Apparatus and method for detecting beam power in optical drive

Details Apparatus and method for detecting beam power in optical drive Apparatus and method for detecting beam power in optical drive

2006-06-27

2006-06-27

Payne, David C (Department: 2638)

Optical communications

Diagnostic testing

Determination of communication parameter

C369S053130, C369S044140

Reexamination Certificate

active

07068933

ABSTRACT:
An apparatus and method for detecting beam power generated by a plurality of light sources, using a single device. The apparatus includes a light-receiving unit that receives the beam power generated by one of a plurality of light sources, and an amplifying unit that selects a gain, amplifies the beam power received by the light-receiving unit according to the selected gain, and outputs the beam power amplified as a detected beam power. According to the apparatus and method, received beam power (or amplification gain) is amplified by a gain determined according to the characteristics of the respective light sources. Thus, it is possible to provide the detected beam power in consideration of a sufficient dynamic range for the each light source, thereby realizing effective APC.

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Japanese Office Action; mail date Dec. 22, 2005; Application No. 2002-208768.

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