amplifier 250 of the differential transimpedance amplifier 200.
- the light intensity B 2 of the local light is 10 times or more the intensity A 2 of the received optical signal, B 2 is dominant in (8) to (11). Therefore, when a difference occurs between the coefficients a and b in (8) and (9), the DC level of the output signal of the transimpedance circuit 240 of the differential transimpedance amplifier 200 changes greatly. Further, when a difference occurs between the coefficients c and d in (10) and (11), the DC level of the output signal of the transimpedance circuit 240 of the differential transimpedance amplifier 202 changes greatly. For this reason, when CMRR is insufficient, the accuracy of waveform distortion equalization by the variable gain amplifier 250 and the digital signal processing unit 400 is lowered.
- the DC component correction unit 210 performs the difference between the magnitude of the DC component of the first electrical signal and the magnitude of the DC component of the second electrical signal (or the magnitude of the DC component of the third electrical signal).
- the difference in the magnitude of the DC component of the fourth electric signal is reduced. Therefore, it is possible to suppress an increase in CMRR and suppress a decrease in signal processing accuracy by the optical signal processing device 10.
- FIG. 2 is a diagram showing details of the configuration of the DC component correction unit 210 in the differential transimpedance amplifier 200 together with the optical hybrid 100 and the transimpedance circuit 240.
- the optical hybrid 100 is simplified compared to FIG.
- the DC component correction unit 210 includes a first transistor 222, a second transistor 224, and a constant current source 230.
- the first transistor 222 and the second transistor 224 are bipolar transistors, but may be field effect transistors such as MOS transistors.
- the first transistor 222 and the second transistor 224 constitute a differential circuit 220.
- the first transistor 222 has a collector (a drain in the case of a field effect transistor) connected to a wiring for inputting the first electric signal to the DC component correction unit 210, and an emitter (a source in the case of a field effect transistor) is defined. It is connected to the input side of the current source 230.
- the second transistor 224 has a collector connected to a wiring for inputting the second electric signal to the DC component correction unit 210, and an emitter connected to the input side of the constant current source 230.
- the output side of the constant current source 230 is grounded through, for example, a resistor (not shown).
- the above connection example shows the case where the first transistor 222 and the second transistor 224 are NPN bipolar transistors. However, the first transistor 222 and the second transistor 224 may be PNP-type bipolar transistors. In this case, the same effect as the above-described example can be obtained by appropriately changing the design.
- the DC component correction unit 210 of the differential transimpedance amplifier 202 also has the exception that the third electric signal is input to the collector of the first transistor 222 and the fourth electric signal is input to the collector of the second transistor 224.
- the DC component correction unit 210 of the differential transimpedance amplifier 200 has the same configuration.
- the transimpedance circuit 240 has a differential amplifier, two emitter follower circuits, and two feedback resistors.
- the DC component I PD1 of the first electrical signal is a direct current component I PD2 of the second electric signal equal to the input control voltage to the first transistor 222 (base) V 1 and the input control voltage to the second transistor 224 (base) V 2 is set to the same potential using the control unit 228.
- the current I c1 flowing through the first transistor 222 is equal to the current I c2 flowing through the second transistor 224.
- the direct current component (I PD1 -I c1 ) of the first electric signal input to the transimpedance circuit 240 is equal to the direct current component (I PD2 -I c2 ) of the second electric signal.
- the control voltage is applied to the first transistor 222 using the control unit 228 ( Base) V 1 is set larger than the input control voltage (base) V 2 to the second transistor 224.
- the current I c1 flowing through the first transistor 222 becomes larger than the current I c2 flowing through the second transistor 224 (I C1 > I C2 ).
- a control unit 228 may be provided as shown in FIG.
- the control unit 228 controls the input control voltage of the first transistor 222 and the input control voltage of the second transistor 224 based on the potentials of the two output signals (differential signals) of the transimpedance circuit 240.
- the control unit 228 controls the control voltage of the first transistor 222 based on the potential of the first output (P signal) of the transimpedance circuit 240, and the second output (N
- the control voltage of the second transistor 224 is controlled based on the potential of the signal.
- the operation of the DC component correction unit 210 is not limited to the food back control from the output of the transimpedance circuit 240 only.
- the first transistor 222 and the second transistor 224 may operate through the control unit 228 in accordance with a detection value by another detection method or an external input.
- details of the control by the control unit 228 are as described with reference to FIG.
- FIG. 3 shows an example of the waveform of the output signal after demodulation of the transimpedance circuit 240 when the received optical signal is 31.78911 Gb / s QPSK.
- FIG. 4 shows an example of an output waveform of the transimpedance circuit 240 when the DC component correction unit 210 is not provided. Comparing these, it can be seen that by providing the DC component correction unit 210, the current difference is corrected and the output waveform of the transimpedance circuit 240 is improved accordingly.
- the direct current components of the first electric signal and the second electric signal are reduced by controlling the first transistor 222 and the second transistor 224. (0 is also possible depending on the configuration of the DC component correction unit 210). Thereby, the input dynamic range required for the transimpedance circuit 240 can be reduced.
- FIG. 18 shows a current signal output from the photoelectric conversion element 150 when the received optical signal is ⁇ 12 dBm and the local optical signal is 12 dBm.
- the modulation signal is 0.4 mApp.
- the direct current component is 1.8 mA, which is large with respect to the modulation signal. Even if such a current signal is input to the transimpedance circuit 240, it is extremely difficult to maintain the linearity of the transimpedance circuit 240. As a result, the demodulated signal is distorted.
- FIG. 17 shows the relationship between the currents I c1 and I c2 flowing through the first transistor 222 and the second transistor 224. To compensate for the difference in DC current I PD1 and I PD2 in I c1 and I c2 difference, suppresses excessive DC current of the PD with the same current value I c1 and I c2.
- FIG. 7 shows the relationship between the received optical signal and the optical power of the local light determined by the standardization committee of OIF (Optical Internetwoking Forum). It can be seen that the optical power of the local light is 10 times or more larger than the received optical signal. Since the coherent receiver requires high linearity, the differential transimpedance amplifier requires a wide input dynamic range. In the present embodiment, as described above, the dynamic range required for the transimpedance circuit 240 can be reduced.
- FIG. 8 is a diagram illustrating a configuration of the DC component correction unit 210 used in the optical signal processing device 10 according to the second embodiment.
- the optical signal processing apparatus 10 according to the present embodiment has the DC component correction unit according to the first embodiment shown in FIG. 2 except that the constant current source 230 of the DC component correction unit 210 is a current mirror circuit.
- the configuration is the same as 210.
- This current mirror circuit includes transistors 232 and 234.
- the transistors 232 and 234 are, for example, bipolar transistors, but may be field effect transistors.
- the base of the transistor 234 is connected to the collector.
- the collector of the transistor 232 is connected to the emitters of the first transistor 222 and the second transistor 224, and the collector of the transistor 234 is connected to the outside.
- the same effect as that of the first embodiment can be obtained.
- the direct current components of the first electric signal and the second electric signal can be reduced by controlling the input to the collector of the transistor 234 of the current mirror circuit. Accordingly, the dynamic range required for the transimpedance circuit 240 can be particularly reduced.
- FIG. 9 is a diagram illustrating the configuration of the control unit 228 of the optical signal processing device 10 according to the third embodiment, together with another configuration of the DC component correction unit 210 and the transimpedance circuit 240.
- the optical signal processing apparatus 10 according to the present embodiment has the same configuration as that of the optical signal processing apparatus 10 according to the second embodiment except for the configuration of the control unit 228.
- the control unit 228 includes an integration unit 270 and a level conversion unit 280.
- the integration unit 270 has two integration circuits. These two integrating circuits integrate each of the two output signals of the transimpedance circuit 240 and detect the potential of each output signal.
- the level converter 280 converts the output levels of the two integrating circuits. The two outputs of the level converter 280 are input to the collector of the first transistor 222 and the collector of the second transistor 224, respectively.
- the outputs OUTP and OUTN of the transimpedance circuit 240 have the same level of compensation. A signal is output. Therefore, the input control voltage (base) to the first transistor 222 and the input control voltage (base) to the second transistor 224 are set to the same potential through the level conversion circuit 280. As a result, the current I c1 flowing through the first transistor 222 is equal to the current I c2 flowing through the second transistor 224. In this case, the direct current component (I PD1 -I c1 ) of the first electric signal input to the transimpedance circuit 240 is equal to the direct current component (I PD2 -I c2 ) of the second electric signal.
- adjusting the voltage terminal V CM of the current mirror circuit 230 can be reduced DC component of the first electrical signal and the second electrical signal inputted to the transimpedance circuit 11 to zero. In this way, a sufficient input dynamic range of the transimpedance circuit 240 can be secured.
- the outputs OUTP and OUTN of the transimpedance circuit 240 Outputs a complementary signal having a different level. This is detected by the integrating circuit 20.
- the level difference detected by the integration circuit 270 is converted into an appropriate voltage range through the level conversion circuit 280.
- the input control voltage (base) to the first transistor 222 and the input control voltage (base) to the second transistor 224 are set to appropriate values.
- the current I c1 flowing through the first transistor 222 and the current I c2 flowing through the second transistor 224 satisfy I c1 > I c2 .
- the above operation is repeated until the levels of the outputs OUTP and OUTN of the transimpedance circuit 240 become the same.
- FIG. 10 is a diagram illustrating a configuration of the differential transimpedance amplifier 200 of the optical signal processing device 10 according to the fourth embodiment.
- the differential transimpedance amplifier 200 according to the present embodiment is the same as the optical signal processing device 10 according to the third embodiment except that the constant current source 230 of the DC component correction unit 210 is the third transistor 290. It is a configuration.
- the bipolar transistor can be replaced with a field effect transistor.
- the differential transimpedance amplifier 202 shown in FIG. 1 has the same configuration as that of the differential transimpedance amplifier 200. According to this embodiment, the same effect as that of the third embodiment can be obtained.
- FIG. 11 is a diagram illustrating the configuration of the DC component correction unit 210 of the optical signal processing device 10 according to the fifth embodiment, together with the transimpedance circuit 240.
- the optical signal processing apparatus 10 according to the present embodiment is an optical signal according to the first embodiment, except that the differential transimpedance amplifier 200 does not include the control unit 228 and the configuration of the DC component correction unit 210.
- the configuration is the same as that of the signal processing device 10.
- the DC component correction unit 210 includes a first transistor 222, a second transistor 224, and a fourth transistor 226.
- the same signal is input from the control unit 228 to the base of the first transistor 222 and the base of the second transistor 224.
- the fourth transistor 226 has a base and a collector connected to the base of the second transistor 224.
- the emitters of the first transistor 222, the second transistor 224, and the fourth transistor 226 are all grounded via a resistor (not shown), for example.
- FIG. 12 is a diagram illustrating the configuration of the DC component correction unit 210 of the optical signal processing device 10 according to the sixth embodiment, together with the transimpedance circuit 240.
- the differential transimpedance amplifier 200 does not include the control unit 228, and the DC component correction unit 210 does not include the fourth transistor 226.
- the configuration is the same as that of the optical signal processing apparatus 10 according to the fifth embodiment. Also in this embodiment, the same effect as that of the fifth embodiment can be obtained.
- FIG. 15 is a diagram illustrating a configuration of an optical signal processing device according to the seventh embodiment.
- the optical signal processing unit according to the present embodiment is an optical signal processing unit that receives an optical signal by a digital coherent method.
- the optical signal processing unit includes an optical signal processing device 12, an electrical signal processing device 20, and a local light source 500.
- the optical signal processing device 12 has two signal processing units 14.
- Each of the signal processing units 14 includes an optical hybrid 100, four photoelectric conversion elements 150, and differential transimpedance amplifiers 200 and 202.
- the optical hybrid 100, the four photoelectric conversion elements 150, and the differential transimpedance amplifiers 200 and 202 of the signal processing unit 14 are the same as the optical hybrid 100, the four photoelectric conversion elements 150, and the difference shown in the first to sixth embodiments.
- the configuration is the same as that of the dynamic transimpedance amplifiers 200 and 202.
- the received signal light input to the first input unit 102 of the optical signal processing device 12 is separated into X polarization and Y polarization by the polarization beam splitter 600.
- the X polarization and the Y polarization are input to different signal processing units 14.
- a local light source 500 is connected to the second input unit 104 of the optical signal processing device 12.
- the local light source 500 inputs local light to the second input unit 104.
- the local light input to 140 is separated into two lights by the beam splitter 602. The two lights are input to different signal processing units 14.
- the electric signal processing device 20 has two AD conversion groups 304 and a digital signal processing unit 400.
- Each AD conversion group 304 includes AD conversion units 300 and 302.
- the first AD conversion group 304 receives a signal from the first signal processing unit 14 included in the optical signal processing device 12, and the second AD conversion group 304 includes second signal processing included in the optical signal processing device 12.
- a signal is input from the unit 14.
- the digital signal processing unit 400 processes the outputs from the two AD conversion groups 304 and generates a demodulated signal.
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Abstract
Description
前記受信光信号と前記ローカル光信号とを、前記第1の位相差からπずれた第2の位相差で干渉させて第2光信号を生成する第2光信号生成手段と、
前記第1光信号を第1電気信号に変換する第1光電変換素子と、
前記第2光信号を第2電気信号に変換する第2光電変換素子と、
前記第1電気信号の直流成分の大きさと、前記第2電気信号の直流成分の大きさの差を小さくする直流成分補正手段と、
前記直流成分補正手段が補正した後の前記第1電気信号及び前記第2電気信号が入力される差動型のトランスインピーダンス回路と、
を備える光信号処理装置が提供される。
前記受信光信号と前記ローカル光信号とを、第2の条件で干渉させることにより第2デジタル信号を生成する第2光信号処理手段と、
前記第1デジタル信号及び前記第2デジタル信号を処理して前記受信光信号に含まれる信号を取り出すデジタル処理手段と、
を備え、
前記第1光信号処理手段は、
前記受信光信号と前記ローカル光信号とを同相で干渉させて第1光信号を生成する第1光信号生成手段と、
前記受信光信号と前記ローカル光信号とを位相差πで干渉させて第2光信号を生成する第2光信号生成手段と、
前記第1光信号を第1電気信号に変換する第1光電変換素子と、
前記第2光信号を第2電気信号に変換する第2光電変換素子と、
前記第1電気信号の直流成分及び前記第2電気信号の直流成分の差を小さくする第1直流成分補正手段と、
前記直流成分補正手段が補正した後の前記第1電気信号及び前記第2電気信号が入力される差動型の第1トランスインピーダンスアンプと、
前記第1トランスインピーダンスアンプの出力を前記第1デジタル信号に変換する第1AD変換手段と、
を有し、
前記第2光信号処理手段は、
前記受信光信号と前記ローカル光信号とを位相差π/2で干渉させて第3光信号を生成する第3光信号生成手段と、
前記受信光信号と前記ローカル光信号とを位相差3π/2で干渉させて第4光信号を生成する第4光信号生成手段と、
前記第3光信号を第3電気信号に変換する第3光電変換素子と、
前記第4光信号を第4電気信号に変換する第4光電変換素子と、
前記第3電気信号の直流成分及び前記第4電気信号の直流成分の差を小さくする第2直流成分補正手段と、
前記直流成分補正手段が補正した後の前記第3電気信号及び前記第4電気信号が入力される差動型の第2トランスインピーダンスアンプと、
前記第2トランスインピーダンスアンプの出力を前記第2デジタル信号に変換する第2AD変換手段と、
を有する光信号処理装置が提供される。
前記受信光信号と前記ローカル光信号とを、前記第1の位相差からπずれた第2の位相差で干渉させて第2光信号を生成し、
前記第1光信号を第1電気信号に変換し、
前記第2光信号を第2電気信号に変換し、
前記第1電気信号の直流成分及び前記第2電気信号の直流成分の差を小さくした上で、前記第1電気信号及び前記第2電気信号を差動型のトランスインピーダンス回路に入力する、光信号処理方法が提供される。
前記受信光信号と前記ローカル光信号とを、前記第1の位相差からπずれた第2の位相差で干渉させて第2光信号を生成する第2光信号生成手段と、
前記第1光信号を第1電気信号に変換する第1光電変換素子と、
前記第2光信号を第2電気信号に変換する第2光電変換素子と、
前記第1電気信号の直流成分、及び前記第2電気信号の直流成分を小さくする直流成分補正手段と、
前記直流成分補正手段が補正した後の前記第1電気信号及び前記第2電気信号が入力される差動型のトランスインピーダンス回路と、
を備える光信号処理装置が提供される。
前記直流成分補正手段が補正した後の前記第1電気信号及び前記第2電気信号が入力される差動型のトランスインピーダンス回路と、
を有するトランスインピーダンスアンプが提供される。
前記受信光信号と前記ローカル光信号とを、第2の条件で干渉させることにより第2デジタル信号を生成する第2光信号処理手段と、
前記第1デジタル信号及び前記第2デジタル信号を処理して前記受信光信号に含まれる信号を取り出すデジタル処理手段と、
を備え、
前記第1光信号処理手段は、
前記受信光信号と前記ローカル光信号とを同相で干渉させて第1光信号を生成する第1光信号生成手段と、
前記受信光信号と前記ローカル光信号とを位相差πで干渉させて第2光信号を生成する第2光信号生成手段と、
前記第1光信号を第1電気信号に変換する第1光電変換素子と、
前記第2光信号を第2電気信号に変換する第2光電変換素子と、
前記第1電気信号の直流成分を小さくするとともに、前記第2電気信号の直流成分を小さくする第1直流成分補正手段と、
前記直流成分補正手段が補正した後の前記第1電気信号及び前記第2電気信号が入力される差動型の第1トランスインピーダンスアンプと、
前記第1トランスインピーダンスアンプの出力を前記第1デジタル信号に変換する第1AD変換手段と、
を有し、
前記第2光信号処理手段は、
前記受信光信号と前記ローカル光信号とを位相差π/2で干渉させて第3光信号を生成する第3光信号生成手段と、
前記受信光信号と前記ローカル光信号とを位相差3π/2で干渉させて第4光信号を生成する第4光信号生成手段と、
前記第3光信号を第3電気信号に変換する第3光電変換素子と、
前記第4光信号を第4電気信号に変換する第4光電変換素子と、
前記第3電気信号の直流成分を小さくするとともに、前記第4電気信号の直流成分を小さくする第2直流成分補正手段と、
前記直流成分補正手段が補正した後の前記第3電気信号及び前記第4電気信号が入力される差動型の第2トランスインピーダンスアンプと、
前記第2トランスインピーダンスアンプの出力を前記第2デジタル信号に変換する第2AD変換手段と、
を有する光信号処理装置が提供される。
図1は、第1の実施形態に係る光信号処理装置10の構成を示すブロック図である。光信号処理装置10は、例えばデジタルコヒーレント方式で光信号を受信する装置である。光信号処理装置10は、光ハイブリッド100、4つの光電変換素子150、差動トランスインピーダンスアンプ200,202、2つのAD変換部300、及びデジタル信号処理部400を備えている。
図8は、第2の実施形態に係る光信号処理装置10に用いられる直流成分補正部210の構成を示す図である。本実施形態に係る光信号処理装置10は、直流成分補正部210の定電流源230が、カレントミラー回路である点を除いて、図2に示した第1の実施形態に係る直流成分補正部210と同様の構成である。
図9は、第3の実施形態に係る光信号処理装置10の制御部228の構成を、直流成分補正部210の他の構成及びトランスインピーダンス回路240とともに示す図である。本実施形態に係る光信号処理装置10は、制御部228の構成を除いて第2の実施形態に係る光信号処理装置10と同様の構成である。
図10は、第4の実施形態に係る光信号処理装置10の差動トランスインピーダンスアンプ200の構成を示す図である。本実施形態に係る差動トランスインピーダンスアンプ200は、直流成分補正部210の定電流源230が第3トランジスタ290である点を除いて、第3の実施形態に係る光信号処理装置10と同様の構成である。なお、本実施形態及び他の実施形態のすべてにおいて、バイポーラトランジスタを電界効果トランジスタに置き換えることもできる。
本実施形態によっても、第3の実施形態と同様の効果を得ることができる。
図11は、第5の実施形態に係る光信号処理装置10の直流成分補正部210の構成を、トランスインピーダンス回路240とともに示す図である。本実施形態に係る光信号処理装置10は、差動トランスインピーダンスアンプ200が制御部228を有していない点、及び、直流成分補正部210の構成を除いて、第1の実施形態に係る光信号処理装置10と同様の構成である。
(第6の実施形態)
図12は、第6の実施形態に係る光信号処理装置10の直流成分補正部210の構成を、トランスインピーダンス回路240とともに示す図である。本実施形態に係る光信号処理装置10は、差動トランスインピーダンスアンプ200が制御部228を有していない点、及び、直流成分補正部210が第4トランジスタ226を有していない点を除いて、第5の実施形態に係る光信号処理装置10と同様の構成である。
本実施形態によっても、第5の実施形態と同様の効果を得ることができる。
図15は、第7の実施形態に係る光信号処理装置の構成を示す図である。本実施形態に係る光信号処理ユニットは、デジタルコヒーレント方式で光信号を受信する光信号処理ユニットである。この光信号処理ユニットは、光信号処理装置12、電気信号処理装置20、及びローカル光源500を有している。
Claims (21)
- 外部から受信した受信光信号とローカル光信号とを第1の位相差で干渉させて第1光信号を生成する第1光信号生成手段と、
前記受信光信号と前記ローカル光信号とを、前記第1の位相差からπずれた第2の位相差で干渉させて第2光信号を生成する第2光信号生成手段と、
前記第1光信号を第1電気信号に変換する第1光電変換素子と、
前記第2光信号を第2電気信号に変換する第2光電変換素子と、
前記第1電気信号の直流成分の大きさと、前記第2電気信号の直流成分の大きさの差を小さくする直流成分補正手段と、
前記直流成分補正手段が補正した後の前記第1電気信号及び前記第2電気信号が入力される差動型のトランスインピーダンス回路と、
を備える光信号処理装置。 - 請求項1に記載の光信号処理装置において、
前記直流成分補正手段は、
前記第1光電変換素子と前記トランスインピーダンス回路の間に接続される第1トランジスタと、
前記第2光電変換素子と前記トランスインピーダンス回路の間に接続される第2トランジスタと、
前記第1トランジスタを介して第1光電変換素子と前記トランスインピーダンス回路の間に接続されるとともに、前記第2トランジスタを介して第2光電変換素子と前記トランスインピーダンス回路の間に接続される定電流源と、
を備える光信号処理装置。 - 請求項2に記載の光信号処理装置において、
前記第1トランジスタの制御電圧及び前記第2トランジスタの制御電圧を制御する制御手段を備え、
前記制御手段は、
前記トランスインピーダンス回路の2つの出力信号に基づいて、前記第1トランジスタの制御電圧及び前記第2トランジスタの制御電圧を制御する光信号処理装置。 - 請求項3に記載の光信号処理装置において、
前記制御手段は、前記トランスインピーダンス回路の2つの出力信号それぞれを積分する2つの積分回路と、
前記2つの積分回路それぞれの出力レベルを変換するレベル変換部と、
を備え、
前記レベル変換部の2つの出力が、前記第1トランジスタのゲート電圧及び前記第2トランジスタのゲート電圧として入力される光信号処理装置。 - 請求項2~4のいずれか一項に記載の光信号処理装置において、
前記定電流源は、カレントミラー回路を有している光信号処理装置。 - 請求項3又は4に記載の光信号処理装置において、
前記制御手段は、前記カレントミラー回路を制御する光信号処理装置。 - 請求項1に記載の光信号処理装置において、
前記直流成分補正手段は、
前記第1光電変換素子と前記トランスインピーダンス回路の間に接続される第1トランジスタと、
前記第2光電変換素子と前記トランスインピーダンス回路の間に接続される第2トランジスタと、
前記第1トランジスタを介して第1光電変換素子と前記トランスインピーダンス回路の間に接続されるとともに、前記第2トランジスタを介して第2光電変換素子と前記トランスインピーダンス回路の間に接続される第3トランジスタと、
前記第1トランジスタの制御電圧及び前記第2トランジスタの制御電圧を制御する制御手段と、
を備える光信号処理装置。 - 請求項1~7のいずれか一項に記載の光信号処理装置において、
前記トランスインピーダンス回路の2つの出力信号をデジタル信号に変換するAD変換手段をさらに備える光信号処理装置。 - 請求項1~8のいずれか一項に記載の光信号処理装置において、
前記直流成分補正手段は、前記第1電気信号及び前記第2電気信号それぞれの直流成分を小さくする光信号処理装置。 - 請求項1~9のいずれか一項に記載の光信号処理装置において、
前記第1の位相差は0、又はπ/2である光信号処理装置。 - 外部から受信した受信光信号とローカル光信号とを、第1の条件で干渉させることにより第1デジタル信号を生成する第1光信号処理手段と、
前記受信光信号と前記ローカル光信号とを、第2の条件で干渉させることにより第2デジタル信号を生成する第2光信号処理手段と、
前記第1デジタル信号及び前記第2デジタル信号を処理して前記受信光信号に含まれる信号を取り出すデジタル処理手段と、
を備え、
前記第1光信号処理手段は、
前記受信光信号と前記ローカル光信号とを同相で干渉させて第1光信号を生成する第1光信号生成手段と、
前記受信光信号と前記ローカル光信号とを位相差πで干渉させて第2光信号を生成する第2光信号生成手段と、
前記第1光信号を第1電気信号に変換する第1光電変換素子と、
前記第2光信号を第2電気信号に変換する第2光電変換素子と、
前記第1電気信号の直流成分及び前記第2電気信号の直流成分の差を小さくする第1直流成分補正手段と、
前記直流成分補正手段が補正した後の前記第1電気信号及び前記第2電気信号が入力される差動型の第1トランスインピーダンスアンプと、
前記第1トランスインピーダンスアンプの出力を前記第1デジタル信号に変換する第1AD変換手段と、
を有し、
前記第2光信号処理手段は、
前記受信光信号と前記ローカル光信号とを位相差π/2で干渉させて第3光信号を生成する第3光信号生成手段と、
前記受信光信号と前記ローカル光信号とを位相差3π/2で干渉させて第4光信号を生成する第4光信号生成手段と、
前記第3光信号を第3電気信号に変換する第3光電変換素子と、
前記第4光信号を第4電気信号に変換する第4光電変換素子と、
前記第3電気信号の直流成分及び前記第4電気信号の直流成分の差を小さくする第2直流成分補正手段と、
前記直流成分補正手段が補正した後の前記第3電気信号及び前記第4電気信号が入力される差動型の第2トランスインピーダンスアンプと、
前記第2トランスインピーダンスアンプの出力を前記第2デジタル信号に変換する第2AD変換手段と、
を有する光信号処理信装置。 - 請求項11に記載の光信号処理装置において、
前記第1直流成分補正手段及び前記第2直流成分補正手段は、いずれも、
前記第1光電変換素子と前記トランスインピーダンス回路の間に接続される第1トランジスタと、
前記第2光電変換素子と前記トランスインピーダンス回路の間に接続される第2トランジスタと、
前記第1トランジスタを介して第1光電変換素子と前記トランスインピーダンス回路の間に接続されるとともに、前記第2トランジスタを介して第2光電変換素子と前記トランスインピーダンス回路の間に接続される定電流源と、
を備える光信号処理装置。 - 請求項12に記載の光信号処理装置において、
前記第1トランジスタの制御電圧及び前記第2トランジスタの制御電圧を制御する制御手段を備え、
前記制御手段は、
前記トランスインピーダンス回路の2つの出力信号に基づいて、前記第1トランジスタの制御電圧及び前記第2トランジスタの制御電圧を制御する光信号処理装置。 - 請求項13に記載の光信号処理装置において、
前記制御手段は、前記トランスインピーダンス回路の2つの出力信号それぞれを積分する2つの積分回路と、
前記2つの積分回路それぞれの出力レベルを変換するレベル変換部と、
を備え、
前記レベル変換部の2つの出力が、前記第1トランジスタのゲート電圧及び前記第2トランジスタのゲート電圧として入力される光信号処理装置。 - 請求項12~14のいずれか一項に記載の光信号処理装置において、
前記定電流源は、カレントミラー回路を有している光信号処理装置。 - 請求項15に記載の光信号処理装置において、
前記カレントミラー回路を制御する第2制御手段を備える光信号処理装置。 - 請求項11~16のいずれか一項に記載の光信号処理装置において、
前記第1直流成分補正手段は、前記第1電気信号及び前記第2電気信号それぞれの直流成分を小さくし、
前記第2直流成分補正手段は、前記第3電気信号及び前記第4電気信号それぞれの直流成分を小さくする光信号処理装置。 - 第1電気信号の直流成分の大きさと、前記第2電気信号の直流成分の大きさの差を小さくする直流成分補正手段と、
前記直流成分補正手段が補正した後の前記第1電気信号及び前記第2電気信号が入力される差動型のトランスインピーダンス回路と、
を有するトランスインピーダンスアンプ。 - 外部から受信した受信光信号と、受信側の光源から出力されたローカル光信号とを、第1の位相差で干渉させて第1光信号を生成し、
前記受信光信号と前記ローカル光信号とを、前記第1の位相差からπずれた第2の位相差で干渉させて第2光信号を生成し、
前記第1光信号を第1電気信号に変換し、
前記第2光信号を第2電気信号に変換し、
前記第1電気信号の直流成分及び前記第2電気信号の直流成分の差を小さくした上で、前記第1電気信号及び前記第2電気信号を差動型のトランスインピーダンス回路に入力する、光信号処理方法。 - 外部から受信した受信光信号とローカル光信号とを第1の位相差で干渉させて第1光信号を生成する第1光信号生成手段と、
前記受信光信号と前記ローカル光信号とを、前記第1の位相差からπずれた第2の位相差で干渉させて第2光信号を生成する第2光信号生成手段と、
前記第1光信号を第1電気信号に変換する第1光電変換素子と、
前記第2光信号を第2電気信号に変換する第2光電変換素子と、
前記第1電気信号の直流成分、及び前記第2電気信号の直流成分を小さくする直流成分補正手段と、
前記直流成分補正手段が補正した後の前記第1電気信号及び前記第2電気信号が入力される差動型のトランスインピーダンス回路と、
を備える光信号処理装置。 - 外部から受信した受信光信号とローカル光信号とを、第1の条件で干渉させることにより第1デジタル信号を生成する第1光信号処理手段と、
前記受信光信号と前記ローカル光信号とを、第2の条件で干渉させることにより第2デジタル信号を生成する第2光信号処理手段と、
前記第1デジタル信号及び前記第2デジタル信号を処理して前記受信光信号に含まれる信号を取り出すデジタル処理手段と、
を備え、
前記第1光信号処理手段は、
前記受信光信号と前記ローカル光信号とを同相で干渉させて第1光信号を生成する第1光信号生成手段と、
前記受信光信号と前記ローカル光信号とを位相差πで干渉させて第2光信号を生成する第2光信号生成手段と、
前記第1光信号を第1電気信号に変換する第1光電変換素子と、
前記第2光信号を第2電気信号に変換する第2光電変換素子と、
前記第1電気信号の直流成分を小さくするとともに、前記第2電気信号の直流成分を小さくする第1直流成分補正手段と、
前記直流成分補正手段が補正した後の前記第1電気信号及び前記第2電気信号が入力される差動型の第1トランスインピーダンスアンプと、
前記第1トランスインピーダンスアンプの出力を前記第1デジタル信号に変換する第1AD変換手段と、
を有し、
前記第2光信号処理手段は、
前記受信光信号と前記ローカル光信号とを位相差π/2で干渉させて第3光信号を生成する第3光信号生成手段と、
前記受信光信号と前記ローカル光信号とを位相差3π/2で干渉させて第4光信号を生成する第4光信号生成手段と、
前記第3光信号を第3電気信号に変換する第3光電変換素子と、
前記第4光信号を第4電気信号に変換する第4光電変換素子と、
前記第3電気信号の直流成分を小さくするとともに、前記第4電気信号の直流成分を小さくする第2直流成分補正手段と、
前記直流成分補正手段が補正した後の前記第3電気信号及び前記第4電気信号が入力される差動型の第2トランスインピーダンスアンプと、
前記第2トランスインピーダンスアンプの出力を前記第2デジタル信号に変換する第2AD変換手段と、
を有する光信号処理装置。
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