A novel phase-locking-free phase sensitive amplifier-based regenerator

Kjøller, Niels-Kristian, Røge, Kasper Meldgaard, Guan, Pengyu, Mulvad, Hans Christian, Galili, Michael and Oxenløwe, Leif Katsuo (2016) A novel phase-locking-free phase sensitive amplifier-based regenerator. Journal of Lightwave Technology, 34 (2), 643-652. (doi:10.1109/JLT.2015.2482122).

Abstract

We propose a scheme for phase regeneration of optical binary phase-shift keying (BPSK) data signals based on phase sensitive amplification without active phase locking. A delay interferometer is used to convert a BPSK signal impaired by noise to an amplitude modulated signal followed by cross-phase modulation in a highly nonlinear fiber (HNLF), which transfers the data modulation from the amplitude modulated signal to the phase of a locally generated carrier. By placing the HNLF in a loop, a stable phase relation is maintained relative to a set of counter propagating locally generated phase-locked pumps. As a result, active phase stabilization is avoided. A proof-of-principle experiment is carried out with a dual-pump degenerate phase sensitive amplifier, demonstrating regeneration for a 10-Gb/s non-return-to-zero differential BPSK data signal degraded by a sinusoidal phase-noise tone. Receiver sensitivity improvements of 3.5 dB are achieved at a bit error rate of 10-9. In addition, numerical simulations are performed comparing the idealized regenerator performance in the presence of sinusoidal phase modulation as well as Gaussian phase noise.

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Contributors

Author: Hans Christian Mulvad

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