研究目的
Investigating the performance benefits of LA-LLF over SMF fibers in PM-QPSK multichannel systems, focusing on the effects of crosstalk and optical signal degradation when system variables such as number of channels, channel spacing, and laser power levels are varied.
研究成果
The study concludes that LA-LLF is superior to SMF in PM-QPSK multichannel systems due to its higher tolerance towards nonlinearities in the presence of high powers and narrow channel spacing. LA-LLF shows significant performance benefits in terms of Q factor and capacity, making it a cost-effective and reliable solution for improving transmission quality in high capacity multichannel systems.
研究不足
The study is based on numerical simulations, which may not fully capture all real-world conditions and variations. The impact of Rx noise loading is noted to be negligible, which might not hold in all practical scenarios.
1：Experimental Design and Method Selection:
The study uses numerical simulations to compare the performance of SMF and LA-LLF in high power DWDM systems. The simulations are conducted using VPIphotonics Design SuiteTM Version
2：8, solving the nonlinear Schrodinger equation (NLS) for given fiber parameters. Sample Selection and Data Sources:
The study considers multichannel EDFA amplified transmission links with different channel spacings.
3：List of Experimental Equipment and Materials:
The setup includes standard I Q modulators, PRBS of length 231-1, nyquist filter with roll off factor of
4：18, uncompensated fiber spans of length 80 km, EDFA, polarization tracker, preamplifier, 4th order Gaussian tunable band pass filter, local oscillator (LO), two 900 hybrid, four balanced photo-detectors (BPD), 5th-order low-pass Bessel filter (LPF), and analog-to-digital converter (ADC). Experimental Procedures and Operational Workflow:
The optical link simulation includes signal generation, transmission through fiber spans, amplification, polarization tracking, filtering, detection, and digital signal processing for CD compensation, PMD and polarization cross-talk correction, and phase noise estimation.
5：Data Analysis Methods:
The performance is evaluated in terms of Bit Error Rate (BER) and Q factor, with simulations conducted considering in-line ASE noise.
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