Phase modulator-based generation of high-quality high bit rate r

Details Phase modulator-based generation of high-quality high bit rate r Phase modulator-based generation of high-quality high bit rate r

1997-06-13

2000-06-06

Hofsass, Jeffery A.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359181, 359184, H04B 1004

Patent

active

060726156

ABSTRACT:
Apparatus and method for generating a return-to-zero (RZ) optical data stream. A laser or other continuous wave (CW) optical source generates an optical carrier signal which is applied to a phase modulator. A return-to-zero data generator multiplies a non-return-to-zero (NRZ) electrical data stream and a sinusoidal electrical signal to generate an RZ electrical data stream. The phase modulator modulates the RZ electrical data stream onto the optical carrier signal to generate a phase-modulated optical signal. A Stokes portion or an anti-Stokes portion of the phase-modulated optical signal spectrum is then spectrally separated in an optical filter to provide a corresponding output RZ optical data stream. The spectral separation may be provided using a discrete filter coupled to the output of the phase modulator, or using transmission line filtering in a soliton transmission system. The use of the phase modulator to perform data encoding operations avoids the modulation bias drift problems inherent in amplitude modulators.

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N.M. Froberg et al., "Integrated data encoding of a 5-Gbit/sec soliton pulse train using a laser/modulator transmitter," Technical Digest of the Optical Fiber Communication Conference, 1995 OSA Technical Digest Series, vol. 8, paper Tu15, pp. 40-41, OSA, Washington DC, 1995.
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