Experimental investigation of phase-sensitive amplification of data signals in a four-mode fiber-based PSA
; Puttnam, B. J.
; Mendinueta, J.M.
Drummond, M. V.
; Shinada, S.
; Wada, N.
Optics Letters Vol. 40, Nº 2, pp. 288 - 291, January, 2015.
ISSN (print): 0146-9592
ISSN (online): 1539-4794
Journal Impact Factor: 3,772 (in 2008)
Digital Object Identifier: 10.1364/OL.40.000288
In this Letter, we investigate the influence of the phase and power of pump and signal waves on the gain of a fourmode
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.