Optical communications – Receiver
Reexamination Certificate
2011-05-24
2011-05-24
Phan, Hanh (Department: 2613)
Optical communications
Receiver
C398S183000, C398S188000, C398S212000, C398S213000, C398S214000, C398S209000, C398S033000, C398S038000, C385S024000, C385S027000, C385S011000, C385S015000, C385S001000, C356S477000, C356S460000
Reexamination Certificate
active
07949260
ABSTRACT:
An evaluation method of an optical receiver of an optical communication system, including a DPSK (Differential Phase Shift Keying) signal modulated by a specific data series, a delay interferometer for performing delay detection on the DPSK signal, an optical receiver for receiving each of two optical outputs of the delay interferometer and outputting a difference signal, and a spectrum analyzer for measuring a spectrum of an output electrical signal of the optical receiver, comprising monitoring a specific frequency component of the spectrum analyzer and detecting a delay difference and a deviation in optical reception level between the two outputs of the delay interferometer and the optical receiver.
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NEC Corporation
Phan Hanh
Young & Thompson
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