Performance of fiber transmission systems by transforming return-to-zero format to non-return-to-zero format in front of receiver
First Claim
1. A method to improve the system performance of an optical fiber transmission system by using the optical RZ format as the transmission format, transferring the RZ format to the NRZ (or NRZ-like) format in front of the receiver, then detecting the NRZ (or NRZ-like) format at the receiver.
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Abstract
There is enclosed a new optical signal detection scheme by means of converting transmitted optical RZ pulses to NRZ pulses. An optical fiber transmission system which uses the RZ format as the transmission format, and uses an optical pulse transformer to transform the optical RZ format to NRZ format in front of the receiver, then uses the NRZ format as the detection format at the receiver. One optical pulse transformer, which comprises an optical pre-amplifier, an optional optical filter and a span of normal dispersion fiber to transform high power optical RZ pulses to optical NRZ pulses by the combination effects of self-phase modulation and normal dispersion, is proposed and demonstrated. The tolerances for both the generalized timing jitter and amplitude jitter are increased significantly by using this invention. The Q factor is also increased by as much as 5.4 dB, which is a significant improvement on system performance.
35 Citations
18 Claims
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1. A method to improve the system performance of an optical fiber transmission system by using
the optical RZ format as the transmission format, transferring the RZ format to the NRZ (or NRZ-like) format in front of the receiver, then detecting the NRZ (or NRZ-like) format at the receiver.
- 7. An optical fiber transmission system comprising at least one optical transmitter to generate optical RZ pulses, (optional) WDM multiplexers or couplers, (optional) pre-dispersion compensation units, one transmission link consisted of fiber spans and amplifiers, post-dispersion compensation units, WDM demultiplexer or couplers, (optional) optical pulse transformers which transfers optical RZ pulses to optical NRZ (or NRZ-like) pulses, and receivers to detect optical NRZ (or NRZ-like) pulses.
Specification