Optical communications – Transmitter – Including specific optical elements
Reexamination Certificate
2007-11-13
2007-11-13
Pascal, Leslie (Department: 2613)
Optical communications
Transmitter
Including specific optical elements
C398S188000, C398S190000, C398S193000
Reexamination Certificate
active
10892890
ABSTRACT:
The present invention relates to an apparatus and method for performing optical Differential Phase Shift Keying (DPSK) modulation, which transmits a phase difference between adjacent bits as information. The electrically band-limited optical DPSK modulating apparatus includes a light source, a Non-Return-to-Zero (NRZ) signal generator, a pre-coder, an electrical low pass filter, and a phase modulator. The NRZ signal generator generates a NRZ signal. The pre-coder codes the NRZ signal generated by the NRZ signal generator into a differential signal. The low pass “filter electrically limits a bandwidth of the differential signal obtained through the pre-coder. The phase modulator modulates an optical signal input from the light source into a DPSK signal using the differential signal having the bandwidth electrically limited by the low pass filter.
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1.6 Tb/s (40×40 Gb/s) DPSK Transmission with Direct Detection, Jan. 2003, Bisse ssur et al, Electronic Letters, vol. 39, Issue 2, pp. 192-193.
Han Jin Soo
Jang Youn Seon
Lee Hyun Jae
Blakely & Sokoloff, Taylor & Zafman
Electronics and Telecommunications Research Institute
Pascal Leslie
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