Optical waveguides – With optical coupler – Plural
Patent
1991-08-12
1992-08-18
Healy, Brian
Optical waveguides
With optical coupler
Plural
385 39, 385 31, 359124, 359173, 359341, G02B 628, H04J 100
Patent
active
051406560
ABSTRACT:
In soliton optical fiber communication systems that comprise a multiplicity of spaced-apart intermediate non-electronic amplifiers, pulse arrival time jitter can be substantially reduced by incorporation into the transmission path of spaced-apart bandwidth-limiting elements. Exemplarily, the bandwidth-limiting elements are optical filters of bandwidth B.sub.f, with a filter associated with each intermediate amplifier, and with B.sub.f chosen to fall within the range B.sub.sol (N.sub.f /3).sup.1/2, where B.sub.sol is the FWHM spectral width of the soliton pulses, and N.sub.f is the number of intermediate filters in the system. More generally, the bandwidth-limiting elements are selected such that >.delta.t.sup.2 >, the variance of the jitter, is at most 90% of the variance associated with an, otherwise identical, comparison system that does not contain the bandwidth-limiting elements. Systems according to the invention thus can overcome the Gordon-Haus limit on the bit rate/distance product.
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Hasegawa Akira
Kodama Yuji
Marcuse Dietrich
AT&T Bell Laboratories
Healy Brian
Pacher E. E.
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