Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1994-12-29
1995-12-19
Pascal, Leslie
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359173, 359179, 359334, 372 26, H04B 1004, H04B 1017
Patent
active
054773687
ABSTRACT:
Stimulated Brillouin scattering has been effectively suppressed and the effect of residual amplitude modulation has been mitigated in a dithered optical transmitter by injecting the dithered optical signal into an optical device, such as a highly saturated amplifier, whose small-signal intensity response at the dither frequency dampens the residual amplitude modulation thereby decreasing the eye closure (alternatively, increasing the eye pattern opening). The optical device (e.g., the highly saturated amplifier) exhibits a low frequency cutoff (-3 dB) at a frequency greater than or equal to the inverse of the round trip time for a fiber span with the effective optical transmission length into which the optical signal power is launched. The dither rate is generally in the neighborhood of or below the low cutoff frequency.
REFERENCES:
patent: 5329396 (1994-07-01), Fishman et al.
patent: 5373385 (1994-12-01), Darcie
O. Gautheron et al., "Experimental Investigation of Stimulated Brillouin Scattering and Self-Phase Modulation Effects on Long Distance 2.5 Gbit/s Repeaterless Transmission," Proc. of 19th European Conf. on Optical Communication, vol. 2, Sep. 12-16, 1993, Paper No. TuC4.5, pp. 109-112.
Eskildsen Lars E.
Hansen Per B.
AT&T Corp.
Pascal Leslie
Ranieri Gregory C.
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