Invention Grant
- Patent Title: Subscriber terminal of adjusting intensity of optical signal by controlling attenuation, and a method thereof
- Patent Title (中): 通过控制衰减来调整光信号强度的用户终端及其方法
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Application No.: US12801356Application Date: 2010-06-04
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Publication No.: US08280252B2Publication Date: 2012-10-02
- Inventor: Masahiro Sarashina
- Applicant: Masahiro Sarashina
- Applicant Address: JP Tokyo
- Assignee: Oki Electric Industry Co. Ltd.
- Current Assignee: Oki Electric Industry Co. Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Rabin & Berdo, P.C.
- Priority: JP2009-164631 20090713
- Main IPC: H04J14/00
- IPC: H04J14/00

Abstract:
A subscriber terminal connected to a central-office unit in an optical communication network includes a variable optical attenuator for attenuating an optical signal received from the central-office unit; an optical-electric converter for converting the optical signal received via the attenuator to a corresponding electric signal; a clock extractor for extracting a clock from the electric signal and producing a clock extraction information signal representing whether or not the clock is extracted stably; and a terminal controller. The controller includes a clock extraction decider for determining whether or not the extractor stably extracts the clock on the basis of the information signal, a receiving level adjuster for setting an attenuation value to a value between a minimum and a maximum value, and an attenuation controller for setting the attenuation amount for the attenuator to the set attenuation value.
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