JP6630514B2 - 光変調装置 - Google Patents
光変調装置 Download PDFInfo
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- JP6630514B2 JP6630514B2 JP2015158222A JP2015158222A JP6630514B2 JP 6630514 B2 JP6630514 B2 JP 6630514B2 JP 2015158222 A JP2015158222 A JP 2015158222A JP 2015158222 A JP2015158222 A JP 2015158222A JP 6630514 B2 JP6630514 B2 JP 6630514B2
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- bias voltage
- modulator
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- 230000003287 optical effect Effects 0.000 claims description 26
- 238000001514 detection method Methods 0.000 claims description 14
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 description 15
- 239000013307 optical fiber Substances 0.000 description 7
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- 230000001934 delay Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
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- 238000013459 approach Methods 0.000 description 1
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Optical Communication System (AREA)
Description
Claims (1)
- 入力信号およびバイアス電圧に応じて光を変調する変調部と、
前記バイアス電圧を設定するバイアス設定部と、
前記バイアス電圧にパイロット信号を含ませるパイロット信号生成部と、
前記変調部の出力光から前記パイロット信号を検出する検出部と、を備え、
前記変調部は、
印加電圧の変化に対して周期的に前記出力光の大きさが変化する特性を有し、
前記バイアス設定部は、
第1の刻み幅で前記バイアス電圧を変化させながら、前記検出部による検出値の大きさが極大値となるときのポインタ電圧を探索し、
前記バイアス電圧に対する前記出力光の周期に基づき予め定められた電圧を、前記パイロット信号と前記検出値との極性の関係に応じて、前記ポインタ電圧に加算または前記ポインタ電圧から減算した電圧を前記探索開始電圧として決定し、
前記第1の刻み幅よりも小さい第2の刻み幅で前記探索開始電圧から前記バイアス電圧を変化させながら、前記検出値の大きさが極小値となるときの前記バイアス電圧を探索し、
前記探索開始電圧は、前記ポインタ電圧よりも、前記検出値の大きさが極小値となるときの前記バイアス電圧に近い値であることを特徴とする光変調装置。
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JP6630514B2 true JP6630514B2 (ja) | 2020-01-15 |
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US9735884B2 (en) * | 2012-08-28 | 2017-08-15 | Nec Corporation | Optical transmitter and bias voltage control method |
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