Fiber-Nonlinearity-Tolerant Superchannel Transmission via Nonlinear Noise Squeezing and Generalized Phase-Conjugated Twin Waves

• Published in: Journal of lightwave technology 2014-02, Vol.32 (4), p.766-775
• Main Authors: Xiang Liu, Chandrasekhar, S., Winzer, P. J., Tkach, R. W., Chraplyvy, A. R.
• Format: Article
• Language: English
• Subjects: Applied sciences; Circuit properties; Coherent optical transmission; Constellation diagram; Detection, estimation, filtering, equalization, prediction; digital signal processing; Electric, optical and optoelectronic circuits; Electronics; Erbium-doped fiber amplifiers; Exact sciences and technology; fiber nonlinearity mitigation; Information, signal and communications theory; Integrated optics. Optical fibers and wave guides; Nonlinear distortion; Optical and optoelectronic circuits; Optical fiber communications; Optical fiber couplers; Optical fiber dispersion; Optical fiber polarization; Optical telecommunications; phase-conjugated twin waves; Signal and communications theory; Signal, noise; superchannel transmission; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments)
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2013.2280998

We present fiber-nonlinearity-tolerant transmission of polarization-division multiplexed binary phase-shift keying (PDM-BPSK) through a nonlinear noise squeezing (NLNS) effect that is achieved by optimized digital electronic dispersion precompensation. With the improved nonlinear tolerance, a 406.6-Gb/s superchannel consisting of eight 37.5-GHz-spaced 32-Gbaud Nyquist-filtered PDM-BPSK signals is transmitted over a 12800-km (160 × 80-km) EDFA-only amplified dispersion-unmanaged nonzero-dispersion-shifted fiber link. We establish a connection between the beneficial NLNS effect and the recently reported phase-conjugated twin wave (PCTW) concept and further generalize the PCTW concept to vector twin waves that are traveling through a fiber link along orthogonal dimensions such as time and space. Moreover, we apply the PCTW concept to wavelength-division-multiplexed (WDM) superchannel transmission by treating the entire WDM superchannel as a twin wave to further mitigate interchannel nonlinear effects. Through numerical simulations, we show that the generalized PCTW technique can effectively mitigate interchannel nonlinear impairments, in addition to mitigating intrachannel nonlinear impairments.