Experimental investigation of phase-sensitive amplification of data signals in a four-mode fiber-based PSA

Abstract

In this Letter, we investigate the influence of the phase and power of pump and signal waves on the gain of a four-mode phase-sensitive amplifier (PSA) built with a highly nonlinear fiber (HNLF), using a copier + PSA scheme to generate phase- and frequency-correlated idler waves. Using such an amplifier, low-noise amplification of a 10 Gsymbol/s quadrature phase-shift keying (QPSK) signal, with net gain of ∼20 dB and less than 1 dB optical signal-to-noise ratio (OSNR) penalty at a bit error ratio (BER) of 10(-3), was achieved. We also verified an additional net gain of 11.6 dB when switching from phase-insensitive to phase-sensitive operation, which is in good agreement with theoretical predictions of 12 dB.

Analytical seven-wave model for wave propagation in a degenerate dual-pump fiber phase sensitive amplifier

“…In the context of PSA noise figure calculations, McKinstrie et al analyzed the 6-wave model, however providing an analytical solution under certain special cases only [33]. Such 6-wave systems were experimentally investigated by Albuquerque et al [34].…”

Investigation of analog signal distortion introduced by a fiber phase sensitive amplifier

“…The possibility of noiseless amplification in PSAs has been extensively studied in the context of digital optical communication links [15][16][17][18][19][20]. Nowadays digital links are widely used across communication platforms, but such links are limited by the bandwidth of analog-to-digital converters (ADC).…”