Coherent light generators – Particular beam control device – Optical output stabilization
Reexamination Certificate
2004-05-13
2008-12-02
Harvey, Minsun (Department: 2828)
Coherent light generators
Particular beam control device
Optical output stabilization
C372S029021, C372S032000, C372S034000, C372S020000
Reexamination Certificate
active
07460572
ABSTRACT:
The present invention provides wavelength monitoring and/or control enabling size reduction and low power operation without requiring a complicated optical system in its wavelength monitoring and controlling mechanism.The measurement portion (1) measures temperature by a thermistor (5) in the measurement portion, and measures a bias current by using an LD drive current detecting circuit (6). The LD temperature, optical output and bias current are measured by the measurement portion. The relationship between the LD temperature and wavelengths or between the temperature, bias current and wavelengths is stored in a memory map of the storage portion (2). The central controlling portion (3) calculates wavelengths on the basis of the temperature and the bias current or the temperature information of the measurement portion, and the relationship between the LD temperature, bias current and wavelengths or between the temperature and wavelengths of the storage portion.
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Iwatsuki Katsumi
Kawada Hideo
Kawai Shingo
Ogawa Toru
Yoshimoto Naoto
Carter Michael
Fitch Even Tabin & Flannery
Harvey Minsun
Nippon Telegraph and Telephone Corporation
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