Optical Mitigation of Interchannel Crosstalk for Multiple Spectrally Overlapped 20-GBd QPSK/16-QAM WDM Channels Using Nonlinear Wave Mixing
| Autor: | Moshe Tur, Huibin Zhou, Alan E. Willner, Fatemeh Alishahi, Joseph D. Touch, Martin M. Fejer, Kaiheng Zou, Bishara Shamee, Ahmed Almaiman, Amirhossein Mohajerin-Ariaei, Ahmad Fallahpour, Yinwen Cao, Ari N. Willner, Carsten Langrock, Changjing Bao, Peicheng Liao |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
business.industry Keying 02 engineering and technology Multiplexing Atomic and Molecular Physics and Optics 020210 optoelectronics & photonics Optics Wavelength-division multiplexing 0202 electrical engineering electronic engineering information engineering Bit error rate Channel spacing business Optical filter Quadrature amplitude modulation Phase-shift keying |
| Zdroj: | Journal of Lightwave Technology. 37:548-554 |
| ISSN: | 1558-2213 0733-8724 |
| Popis: | Optical mitigation of interchannel interference (ICI) for multiple spectrally overlapped data channels is experimentally demonstrated without multichannel detection and channel spacing estimation. The ICI mitigation takes place in three stages of periodically poled lithium niobate (PPLN) waveguides. In the first PPLN stage, the conjugate copies of channels are generated. In the second stage, the overlapped signals are coherently multiplexed with different complex taps. In the third stage, the concurrent nonlinear processes and the coherent multiplexing of the signals with their delayed copies compensate the ICI. The bit error rate and the constellation diagrams of wavelength division multiplexed (WDM) channels carrying quadrature phase-shift keying (QPSK) or 16 quadrature amplitude modulation (16-QAM) formats demonstrate the potential capability of the proposed method to reduce the ICI and its possible modulation format transparency. The effect of channel spacing on the performance of the method is also demonstrated. After optical ICI mitigation, a reduction of almost 4 dB is achieved for the value of optical signal-to-noise ratio at BER of 10–3 for 20-GBd QPSK signals with a channel spacing of 17.5 GHz. The overlapped WDM system of 20-GBd 16-QAM signals with channel spacing of 17.5 GHz is also ICI mitigated and error vector magnitudes are reduced by almost 28%. |
| Databáze: | OpenAIRE |
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