WO2014034047A1 - 光送信機、バイアス電圧制御方法 - Google Patents
光送信機、バイアス電圧制御方法 Download PDFInfo
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- WO2014034047A1 WO2014034047A1 PCT/JP2013/004929 JP2013004929W WO2014034047A1 WO 2014034047 A1 WO2014034047 A1 WO 2014034047A1 JP 2013004929 W JP2013004929 W JP 2013004929W WO 2014034047 A1 WO2014034047 A1 WO 2014034047A1
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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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5053—Laser transmitters using external modulation using a parallel, i.e. shunt, combination of modulators
-
- 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
- H04B10/564—Power control
-
- 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
-
- 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
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
Definitions
- the present invention relates to an optical transmitter, and more particularly to bias voltage control of an optical transmitter.
- QPSK Quadrature Phase Shift Keying
- IQ modulator a 2-parallel MZ modulator composed of two Mach-Zehnder (MZ) modulators
- MZ modulator as an MZ interferometer
- I channel or I arm an in-phase component In-phase channel
- quadrature-phase channel that is a quadrature component.
- Each modulation signal (Q channel or Q-arm) is combined with a carrier phase difference of 90 degrees.
- This type of optical modulator applies intensity modulation to continuous light having a constant intensity.
- bias bias voltage or current
- signal signal voltage or current
- These signal power and bias power have appropriate values for the output optical modulation signal to be an optical modulation signal that is linear with respect to the digital input signal and has no distortion.
- this MZ modulator is affected by environmental temperature and time fluctuation, the optimum bias voltage changes. Therefore, in order to stabilize the signal quality, it is important to control the bias of the optical modulator with high accuracy.
- Patent Document 1 describes the basic principle of operation of ABC control (Auto Bias Control) during intensity modulation. However, it does not mention the convergence time to the control point.
- Patent Document 2 describes the basic principle of ABC operation during intensity modulation. It also describes the basic principle of ABC operation during normal operation (after convergence to the control point). However, it does not mention the convergence time. Furthermore, the V ⁇ characteristic of the modulator is scanned for one cycle, the maximum / minimum value is searched, and the control point is obtained. However, according to this method, at the time of phase modulation, about 10 to 20 V scan is performed at 2 V ⁇ , and it takes too much time until the ABC convergence time.
- Patent Document 3 describes the basic principle of ABC operation during phase modulation. This document also does not describe the convergence time.
- Patent Document 4 describes a basic configuration example of ABC operation during phase modulation. However, there is no description regarding the convergence time.
- Patent Document 5 describes a technique for direct modulation. This document also has no description regarding the convergence time. As described above, Patent Documents 1 to 5 do not present any solution for shortening the control stabilization time of the modulator bias voltage when the optical transmitter is activated.
- the present invention has been made to solve such a problem, and an optical transmitter and a bias voltage control method capable of shortening the bias voltage control stabilization time of a modulator at the time of starting the optical transmitter.
- the purpose is to provide.
- the optical transmitter includes: an optical modulation unit that modulates an optical signal to generate an optical modulation signal; a bias voltage output unit that supplies a bias voltage on which a pilot signal is superimposed to the optical modulation unit; Pilot signal receiving means for extracting a pilot signal component corresponding to the pilot signal by photoelectrically converting the modulation signal, and bias voltage control means are provided.
- the bias voltage control means includes training means for determining a control start voltage and a control direction of the bias voltage based on the pilot signal component in the first and second bias voltage values, the control start voltage, and the control voltage.
- the pilot signal component is analyzed while gradually adjusting the bias voltage along the control direction from the control start voltage, thereby compensating for the deviation of the operating point of the light modulation means.
- the first voltage step between the first and second bias voltage values is configured to be set larger than the second voltage step in the stepwise adjustment of the bias voltage in the feedback means.
- the bias voltage control method in the optical transmitter includes: optical modulation that generates an optical modulation signal by modulating an optical signal; and a bias voltage on which a pilot signal is superimposed is supplied during the optical modulation. Outputting a bias voltage.
- the method includes photoelectrically converting the optical modulation signal to receive a pilot signal for extracting a pilot signal component corresponding to the pilot signal, and controlling a bias voltage.
- the bias voltage control includes a training process for determining a control start voltage and a control direction of the bias voltage based on the pilot signal component in the first and second bias voltage values, the control start voltage, and the control voltage.
- the shift of the operating point in the optical modulation is reduced. Feedback to determine the proper bias voltage to compensate.
- the first voltage step between the first and second bias voltage values may be larger than the second voltage step in the stepwise adjustment of the bias voltage during the feedback.
- FIG. 5 is a pattern diagram in which the amplitude value, phase, and voltage of a pilot signal according to the present embodiment are varied.
- FIG. 5 is a pattern diagram in which the amplitude value, phase, and voltage of a pilot signal according to the present embodiment are varied.
- FIG. 5 is a pattern diagram in which the amplitude value, phase, and voltage of a pilot signal according to the present embodiment are varied.
- FIG. 5 is a pattern diagram in which the amplitude value, phase, and voltage of a pilot signal according to the present embodiment are varied. It is a figure of the evaluation result of the change of the pilot signal amplitude with respect to the bias voltage which concerns on this embodiment. It is a comparison figure of control stabilization time concerning this embodiment. It is a comparison figure of control stabilization time concerning this embodiment. It is the figure which showed the influence on the optical waveform of the gain strength of the feedback system which concerns on this embodiment. It is the figure which showed the influence on the optical waveform of the gain strength of the feedback system which concerns on this embodiment.
- bias voltage control It is a flowchart figure of bias voltage control concerning this embodiment. It is a flowchart figure of bias voltage control concerning this embodiment. It is a flowchart figure of bias voltage control concerning this embodiment. It is a flowchart figure of bias voltage control concerning this embodiment. It is a flowchart figure of bias voltage control concerning this embodiment. It is a block diagram of the system which concerns on this embodiment. It is a figure of training processing and bias voltage control concerning this embodiment. It is a figure of training processing and bias voltage control concerning this embodiment.
- an optical transmitter 100 includes a light source 1, a QPSK (Quadrature Phase Shift Keying) modulator 2, a DATA Driver 3, a bias output circuit 4, a pilot signal demodulation circuit 5, and a system 6.
- the system 6 includes a feedback unit 61 and a training unit 62 (FIG. 10).
- FIG. 2 is a diagram showing the inside of the modulator 2 in the optical transmitter shown in FIG.
- the optical modulation signal is photoelectrically converted using a photodiode (PD) 7 inside the modulator, and the pilot signal component included in the optical modulation signal is monitored to observe the amount of deviation from the optimum bias voltage of the modulator. be able to.
- PD photodiode
- FIG. 3 shows the V ⁇ curve characteristics in the I arm and Q arm of the QPSK modulator.
- the vertical axis represents the light output intensity
- the horizontal axis represents the modulator applied voltage (bias voltage).
- bias voltage As the applied voltage changes, the light output intensity also changes.
- a low frequency pilot signal is superimposed on the bias voltage of each of the I arm and Q arm (bias output circuit 4), and the demodulated pilot signal is taken out from the PD 7 of the modulator ( The signal is transmitted to the pilot signal demodulation circuit 5) and the system 6, and the feedback unit 61 feeds back to the bias output circuit 4.
- This method is generally called ABC control (Auto Bias Control).
- ABC control Auto Bias Control
- the amplitude of the demodulated pilot signal varies depending on the bias voltage when the pilot signal is superimposed. This is shown in FIG. When the bias voltage is adjusted so that the light output intensity becomes maximum (PEAK point), the amplitude of the pilot signal is minimum.
- the pilot signal amplitude is maximum when the bias voltage is adjusted so that the light output intensity is reduced to half from the maximum (QUADRATURE point). Even when the bias voltage is adjusted to the NULL point where the light output intensity is minimum, the amplitude of the pilot signal is minimum.
- the phase of the pilot signal in each slope of the V ⁇ curve symmetric about the NULL point is inverted by 180 degrees. Therefore, the change in the bias voltage, the amplitude of the pilot signal, and the change in the phase of the pilot signal are linked with the V ⁇ curve. By monitoring the change of the pilot signal, it is possible to perform feedback control for locking to the NULL point.
- the bias voltage setting procedure in this embodiment includes training 80 and subsequent feedback control 81.
- the control start voltage (start voltage) and the control direction of the bias voltage are determined.
- the control start voltage of the bias voltage means an initial value of the bias voltage value when starting normal feedback control 81 for compensating for the deviation of the operating point of the modulator 2.
- the control direction of the bias voltage means a direction in which the bias voltage is changed when starting the normal feedback control 81 (that is, a direction in which the bias voltage increases or decreases).
- the pilot signal amplitude becomes zero at two points, the NULL point and the PEAK point (FIG. 4C), but control is performed so as to converge to the NULL point which is the optimum bias point.
- the stage of the training process 80 performed by the training unit 62 will be described.
- the amplitude and phase of the pilot signal at the start bias voltage value (first point), and the second bias different from the first bias voltage value Monitor the amplitude and phase of the pilot signal at voltage values and compare them.
- the amplitude and phase of the pilot signal at the first bias voltage and the amplitude and phase of the pilot signal at the second bias voltage are used to determine the bias voltage at the start of the optical transmitter.
- the following four patterns can be considered.
- (a) Phase negative, away from the optimum bias point (NULL point) by V ⁇ / 2 or more (FIG.
- the phase of the phase is monitored by the pilot signal demodulation circuit 5 at the first point. As a result, it is determined whether it is located on either the down or up of the V ⁇ curve with the NULL point as the boundary.
- the feedback unit 61 controls the voltage through the bias output circuit 4 in the increasing direction when the V ⁇ curve is descending, and decreasing the voltage when the V ⁇ curve is ascending (FIG. 4A). That is, in the initial state, when the phase of the initial voltage is negative (the amplitude of the pilot signal is negative), the modulator applied voltage (bias voltage) is controlled to increase. When the phase of the initial voltage is positive (the pilot signal amplitude is positive), the modulator applied voltage (bias voltage) is controlled to decrease.
- the pilot signal amplitude once increases with the increase (decrease) in the modulator applied voltage (bias voltage) and reaches the maximum point, and then the optimum bias point ( It goes to the minimum point of the amplitude which is (NULL point). Therefore, the amplitude of the pilot signal at the initial point (first point) and the bias voltage at the second point is compared. If the amplitude of the pilot signal at the second point is large, the voltage is increased or decreased stepwise as shown later.
- the bias voltage value at which the pilot signal amplitude becomes the maximum value or near the maximum value is determined, and the control start voltage is determined based on the bias voltage value. For example, a bias voltage value at which the pilot signal amplitude becomes the maximum value or near the maximum value may be used as the control start voltage. Further, an interpolation value between the bias voltage value at which the pilot signal amplitude becomes the maximum value or near the maximum value and the bias voltage value immediately before the bias voltage value may be used as the control start voltage.
- steps 206a and 206b the pilot signal amplitude value C [V] and the positive / negative phase are stored.
- step 210a and 210b it is determined whether the amplitude value of the pilot signal is C> D (steps 210a and 210b). As a result, when C> D is not satisfied, the process is repeated Y times until the amplitude becomes maximum (steps 211a and 211b), and the process returns to steps 208a and 208b. If C> D is determined in steps 210a and 210b, the start voltage is changed to A ⁇ (Y ⁇ 1) ⁇ ⁇ V or A + (Y ⁇ 1) ⁇ ⁇ V (steps 212a and 212b). . Here, the pilot signal amplitude becomes the maximum value or the vicinity thereof.
- the training process of the pattern (a) or (d) is ended 230.
- Reference numeral 80 in FIG. 11 represents the training process described above.
- the amplitude of the pilot signal also decreases as the modulator applied voltage (bias voltage) increases (decreases). For this reason, the amplitude of the pilot signal at the second point from the initial time point is compared (steps 207a and 207b). If the amplitude of the pilot signal at the second point is small, it is based on the bias voltage value at the second point.
- the control start voltage is determined (steps 220a and 220b).
- the second bias voltage value may be used as the control start voltage.
- An interpolation value between the bias voltage value at the second point and the bias voltage value at the initial point may be used as the control start voltage.
- the training process is terminated here.
- the bias voltage change step ⁇ V in training may be set to V ⁇ / 8
- the value of the change step ⁇ V is only an example. That is, the bias voltage changing step ⁇ V in training may be a value larger than the bias voltage changing step in the subsequent feedback control.
- the change step (change width) of the bias voltage in training is made too large, the control points will be greatly exceeded in patterns (b) and (c). If there is a temperature drift of the modulator due to a rapid temperature change at start-up, it is not desirable to make the variable width too large. Further, if the variable width is small, it takes time for training to search for the control start voltage (start voltage) for the patterns (a) and (d).
- FIG. 4A shows the V ⁇ curve of the modulator
- FIG. 4B shows how the pilot signal amplitude changes with respect to the bias voltage, and a method of locking to the NULL point when the optical transmitter is activated will be described.
- the system 6 performs bias control so as to lock to the control point 1 when the initial voltage is in the slope range V1 when the optical transmitter is started. .
- the phase of the pilot signal in the slope range V5 is negative
- the phase of the pilot signal is positive in the slope range V6.
- FIG. 6 shows the evaluation result of the change of the pilot signal amplitude with respect to the bias voltage.
- the amplitude of the pilot signal is minimized at the NULL point, and the phase of the pilot signal is inverted 180 degrees with respect to the NULL point.
- the optical waveform is as shown in the lower part of FIG.
- the graph is an eye pattern of an optical waveform in phase modulation.
- the feedback control stage 81 after training that is, the control stage to the optimum bias point will be described (FIGS. 11 and 12).
- the modulator applied voltage bias voltage
- the NULL point is detected by sequentially comparing the amplitudes of the pilot signals.
- the control stabilization time can be shortened to about 1/2 at the longest. Also, if the gain in the total feedback system is increased, the control stabilization time can be shortened. However, the lower the gain, the higher the stability as a feedback system. As shown in FIG. 8A and FIG. 8B, when the gain is high with respect to the eye pattern of the optical waveform in the phase modulation, as the jitter in the intensity direction in the optical waveform (fluctuation of the time position of the phase of the signal in the electric signal). This is because it will affect the quality degradation. On the other hand, when the influence of the jitter is small, it is possible to increase the gain and control the bias voltage by the above method.
- the bias voltage value (control start voltage) close to the NULL point (control point) is determined by performing the training process when the optical transmitter is activated, and the bias control is started from the voltage.
- the control stabilization time can be shortened.
- control stabilization time can be shortened while maintaining the stability as the feedback system.
- the control according to this method may be performed only when the optical transmitter is activated (including restart), and normal feedback control may be performed during operation. Thereby, it is not necessary to complicate ABC control.
- the control method of the bias voltage for compensating for the deviation of the operating point described in this embodiment may be realized using a semiconductor processing apparatus including an ASIC (Application Specific Specific Integrated Circuit).
- This method may be realized by causing a computer system including at least one processor (e.g. microprocessor, MPU, DSP (Digital Signal Processor)) to execute a program.
- processor e.g. microprocessor, MPU, DSP (Digital Signal Processor)
- one or a plurality of programs including a group of instructions for causing the computer system to execute the algorithm related to the bias voltage control described with reference to the flowchart or the like may be generated, and the programs may be supplied to the computer.
- Non-transitory computer readable media include various types of tangible storage media (tangible storage medium). Examples of non-transitory computer-readable media include magnetic recording media (eg flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg magneto-optical discs), CD-ROMs (Read Only Memory), CD-Rs, CD-R / W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable ROM), flash ROM, RAM (random access memory)) are included.
- the program may also be supplied to the computer by various types of temporary computer-readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves.
- the temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.
- the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention.
- the amount of voltage change ⁇ V in the training process is not constant and may be changed as appropriate.
- the device and method for via bus voltage control described in the first embodiment are BPSK (binary phase shift keying), 8PSK (8 phase shift keying), OQPSK (offset QPSK), ⁇ / 4 shift QPSK, PLL.
- optical modulators such as QPSK, (pi) / 2 shift BPSK, 16QAM, and 64QAM.
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Abstract
Description
以下、図面を参照しつつ、本発明の実施の形態について説明する。図1を参照すると、光送信機100は、光源1、QPSK(Quadrature Phase Shift Keying)変調器2、DATA Driver3、バイアス出力回路4、パイロット信号復調回路5、システム6を含んで構成される。システム6はフィードバック部61とトレーニング部62を備えている(図10)。
(a) 位相=負、バイアス最適点(NULL点)からVπ/2以上離れている(図5A)
(b) 位相=負、バイアス最適点(NULL点)からVπ/2以内(図5B)
(c) 位相=正、バイアス最適点(NULL点)からVπ/2以内(図5C)
(d) 位相=正、バイアス最適点(NULL点)からVπ/2以上離れている(図5D)
2 QPSK変調器
3 Data Driver
4 バイアス出力回路
5 パイロット信号復調回路
6 システム
7 フォトダイオード
61 フィードバック部
62 トレーニング部
80 トレーニング処理
81 バイアス電圧制御
100 光送信機
201 1回目DAC出力設定
202 パイロット信号の振幅値と位相の正負を記憶
203 初期電圧の位相の正負を判断
204 2回目のDAC出力設定
206 パイロット信号の振幅値と位相の正負を記憶
207 パイロット信号の振幅値を比較
208 3回目のDAC出力を設定
209 パイロット信号の振幅値と位相の正負を記憶
210 パイロット信号の振幅値を比較
211 振幅が最大となるまでY回繰り返す
212 スタート電圧の電圧を設定
230 トレーニング処理終了
Claims (9)
- 光信号を変調して光変調信号を生成する光変調手段と、
パイロット信号が重畳されたバイアス電圧を前記光変調手段に供給するバイアス電圧出力手段と、
前記光変調信号を光電変換することによって、前記パイロット信号に対応するパイロット信号成分を取り出すパイロット信号受信手段と、
バイアス電圧制御手段と、
を備え、
前記バイアス電圧制御手段は、第1及び第2のバイアス電圧値における前記パイロット信号成分に基づいて、前記バイアス電圧の制御開始電圧と制御方向を確定するトレーニング手段と、
前記制御開始電圧及び前記制御方向が決定された後に、前記制御開始電圧から前記制御方向に沿って前記バイアス電圧を段階的に調整しながら前記パイロット信号成分を解析することによって、前記光変調手段の動作点のずれを補償するための適正バイアス電圧を決定するフィードバック手段と、
を含み、
前記第1及び第2のバイアス電圧値の間の第1の電圧ステップは、前記フィードバック手段における前記バイアス電圧の段階的な調整における第2の電圧ステップより大きい、
光送信機。 - 前記トレーニング手段は、前記第1のバイアス電圧値における前記パイロット信号成分の第1の振幅値と前記第2のバイアス電圧値における前記パイロット信号成分の第2の振幅値との比較結果に基づいて前記制御開始電圧を決定する、請求項1記載の光送信機。
- 前記トレーニング手段は、
前記第1のバイアス電圧値における前記パイロット信号成分の第1の位相が正の場合に、前記第1のバイアス電圧値よりも前記第1の電圧ステップだけ小さい電圧値を前記第2のバイアス電圧値とし、
前記第1の位相が負の場合に、前記第1のバイアス電圧値よりも前記第1の電圧ステップだけ大きい電圧値を前記第2のバイアス電圧値とする、
請求項2に記載の光送信機。 - 前記トレーニング手段は、
前記第2の振幅値が前記第1の振幅値より大きい場合に、前記第2のバイアス電圧値を新たな第1のバイアス電圧値に採用し、前記新たな第1のバイアス電圧値と前記新たな第1のバイアス電圧値に基づく新たな第2のバイアス電圧値を用いて動作を繰り返し、
前記新たな第2のバイアス電圧値における前記パイロット信号成分の振幅値が、前記新たな第1のバイアス電圧値における前記パイロット信号成分の振幅値よりも小さい場合に、前記新たな第2のバイアス電圧値に基づいて前記制御開始電圧を決定する、
請求項2または3に記載の光送信機。 - 前記トレーニング手段は、前記第2の振幅値が前記第1の振幅値より小さい場合に、前記第2のバイアス電圧値に基づいて前記制御開始電圧を決定する、請求項2~4いずれか1項に記載の光送信機。
- 光信号を変調して光変調信号を生成する光変調すること、
パイロット信号が重畳されたバイアス電圧を前記光変調の際に供給するバイアス電圧出力すること、
前記光変調信号を光電変換することによって、前記パイロット信号に対応するパイロット信号成分を取り出すパイロット信号受信すること、
バイアス電圧制御すること、
を備え、
前記バイアス電圧制御は、第1及び第2のバイアス電圧値における前記パイロット信号成分に基づいて、前記バイアス電圧の制御開始電圧と制御方向を確定するトレーニング処理すること、
前記制御開始電圧及び前記制御方向が決定された後に、前記制御開始電圧から前記制御方向に沿って前記バイアス電圧を段階的に調整しながら前記パイロット信号成分を解析することによって、前記光変調の際の動作点のずれを補償するための適正バイアス電圧を決定するフィードバックすること、
を含み、
前記第1及び第2のバイアス電圧値の間の第1の電圧ステップは、前記フィードバックする際における前記バイアス電圧の段階的な調整における第2の電圧ステップより大きい、
光送信機のバイアス電圧制御方法。 - 前記トレーニング処理は、前記第1のバイアス電圧値における前記パイロット信号成分の第1の振幅値と前記第2のバイアス電圧値における前記パイロット信号成分の第2の振幅値との比較結果に基づいて前記制御開始電圧を決定する、請求項6記載の光送信機のバイアス電圧制御方法。
- 前記トレーニング処理は、
前記第1のバイアス電圧値における前記パイロット信号成分の第1の位相が正の場合に、前記第1のバイアス電圧値よりも前記第1の電圧ステップだけ小さい電圧値を前記第2のバイアス電圧値とし、
前記第1の位相が負の場合に、前記第1のバイアス電圧値よりも前記第1の電圧ステップだけ大きい電圧値を前記第2のバイアス電圧値とする、
請求項7に記載の光送信機のバイアス電圧制御方法。 - 前記トレーニング処理は、
前記第2の振幅値が前記第1の振幅値より大きい場合に、前記第2のバイアス電圧値を新たな第1のバイアス電圧値に採用し、前記新たな第1のバイアス電圧値と前記新たな第1のバイアス電圧値に基づく新たな第2のバイアス電圧値を用いて動作を繰り返し、
前記新たな第2のバイアス電圧値における前記パイロット信号成分の振幅値が、前記新たな第1のバイアス電圧値における前記パイロット信号成分の振幅値よりも小さい場合に、前記新たな第2のバイアス電圧値に基づいて前記制御開始電圧を決定する、
請求項7または8に記載の光送信機のバイアス電圧制御方法。
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