Optical: systems and elements – Optical modulator – Light wave temporal modulation
Reexamination Certificate
2006-10-10
2006-10-10
Ben, Loha (Department: 2873)
Optical: systems and elements
Optical modulator
Light wave temporal modulation
C398S188000, C398S192000, C398S195000, C372S026000, C372S038070, C332S152000, C332S178000
Reexamination Certificate
active
07119939
ABSTRACT:
A phase modulation circuit for outputting a modulated signal of an input signal which has been modulated to a desired phase. The circuit includes a light emitting element for emitting light according to an input signal and outputting a modulated signal, a bias current source for supplying in advance to a light emitting element a bias current smaller than the light emitting threshold current of the light emitting element, a bias current control unit for controlling the bias current according to a desired phase for supplying to the light emitting element a modulation current for causing the light emitting element to emit light according to the input signal, and a modulation current control unit for controlling the modulation current according to the phase shift resolution in the phase modulation circuit. The modulation current control unit controls modulation current further according to the phase range in the phase modulation circuit.
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Advantest Corporation
Ben Loha
Osha & Liang LLP
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