WO2015159528A1 - Dispositif d'émission optique et procédé de commande de tension d'alimentation électrique - Google Patents

Dispositif d'émission optique et procédé de commande de tension d'alimentation électrique Download PDF

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Publication number
WO2015159528A1
WO2015159528A1 PCT/JP2015/002026 JP2015002026W WO2015159528A1 WO 2015159528 A1 WO2015159528 A1 WO 2015159528A1 JP 2015002026 W JP2015002026 W JP 2015002026W WO 2015159528 A1 WO2015159528 A1 WO 2015159528A1
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Prior art keywords
power supply
voltage
bias voltage
light
bias
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PCT/JP2015/002026
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English (en)
Japanese (ja)
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山本　浩史
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日本電気株式会社
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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
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
    • G02F1/0123—Circuits for the control or stabilisation of the bias voltage, e.g. automatic bias control [ABC] feedback loops
    • 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
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H04B10/505—Laser transmitters using external modulation
    • H04B10/5057—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output
    • H04B10/50575—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output to control the modulator DC bias

Definitions

  • the present invention relates to an external optical modulation type optical transmission apparatus and a power supply voltage control method thereof.
  • Recent optical transmitters for example, digital coherent optical transmitters, often employ an external optical modulation method.
  • the external light modulation method is a method in which light from a light source (for example, a laser light source) is modulated by an optical modulator.
  • an optical modulator In an optical transmitter of an external light modulation system, as an optical modulator, a modulator using an electro-optic effect by a dielectric material such as LiNbO 3 (lithium niobate: abbreviation LN), or a semiconductor such as InP (indium phosphide) A modulator using an electroabsorption effect of a material is used.
  • a device using LiNbO 3 is called an LN modulator
  • a device using InP is called an InP modulator.
  • the LN modulator can perform high-speed modulation.
  • a drift phenomenon is known in which the operating point of the LN modulator changes due to a temperature change or a change with time.
  • a phenomenon caused by a pyroelectric effect caused by a temperature change is called a thermal (temperature) drift, and a thing caused by a change with time is called a DC drift.
  • FIG. 4 shows a configuration of an optical transmission apparatus that performs feedback control.
  • the optical transmission apparatus includes a light source 101, an optical modulator 102, an RF (Radio Frequency) drive circuit 103, a power supply circuit 104, a bias supply circuit 105, a light detection unit 106, and a control unit 100.
  • RF Radio Frequency
  • the light source 101 is a laser light source and outputs laser light according to the control signal S1.
  • the optical modulator 102 is an LN phase modulator. In the LN phase modulator, one optical waveguide is formed on an LN substrate, and an RF driving electrode and a bias adjusting electrode are formed in the vicinity of the optical waveguide.
  • the light detection unit 106 detects the light intensity of the output light (monitor light) of the light modulator 102, and outputs an electric signal corresponding to the magnitude of the light intensity to the control unit 100 as a monitor light detection signal S3.
  • the RF drive circuit 103 converts a digital signal corresponding to the input information into an analog drive signal and supplies the analog drive signal to the optical modulator 102. Specifically, the RF drive circuit 103 converts an RF electric signal (high frequency signal) that is an input modulation signal (digital signal) into an analog signal, and supplies the drive signal to the optical modulator 102. .
  • the power supply circuit 104 supplies a power supply voltage to the bias supply circuit 105.
  • the bias supply circuit 105 operates by receiving the power supply voltage from the power supply circuit 104 and supplies the bias voltage V B to the optical modulator 102 in accordance with the drive control signal S2.
  • the control unit 100 supplies the control signal S1 to the light source 101 and supplies the drive control signal S2 to the bias supply circuit 105.
  • the control unit 100 controls the bias supply circuit 105 so that the bias voltage V B becomes a voltage value (optimum value) that is the operating point of the optical modulator 102 based on the monitor light detection signal S 3 from the light detection unit 106.
  • (ABC control: Auto Bias Control) As an ABC operation at the time of phase modulation, for example, the control unit 100 inserts a pilot signal into the drive control signal S2 and extracts a pilot signal inserted from the monitor light detection signal S3 input from the light detection unit 106. Then, the inserted pilot signal and the extracted pilot signal are synchronously detected, and the bias supply circuit 105 is controlled so that the synchronous detection signal becomes 0V. Details of ABC operation during phase modulation are disclosed in, for example, Patent Documents 1 and 2.
  • FIG. 5 is a diagram for explaining a modulation curve and an operating point of the optical modulator 102.
  • the modulation curve of the optical modulator 102 is shown in a two-dimensional coordinate system in which the vertical axis represents the light intensity and the horizontal axis represents the bias voltage value.
  • the modulation curve of the optical modulator 102 is a COS square function curve, and the operating point of the optical modulator 102 is set on this modulation curve.
  • the operating point of the optical modulator 102 is appropriately set according to the modulation method.
  • the minimum point on the modulation curve is set as an operating point (a point indicated by a circle).
  • the optical modulator 102 performs phase modulation based on the drive signal from the RF drive circuit 103 with the operating point as a reference. Specifically, when the RF electric signal is “0”, the driving voltage V 1 is supplied to the RF driving electrode, and when the RF electric signal is “1”, the driving voltage V 2 is for RF driving. Supplied to the electrode.
  • each of the drive voltages V 1 and V 2 is a voltage value based on the operating point, and is set to a voltage value at a maximum point located on the left and right of the operating point on the modulation curve.
  • the drive voltage V 1 is ⁇ V ⁇
  • the drive voltage V 2 is + V ⁇ .
  • V ⁇ is a half-wave voltage that changes the phase of light propagating in the waveguide by a half wavelength. For example, a phase change amount of 2 ⁇ occurs between the phase of light when the drive voltage V 1 ( ⁇ V ⁇ ) is supplied and the phase of light when the drive voltage V 2 (+ V ⁇ ) is supplied.
  • the operating point of the optical modulator 102 drifts (changes) over time.
  • a curve indicated by a solid line is a modulation curve when the power is turned on, and the voltage value at the operating point A is V B 1.
  • the control unit 100 controls the bias supply circuit 105 so that the bias voltage V B becomes the voltage value V B 1.
  • the optical modulator 102 performs phase modulation based on the drive signal from the RF drive circuit 103 with the operating point A as a reference.
  • a curve indicated by a broken line is a modulation curve after a certain time has elapsed since the power was turned on, and the voltage value V B 2 at the operating point B is different from the voltage V B 1 at the operating point A. That is, the voltage value of the operating point is shifted from V B 1 to V B 2.
  • V B bias voltage
  • the control unit 100 changes the bias voltage V B so that the synchronous detection signal becomes 0V.
  • the bias voltage V B is set to the optimum voltage value V B 2, and as a result, the optical modulator 102 uses the operating point B as a reference and the phase based on the drive signal from the RF drive circuit 103. Modulation is performed.
  • the power supply circuit 104 outputs a fixed power supply voltage of 50 V so that the upper limit value of the bias voltage specification of the optical modulator 102 can be covered.
  • Patent Documents 3-7 techniques relating to bias voltage control of an optical transmitter of an external modulation type are described in Patent Documents 3-7 and the like in addition to Patent Documents 1 and 2 described above.
  • Patent Document 1 describes an optical transmission device including a Mach-Zehnder type LN modulator.
  • a Mach-Zehnder LN modulator is driven by a drive signal on which a low-frequency dither signal is superimposed. Then, based on the phase comparison result between the dither signal extracted from the output signal of the Mach-Zehnder LN modulator and the dither signal before superposition, a bias voltage for compensating for the operating point drift of the Mach-Zehnder LN modulator is generated.
  • Patent Document 2 describes feedback control in which output light (monitor light) of a Mach-Zehnder LN modulator is detected by a photodetector and a bias voltage is controlled based on the output value of the photodetector.
  • Patent Document 3 discloses that training is performed to calculate an intermediate point from the minimum and maximum values of the operating point bias set value, and the calculated intermediate value is set as an appropriate operating point of the external modulator. Has been.
  • the power supply circuit 104 outputs a voltage (V max in FIG. 5) that can cover the upper limit value of the bias voltage specification of the optical modulator 102.
  • V max the voltage
  • the power supply circuit 104 always supplies a power supply voltage of 50 V to the bias supply circuit 105. In this case, the following problems occur.
  • the optical modulator shown in FIG. A power supply voltage V max that can cover the upper limit value of the bias voltage specification 102 is supplied to the bias supply circuit 105. That is, in the optical transmission device shown in FIG. 4, a power supply voltage larger than necessary with respect to the bias voltage supplied to the optical modulator 102 is supplied to the bias supply circuit 105. For this reason, the problem that power consumption increases arises.
  • optical transmission devices described in Patent Documents 1-3 also have the above-described problem of increased power consumption because the power supply voltage is fixed.
  • An object of the present invention is to provide an optical transmission apparatus and a power supply voltage control method thereof that can solve the above-described problems and can reduce power consumption.
  • an optical transmission apparatus receives light output means for outputting light, a drive signal and a bias voltage as inputs, and modulates light from the light output means according to the drive signal.
  • a light modulation means for changing the intensity of the output light in accordance with the bias voltage, and a feedback indicating a deviation amount of the bias voltage with respect to an operating point of the light modulation means set to a predetermined value based on the intensity of the output light.
  • Feedback means for generating information; power supply means for outputting a power supply voltage; bias supply means that operates in response to the power supply voltage and supplies the bias voltage to the light modulation means; and the bias of the bias supply means Control means for controlling the supply operation of the voltage and the output operation of the power supply voltage of the power supply means. Based on Dobakku information, along with changing the bias voltage, to vary the power supply voltage according to the value of the bias voltage.
  • a power supply voltage control method receives a drive signal and a bias voltage as input, modulates light from a light source according to the drive signal, and outputs light intensity according to the bias voltage.
  • a power supply voltage control method for an optical transmission device comprising: an optical modulator that changes, and a bias supply circuit that operates by receiving a power supply voltage and supplies the bias voltage to the optical modulator, The bias voltage is changed based on feedback information indicating a deviation amount of the bias voltage with respect to the operating point of the optical modulator that is generated based on the intensity and is set to a predetermined value, and according to the value of the bias voltage The power supply voltage is changed.
  • the power consumption can be reduced.
  • FIG. 2 is a diagram for explaining a relationship among an operating point drift, a bias voltage, and a power supply voltage when the optical modulator of the optical transmission device shown in FIG. 1 is turned on.
  • FIG. 2 is a diagram for explaining a relationship between an operating point drift, a bias voltage, and a power supply voltage when a certain time has elapsed after the optical modulator of the optical transmission device shown in FIG. 1 is turned on.
  • FIG. 2 is a diagram for explaining an optimum value of a bias voltage and a change in power supply voltage in the optical transmission device shown in FIG. 1.
  • FIG. 5 is a diagram for explaining a modulation curve and an operating point of an optical modulator of the optical transmission device shown in FIG. 4.
  • FIG. 1 is a block diagram showing a configuration of an optical transmission apparatus according to an embodiment of the present invention.
  • the optical transmission apparatus includes a light source 1, an optical modulator 2, an RF drive circuit 3, a power supply circuit 4, a bias supply circuit 5, a light detection unit 6, and a control unit 10.
  • the light source 1, the RF drive circuit 3, and the bias supply circuit 5 are the same as the light source 101, the RF drive circuit 103, and the bias supply circuit 105 shown in FIG. That is, the light source 1 outputs laser light according to the control signal S1 input from the control unit 10.
  • the RF drive circuit 3 converts a digital signal corresponding to the input information into an analog drive signal and supplies the analog drive signal to the optical modulator 2.
  • Bias supply circuit 5 operates receiving the power supply voltage from the power supply circuit 4 supplies a bias voltage V B to the optical modulator 2 according to the driving control signal S2.
  • the light modulator 2 is an LN modulator and modulates light from the light source 1.
  • LN modulators include modulation schemes such as intensity modulation, phase modulation, and polarization modulation, and the optical modulator 2 can employ any modulation scheme.
  • an LN phase modulator is used as the optical modulator 2.
  • one optical waveguide is formed on an LN substrate, and an RF driving electrode and a bias adjusting electrode are formed in the vicinity of the optical waveguide.
  • Light from the light source 1 enters from one end of the optical waveguide.
  • the incident light propagates in the optical waveguide and is emitted from the other end of the optical waveguide.
  • a phase change corresponding to the drive voltage supplied to the RF drive electrode is caused to the light propagating in the optical waveguide.
  • the light detection unit 6 detects the output light of the light modulator 2 and includes, for example, a PD (photodiode).
  • the output light of the optical modulator 2 is branched into two using a Y-branch waveguide or a 3 dB directional coupler, and one of the branched lights is supplied to the PD as monitor light.
  • the PD supplies an electrical signal corresponding to the light intensity of the input monitor light to the control unit 10 as a monitor light detection signal S3. Note that the light detection unit 6 may be incorporated in the light modulator 2.
  • the power supply circuit 4 supplies a power supply voltage to the bias supply circuit 5, and is configured to increase or decrease the power supply voltage according to the power supply control signal S4.
  • a power supply circuit 4 with a variable power supply voltage can be constituted by, for example, a DC-DC converter with a variable output voltage.
  • the control unit 10 supplies the control signal S 1 to the light source 1, supplies the drive control signal S 2 to the bias supply circuit 5, and supplies the power control signal S 4 to the power circuit 4.
  • the control unit 10 performs ABC control based on the monitor light detection signal S 3 from the light detection unit 6 so that the bias voltage V B becomes the voltage value of the operating point of the optical modulator 2.
  • the control unit 10 according to the present embodiment further performs power supply voltage control so that a necessary minimum power supply voltage corresponding to the determined voltage value is supplied to the bias supply circuit 5.
  • control unit 10 inserts a pilot signal into the drive control signal S2 and extracts the inserted pilot signal from the monitor light detection signal S3 input from the light detection unit 6. Then, the inserted pilot signal and the extracted pilot signal are synchronously detected, and the bias supply circuit 5 is controlled so that the synchronous detection signal becomes 0V.
  • the power supply voltage supplied to the bias supply circuit 5 is adjusted to the voltage value at the operating point if a voltage (for example, V B + ⁇ ) that is slightly larger than the voltage value at the operating point of the optical modulator 2 can be supplied. I can do it.
  • the application of the RF signal from the RF drive circuit 3 is performed by AC (Alternating Current) coupling from the outside, so that it is not necessary to apply a bias voltage considering the AC amplitude.
  • 2A and 2B are diagrams for explaining the relationship between the operating point drift of the optical modulator 2, the optimum value of the bias voltage, and the minimum required power supply voltage.
  • 2A shows the time when the power is turned on
  • FIG. 2B shows the time when a certain time has passed after the power is turned on.
  • the modulation curve of the optical modulator 2 is shown in a two-dimensional coordinate system in which the vertical axis represents the light intensity and the horizontal axis represents the bias voltage value.
  • the modulation curve at power-on is shown by a broken line.
  • the upper limit value of the bias voltage specification of the optical modulator 2 is V max .
  • the modulation curve of the optical modulator 2 is a COS square function curve, and the operating point of the optical modulator 2 is set on this modulation curve.
  • the operating point of the optical modulator 2 is appropriately set according to the modulation method.
  • the minimum point on the modulation curve is set as an operating point (a point indicated by a circle).
  • phase modulation based on the drive signal from the RF drive circuit 3 is performed with the operating point as a reference. Specifically, when the RF electric signal is “0”, the driving voltage V 1 is supplied to the RF driving electrode, and when the RF electric signal is “1”, the driving voltage V 2 is for RF driving. Supplied to the electrode.
  • each of the drive voltages V 1 and V 2 is a voltage value based on the operating point, and is set to a voltage value at a maximum point located on the left and right of the operating point on the modulation curve.
  • the drive voltage V 1 is ⁇ V ⁇
  • the drive voltage V 2 is + V ⁇ .
  • V ⁇ is a half-wave voltage that changes the phase of light propagating in the waveguide by a half wavelength. For example, a phase change amount of 2 ⁇ occurs between the phase of light when the drive voltage V 1 ( ⁇ V ⁇ ) is supplied and the phase of light when the drive voltage V 2 (+ V ⁇ ) is supplied.
  • the voltage value of the operating point of the optical modulator 2 (the operating point A in FIG. 2A) is V B 1.
  • the controller 10 controls the bias supply circuit 5 so that the bias voltage V B becomes the voltage value V B 1, and at the same time controls the power supply circuit 4 so that the power supply voltage V 0 becomes the voltage value V min 1.
  • the bias supply circuit 5 can secure a necessary voltage control range, and the optical modulator 2 performs phase modulation based on the drive signal from the RF drive circuit 3 with the operating point A as a reference.
  • the power supply voltage is lower by [V max ⁇ V min 1], so that the power consumption by the bias supply circuit 5 can be reduced.
  • the operating point of the optical modulator 2 changes from the operating point A to the operating point B over time.
  • the voltage value at the operating point B is V B 2 (> V B 1).
  • the control unit 10 controls the power supply circuit 4 so that the power supply voltage V 0 becomes the voltage value V min 2 at the same time as controlling the bias supply circuit 5 so that the bias voltage V B becomes the voltage value V B 2.
  • the bias supply circuit 5 can secure a necessary voltage control range, and the optical modulator 2 performs phase modulation based on the drive signal from the RF drive circuit 3 with the operating point B as a reference.
  • the power supply voltage is lower by [V max ⁇ V min 2], so that the power consumption by the bias supply circuit 5 can be reduced.
  • FIG. 3 is a diagram for explaining the change in the optimum value (voltage at the operating point) of the bias voltage and the change in the power supply voltage supplied to the bias supply circuit 5.
  • the vertical axis represents the bias voltage, and the horizontal axis represents time.
  • a graph G1 shows a change in the optimum value (voltage at the operating point) of the bias voltage.
  • a graph G2 shows a change in the power supply voltage.
  • a hatched area S indicates a reduction amount of the power supply voltage. As the power supply voltage reduction amount increases, the power consumption reduction amount increases.
  • the bias voltage V B gradually increases as the operating point changes.
  • the power supply voltage V 0 gradually increases as the bias voltage V B changes.
  • the difference between the bias voltage V B and the power supply voltage V 0 corresponds to the above “ ⁇ ”.
  • the power consumption reduction effect is greatest when the power is turned on, and then gradually decreases with time.
  • a method of gradually increasing the power supply voltage at a fixed rate is also conceivable.
  • the speed of the operating point drift of the optical modulator 2 is not constant, and varies depending on the operating conditions and the characteristics (inherent characteristics) of the optical modulator 2, so that the bias voltage V B is set to an optimum value.
  • the power supply voltage necessary for this cannot be obtained.
  • the bias voltage V B can be maintained at an optimum value even when the operating point of the optical modulator 2 fluctuates. There is no problem of distortion.
  • the bias supply circuit 5 is operated at a power supply voltage (minimum required power supply voltage) slightly higher than the voltage value at the operating point of the optical modulator 2, power consumption can be reduced.
  • a power supply voltage minimum required power supply voltage
  • the drive voltage based on the RF electrical signal is applied by AC coupling, it is not necessary to apply the bias voltage in consideration of the AC amplitude.
  • the power consumption can be reduced to half or less as compared with the specification considering long-term reliability.
  • the specification with consideration for long-term reliability needs to set the power supply voltage to 50 V, whereas in this embodiment, the operating point is If it is about 10V, the power supply voltage of the bias supply circuit 5 may be about 12V (about 1/4). That is, when the power supply voltage can be lowered by about 38 V and the power consumption can be considered to be proportional to the power supply voltage, the power consumption can be reduced to about 1 ⁇ 4.
  • the operating point may drift once in the minus direction and then drift in the plus direction.
  • the bias voltage V B is changed according to the monitor light detection signal S3, and the power supply voltage V 0 is changed according to the change of the bias voltage V B. For this reason, even if the operating point moves in either the plus direction or the minus direction, it is possible to follow the bias voltage V B and the power supply voltage V 0 .
  • the optical modulator 2 is not limited to the LN phase modulator.
  • the optical modulator 2 may be an LN intensity modulator.
  • an optical transmission device in which the optical modulator 2 is configured by an LN intensity modulator will be described.
  • the LN intensity modulator is formed with first and second optical waveguides constituting a Mach-Zehnder interferometer on an LN substrate, and in addition to the first and second optical waveguides, an RF driving electrode In addition, a bias adjusting electrode is formed.
  • One end of the first and second optical waveguides is coupled to the first Y branch waveguide, and the other end is coupled to the second Y branch waveguide.
  • Light from the light source 1 is supplied to the first and second optical waveguides via the first Y branch waveguide.
  • the light propagated through each of the first and second optical waveguides is multiplexed by the second Y branch waveguide.
  • the light detection unit 6 detects a part of the output light output through the second Y-branch waveguide as monitor light.
  • the operating point of the optical modulator 2 is set between the maximum point and the minimum point of the modulation curve shown in FIG. 2A and the like.
  • the drive voltage V 1 when the RF electrical signal is “0” is a minimum voltage value
  • the drive voltage V 2 when the RF electrical signal is “1” is a maximum voltage value.
  • the drive voltage V 1 is supplied, there is no phase difference between the lights propagated through the respective first and second optical waveguides.
  • the second Y-branch waveguide the light from the first optical waveguide and the light from the second optical waveguide are combined without canceling each other and output from the optical modulator 2.
  • the phase difference of 180 ° between light propagating in the respective first and second optical waveguides is produced.
  • the light from the first optical waveguide and the light from the second optical waveguide cancel each other, so that no light is output from the optical modulator 2.
  • the control unit 10 determines that the bias voltage V B becomes the voltage value of the operating point of the optical modulator 2 based on the monitor light detection signal S3 from the light detection unit 6. Thus, the bias voltage control is performed, and the power supply voltage control for performing the bias voltage supply operation with the minimum necessary power supply voltage is performed.
  • the control unit 10 inserts a pilot signal into the drive control signal S2 and the pilot signal inserted from the monitor light detection signal S3 input from the light detection unit 6 at the time of intensity modulation as well as at the time of phase modulation. Extract. Then, the inserted pilot signal and the extracted pilot signal are synchronously detected, and the bias supply circuit 5 is controlled so that the synchronous detection signal becomes 0V. Thereby, there exists an effect
  • the optical modulator 2 may be formed using a material other than LN, for example, a material having an electro-optic effect such as LiTaO 3 or KTiOPO 4 .
  • a DP-QPSK (Dual Polarization / Quadrature / Phase / Shift / Keying) modulation system that assigns 4-bit data to the optical modulator 2 may be employed.
  • the effect of reducing power consumption is further increased.
  • ABC control may be obtained by any method as long as the operating point of the optical modulator can be stabilized.
  • training is performed to calculate the intermediate point from the minimum and maximum values of the operating point bias set value, and the calculated intermediate value is used as an appropriate operation of the external modulator. It can also be a point.
  • the light source, the optical modulator, the feedback unit, the power supply circuit, the bias supply circuit, and the control unit are the light source 1, the optical modulator 2, the light detection unit 6, the power supply circuit 4, and the bias shown in FIG. It may be configured by the supply circuit 5 and the control unit 10.
  • [Appendix 1] A light source; An optical modulator that takes a drive signal and a bias voltage as inputs, modulates light from the light source according to the drive signal, and changes the intensity of output light according to the bias voltage; A feedback unit that outputs feedback information indicating a deviation amount of the bias voltage with respect to an operating point of the optical modulator in which the intensity of the output light is set to a predetermined value; A power supply circuit that outputs a power supply voltage; A bias supply circuit that operates by receiving the power supply voltage and supplies the bias voltage to the optical modulator; A control unit for controlling the supply operation of the bias voltage of the bias supply circuit and the output operation of the power supply voltage of the power supply circuit, The said control part is an optical transmission apparatus which changes the said power supply voltage according to the value of this bias voltage while changing the said bias voltage based on the said feedback information.
  • Appendix 2 The optical transmitter according to appendix 1, wherein a difference between the power supply voltage and the bias voltage is constant.
  • Appendix 3 The optical transmission device according to appendix 1 or 2, wherein the power supply circuit includes a DC-DC converter having a variable output voltage.
  • the feedback unit includes a light detection unit that detects the intensity of the output light and supplies the detection value to the control unit as the feedback information.
  • the control unit superimposes a predetermined pilot signal on the bias voltage, and changes the bias voltage so that a synchronous detection result between the pilot signal extracted from the detection value and the pilot signal becomes 0. 4.
  • the optical transmission device according to any one of 3.
  • Appendix 5 The optical transmission device according to appendix 4, wherein the light detection unit is incorporated in the optical modulator.
  • optical transmitter The optical transmitter according to any one of appendices 1 to 5, wherein the optical modulator is made of lithium niobate.
  • the driving signal and the bias voltage are input, respectively, and the light from the light source is modulated according to the driving signal, and the optical modulator that changes the intensity of the output light in accordance with the bias voltage, operates in response to the power supply voltage, and
  • a power supply voltage control method for an optical transmission device comprising a bias supply circuit for supplying a bias voltage to the optical modulator, Based on feedback information indicating the amount of deviation of the bias voltage with respect to the operating point of the optical modulator where the intensity of the output light is a predetermined value, the bias voltage is changed, and according to the value of the bias voltage, A power supply voltage control method for changing the power supply voltage.
  • the present invention can be applied to all optical modulators in which bias voltage control is performed.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
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Abstract

La présente invention porte sur un dispositif d'émission optique pouvant atteindre une réduction de consommation d'énergie. Le dispositif d'émission optique comprend : une source lumineuse ; un modulateur optique destiné à moduler une lumière provenant de la source lumineuse ; une unité de rétroaction destinée à délivrer en sortie des informations de rétroaction représentant l'écart d'une tension de polarisation depuis le point de fonctionnement du modulateur optique ; un circuit d'alimentation électrique destiné à délivrer en sortie une tension d'alimentation électrique ; un circuit d'alimentation de polarisation fonctionnant en réponse à la tension d'alimentation électrique pour alimenter le modulateur optique avec une tension de polarisation ; et une unité de commande destinée à commander l'opération alimentant la tension de polarisation depuis le circuit d'alimentation de polarisation et l'opération délivrant en sortie la tension d'alimentation électrique depuis le circuit d'alimentation électrique. L'unité de commande change la tension de polarisation sur la base des informations de rétroaction, tout en changeant la tension d'alimentation électrique en fonction de la valeur de la tension de polarisation.
PCT/JP2015/002026 2014-04-17 2015-04-10 Dispositif d'émission optique et procédé de commande de tension d'alimentation électrique WO2015159528A1 (fr)

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JP2014085223A JP2017125867A (ja) 2014-04-17 2014-04-17 光送信装置及び電源電圧制御方法
JP2014-085223 2014-04-17

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Cited By (1)

* Cited by examiner, † Cited by third party
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US11073706B2 (en) 2016-07-15 2021-07-27 Nec Corporation Transmitter and bias adjustment method

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JPH11213426A (ja) * 1998-01-27 1999-08-06 Hitachi Ltd 光ディスク装置
JP2003168232A (ja) * 2001-11-29 2003-06-13 Toshiba Corp 光ディスクドライブ及びレーザ光駆動電源電圧制御方法
JP2004037647A (ja) * 2002-07-01 2004-02-05 Mitsubishi Electric Corp 光送信装置
JP2004287330A (ja) * 2003-03-25 2004-10-14 Anritsu Corp 光変調装置

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Publication number Priority date Publication date Assignee Title
JPH11213426A (ja) * 1998-01-27 1999-08-06 Hitachi Ltd 光ディスク装置
JP2003168232A (ja) * 2001-11-29 2003-06-13 Toshiba Corp 光ディスクドライブ及びレーザ光駆動電源電圧制御方法
JP2004037647A (ja) * 2002-07-01 2004-02-05 Mitsubishi Electric Corp 光送信装置
JP2004287330A (ja) * 2003-03-25 2004-10-14 Anritsu Corp 光変調装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11073706B2 (en) 2016-07-15 2021-07-27 Nec Corporation Transmitter and bias adjustment method

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