DPSK Signal Regeneration With a Dual-Pump Nondegenerate Phase-Sensitive Amplifier

Abstract

Abstract-We demonstrate, for the first time to our knowledge, regeneration of a 42.66 Gbit/s differential phase shift keyed signal using a dual-pump non-degenerate four wave mixing-based fiber optic parametric amplifier. The regenerative performance of the subsystem is characterized in terms of biterror-rate against narrow-band and wide-band introduced noise. Whilst a strong receiver sensitivity improvement, up to 20 dB, is noticed against narrow-band noise, against quasi-random (wideband) noise we observe a regeneration of 2.7 dB.Index Terms-differential phase shift keying (DPSK), optical parametric amplification, phase-sensitive amplification (PSA)I. INTRODUCTION LL-OPTICAL regenerators are expected to extend the transparent length of high-speed transmission systems and simultaneously lower the energy consumption, compared to their opto-electro-optical counterparts [1]. The emergence of differential phase shift keying (DPSK) as a widely adopted modulation format for long haul transmission has prompted great interest in regeneration schemes for phase encoded signal formats. Such regenerators should provide suppression of the accumulated noise in both the amplitude and the phase of the propagated signal.Phase sensitive amplification (PSA) has proved its potential for phase noise suppression on DPSK signals. Initial schemes were based on single pump degenerate four wave mixing (FWM) in a fiber [2], [3]. Regeneration based on dual pump degenerate fiber optic parametric amplifier (FOPA) has also been proved both theoretically [4] and experimentally [5]. Using the phase locking scheme proposed in [6] to generate a pair of synchronized and frequency symmetric pump signals, the first practical "black-box" regenerator has been demonstrated in [7]. The regenerative properties of those

Magnetically-controllable optical multi-stability in magneto-optic fiber Bragg gratings with potential applications to multi-level all-optical regeneration

“…However, at the present time, the desirable regenerators for multilevel modulation formats are hardly available due to the difficulty in simultaneously deriving amplitude and phase regeneration regardless of a few schemes [4][5][6][7][8][9][10]. For example, the all-optical regeneration of DPSK can respectively be obtained by phase preserving limiter [5], amplitude regenerator with format conversion [6], nonlinear optical fiber loop mirror (NOLM) [7] or the phase sensitive amplifier (PSA) [8]. Multilevel amplitude regenerative structures based on NOLM and directional interference were theoretically proposed by Sorokina [9] and Hierold [10], respectively.…”

Phase-diversity phase-sensitive amplification in fiber loop with polarization beam splitter

“…This unique output property of PSA can be utilized for the phase stabilization or signal regeneration of the phase-modulated signal light. Various studies have reported PSA-based phase regeneration [3][4][5][6][7][8].…”

Modeling of optical carrier recovery using four wave mixing technique for binary phase shift keying systems

“…Therefore, it is essential to cater for these developments, the modulation schemes should be shifted from amplitude-shift-keying (ASK) to phase shift keying (PSK) schemes, such as Binary Phase Shift Keying (BPSK), Differential Phase Shift Keying (DPSK), etc [3]. Moreover, most of the recently deployed high capacity systems are operating on phase modulation schemes [3], [4]. Because of this reasons the methods used for signal processing in amplitude modulation schemes will be no longer effective.…”

“…This research intends to show an attempt of carrier recovery. The relevant applications are phase synchronization for phase regeneration [3], [4], phase sensitive amplification [3], [7] and homodyne receivers [8], [9].…”