Light receiving circuit, semiconductor laser device, and...

Details Light receiving circuit, semiconductor laser device, and... Light receiving circuit, semiconductor laser device, and...

2006-01-10

2008-12-30

Yam, Stephen (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140AG, C250S2140LS, C250S226000, C369S112220, C369S134000, C372S029021, C372S033000

Reexamination Certificate

active

07470886

ABSTRACT:
There is provided a light receiving circuit capable of preventing an output variation of the light receiving circuit due to a change in ambient temperature with a simple configuration.The light receiving circuit is provided with a photodiode4for LD power monitoring and an I-V amplifier5connected with a feedback resistor13, wherein a light receiving section16of the photodiode4is covered with a protective film19. Temperature dependences between a light transmittance of the protective film19in accordance-with a shift of a wavelength of a laser beam due to a change in ambient temperature, and a resistance value of the feedback resistor13are set in such a way that they may be mutually compensated and an output voltage from the light receiving circuit may be constant for a temperature change.

REFERENCES:
patent: 4013845 (1977-03-01), Sugimoto et al.
patent: 6479810 (2002-11-01), Weindorf
patent: 6603110 (2003-08-01), Hayami et al.
patent: 6674709 (2004-01-01), Asada et al.
patent: 6720826 (2004-04-01), Yoon
patent: 6768096 (2004-07-01), Hammond et al.
patent: 6933485 (2005-08-01), Livermore et al.
patent: 11041036 (1999-02-01), None

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