First demonstration of high-order QAM signal amplification in PPLN-based phase sensitive amplifier.

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.

[1]  Takeshi Umeki,et al.  Phase sensitive amplification with noise figure below the 3 dB quantum limit using CW pumped PPLN waveguide. , 2012, Optics express.

[2]  Yue-Kai Huang,et al.  Demonstration of digital phase-sensitive boosting to extend signal reach for long-haul WDM systems using optical phase-conjugated copy. , 2013, Optics express.

[3]  Naoya Wada,et al.  Phase-squeezing properties of non-degenerate PSAs using PPLN waveguides. , 2011, Optics express.

[4]  David J. Richardson,et al.  All-optical phase and amplitude regenerator for next-generation telecommunications systems , 2010 .

[5]  P. Andrekson,et al.  Towards ultrasensitive optical links enabled by low-noise phase-sensitive amplifiers , 2011 .

[6]  Takeshi Umeki,et al.  Highly Efficient Wavelength Converter Using Direct-Bonded PPZnLN Ridge Waveguide , 2010, IEEE Journal of Quantum Electronics.

[7]  Takeshi Umeki,et al.  First demonstration of multi-span transmission using phase and amplitude regeneration in PPLN-based PSA , 2013, 2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC).

[8]  Xiang Liu,et al.  Phase-conjugated twin waves for communication beyond the Kerr nonlinearity limit , 2013, Nature Photonics.

[9]  Zhi Tong,et al.  Noise performance of optical fiber transmission links that use non-degenerate cascaded phase-sensitive amplifiers. , 2010, Optics express.

[10]  Atsushi Takada,et al.  Low-noise amplification under the 3 dB noise figure in high-gain phase-sensitive fibre amplifier , 1999 .

[11]  M M Fejer,et al.  1.5-microm-band wavelength conversion based on difference-frequency generation in LiNbO3 waveguides with integrated coupling structures. , 1998, Optics letters.

[12]  V. S. Grigoryan,et al.  Inline frequency-non-degenerate phase-sensitive fibre parametric amplifier for fibre-optic communication , 2005 .

[13]  QPM Wavelength Converter Using Direct-Bonded Ridge Waveguide With Integrated MMI Multiplexer , 2011, IEEE Photonics Technology Letters.

[14]  Guifang Li,et al.  Phase Regeneration of NRZ-DPSK Signals Based on Symmetric-Pump Phase-Sensitive Amplification , 2007, IEEE Photonics Technology Letters.

[15]  Takeshi Umeki,et al.  3-dB signal-ASE beat noise reduction of coherent multi-carrier signal utilizing phase sensitive amplification. , 2012, Optics express.