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Electronics Letters

Reduction of Gordon–Haus jitter by post-transmission dispersion compensation

W. Forysiak, K.J. Blow, Nick J. Doran

Published Jun 24, 1993• 63 citations
Publisher

Abstract

Post-transmission dispersion compensation in optically transparent soliton communication systems is shown to reduce Gordon–Haus jitter by a factor of 2. In practical systems, this improvement is difficult to achieve due to dispersive pulse broadening. Nevertheless, for an example 5 Gbit/s, 10000 km system significant BER improvements (10−9–10−12) are readily attainable.

DOI
10.1049/el:19930818

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Post-transmission dispersion compensation in optically transparent soliton communication systems is shown to reduce Gordon–Haus jitter by a factor of 2. In practical systems, this improvement is difficult to achieve due to dispersive pulse broadening. Nevertheless, for an example 5 Gbit/s, 10000 km system significant BER improvements (10−9–10−12) are readily attainable.
The bit error rate (BER) performance of an optical soliton communication system is analyzed. Based on the jitter variance equation and the chi-square distribution for the amplified spontaneous emission noise, an analytic expression for the BER calculation is obtained. We have investigated the effects of Gordon-Haus jitter, which is due to the random phase shift of the soliton individual central wavelength induced by the amplified spontaneous emission noise of the amplifiers. Very good agreement has been obtained between our theory and the reported experimental results.
Quantum enhancement of optical pulse timing accuracy is investigated in the Heisenberg picture. Effects of optical loss, group-velocity dispersion, and Kerr nonlinearity on the position and momentum of an optical pulse are studied via Heisenberg equations of motion. Using the developed formalism, the impact of decoherence by optical loss on the use of adiabatic soliton control for beating the timing standard quantum limit [M. Tsang, Phys. Rev. Lett. 97, 023902 (2006)] is analyzed theoretically and numerically. The analysis shows that an appreciable enhancement can be achieved using current technology, despite an increase in timing jitter mainly due to the Gordon-Haus effect. The decoherence effect of optical loss on the transmission of quantum-enhanced timing information is also studied, in order to identify situations in which the enhancement is able to survive.
We study the possibility of employing phase-sensitive parametric amplifiers to compensate for losses incurred by solitons propagating in optical fibers. As phase-sensitive amplification is free from the excess spontaneous noise associated with laser amplifiers, the only quantum noise source in such a system arises from the fiber losses. In addition, under phase-sensitive amplification, fluctuations in the soliton frequency are squeezed to one half of the vacuum level, thus producing a negligible contribution to the fluctuations in the soliton arrival time. This greatly reduces the Gordon–Haus jitter of the solitons. The performance of the phase-sensitive amplifier is compared with that of alternative noise-reduction schemes employing phase-insensitive amplifiers and spectral filters as well as with the limits on long-distance data transmission imposed by quantum mechanics.
In this paper, a novel compensation technique is presented for mitigating dispersion in fiber optic microwave frequency transfer systems.By introducing an additional carrier light into the transmission link, the system effectively eliminates the effect of dispersion on temperature in the fiber link.The experimental results show that the long-term stability of microwave frequency transfer over a 100 km optical fiber link is better than 10 -18 /d.This remarkable result strongly demonstrates the feasibility of our proposed scheme, while also highlighting its significant practical significance in ensuring the long-term stability of microwave frequency transfer across hundreds of kilometers of optical fibers.