Phase modulation for an optical transmission system

Details Phase modulation for an optical transmission system Phase modulation for an optical transmission system

2007-12-04

2007-12-04

Tran, Dzung (Department: 2613)

Optical communications

Transmitter

Having particular modulation

C398S187000, C398S188000

Reexamination Certificate

active

10401140

ABSTRACT:
A data modulation apparatus is proposed that includes a data modulator (20) for modulating data onto an optical signal at a predetermined bit rate. The resulting encoded optical signal is phase modulated by a phase modulator (50) that is driven by at least one waveform of a frequency that is 1
of the predetermined bit rate, where n is an integer greater than 2. The application of a phase modulation at a frequency of a third or less of the bit rate of a digital data signal increases the non-linear tolerance of a transmission system by reducing the effect of non-linear pulse-to-pulse interactions. Moreover, this increase in non-linear tolerance is significantly better than that obtained by a phase modulation at one half of the data bit rate, while the implementation of a phase modulator at this lower frequency reduces the complexity of the transmitter.

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R. Ohhira et al., “Novel RZ signal format with alternate-chirp for suppression of nonlinear degradation in 40 Gb/s based WDM”, NEC Corporation, Computer & Communication Media Research, WM2, pp. 1-3, 2001.

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