Open AccessFirst demonstration of high-order QAM signal amplification in PPLN-based phase sensitive amplifier
Author(s) -
Takeshi Umeki,
O. Tadanaga,
Masaki Asobe,
Yutaka Miyamoto,
Hirokazu Takenouchi
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.002473
Subject(s) - optics , quadrature amplitude modulation , amplifier , lithium niobate , phase noise , physics , signal (programming language) , phase modulation , optical parametric amplifier , amplitude modulation , phase (matter) , optical amplifier , materials science , optoelectronics , telecommunications , bandwidth (computing) , frequency modulation , laser , bit error rate , computer science , channel (broadcasting) , cmos , quantum mechanics , programming language
We demonstrate the phase sensitive amplification of a high-order quadrature amplitude modulation (QAM) signal using non-degenerate parametric amplification in a periodically poled lithium niobate (PPLN) waveguide. The interaction between the pump, signal, and phase-conjugated idler enables us to amplify arbitrary phase components of the signal. The 16QAM signals are amplified without distortion because of the high gain linearity of the PPLN-based phase sensitive amplifier (PSA). Both the phase and amplitude noise reduction capabilities of the PSA are ensured. Phase noise cancellation is achieved by using the interaction with the phase-conjugated idler. A degraded signal-to-noise ratio (SNR) is restored by using the gain difference between a phase-correlated signal-idler pair and uncorrelated excess noise. The applicability of the simultaneous amplification of multi-carrier signals and the amplification of two independent polarization signals are also confirmed with a view to realizing ultra-high spectrally efficient signal amplification.