Invention Grant
- Patent Title: Alignment of in-phase and quadrature data in quadrature phase shift keying optical transmitters
- Patent Title (中): 正交相移键控光发射机中的同相和正交数据的对准
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Application No.: US13078733Application Date: 2011-04-01
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Publication No.: US08644420B2Publication Date: 2014-02-04
- Inventor: Sunil Kumar Singh Khatana , Lee Dardis
- Applicant: Sunil Kumar Singh Khatana , Lee Dardis
- Applicant Address: US CA San Jose
- Assignee: Opnext Subsystems, Inc.
- Current Assignee: Opnext Subsystems, Inc.
- Current Assignee Address: US CA San Jose
- Agency: Fenwick & West LLP
- Main IPC: H04L27/20
- IPC: H04L27/20
Abstract:
I/Q data skew in a QPSK modulator may be detected by sending identical or complementary data streams to I and Q channel PSK modulators, setting the relative carrier phase between I and Q to zero or π, and monitoring the average QPSK output power, where the data streams sent to the I and Q channels include streams of alternating ones and zeroes.
Public/Granted literature
- US20120250792A1 Alignment of In-phase and Quadrature Data in Quadrature Phase Shift Keying Optical Transmitters Public/Granted day:2012-10-04
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