Optical communications – Transmitter – Having particular modulation
Reexamination Certificate
2005-03-08
2005-03-08
Pascal, Leslie (Department: 2633)
Optical communications
Transmitter
Having particular modulation
C398S182000, C398S184000, C398S185000, C398S186000, C398S187000, C398S188000, C398S189000, C398S201000
Reexamination Certificate
active
06865348
ABSTRACT:
A system which improves wavelength tolerance, compensates dispersion in a simple way, reduces limitation of the fiber input power is disclosed. The operation includes receiving a clock signal from a system clock source; modulating a single mode optical signal based on the clock signal and generating an optical pulse signal having two longitudinal modes, the frequency interval thereof being n×B, n being a natural number and B being a transmission speed; generating a partial response signal by converting a binary NRZ signal from a digital signal source in synchronism with the system clock source; and modulating the optical pulse signal based on the partial response signal, and outputting a binary RZ modulated signal. The binary RZ modulated signal is input into a receiver, where two partial response components in the optical spectra of the input signal are divided, and one or both of the components are received.
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Hirano Akira
Matsuura Akihiko
Miyamoto Yutaka
Sato Kenji
Toba Hiromu
Nguyen Chau M.
Nippon Telegraph and Telephone Corporation
Pascal Leslie
Thelen Reid & Priest LLP
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