研究目的
To demonstrate a structure-simplified and cost-effective coherent receiver scheme for high splitting downstream transmission in next-generation passive optical networks (NG-PONs).
研究成果
The proposed simplified coherent receiver achieves high sensitivity and cost reduction for NG-PONs, with simulation results showing -42.3 dBm for PM-QPSK and -35.4 dBm for PM-16QAM at BER 3.8e-3 in BtB, and power budgets up to 58.1 dB and 42.4 dB after 40km transmission. Experimental validation confirms comparable performance to conventional receivers, making it suitable for high-capacity, long-reach applications.
研究不足
Experimental setup uses a 90° optical hybrid as an equivalent to the 3 dB coupler, introducing a 3 dB power penalty. Limited LO laser power (12 dBm vs. optimal 15 dBm), lower BPD responsivity, and higher thermal noise in experiments degrade performance compared to simulations. The scheme increases BPD bandwidth requirements.
1：Experimental Design and Method Selection:
The study uses a simplified coherent receiver with a 3 dB coupler replacing the 90° optical hybrid and electrical LO for down-conversion, reducing components. Numerical simulations and experiments are conducted to validate performance.
2：Sample Selection and Data Sources:
Simulations use 14G Baud PM-QPSK and PM-16QAM signals with 2^17-1 PRBS. Experiments involve BtB, 20km, and 40km SSMF transmissions.
3：List of Experimental Equipment and Materials:
Includes CW laser, MZM, PBS, PBC, LO laser, 3 dB coupler, BPD, LPF, ADC, DSP module, SSMF, AWG, ECL, Picometrix CR-100D coherent receiver, digital scope.
4：Experimental Procedures and Operational Workflow:
Signals are generated, modulated, transmitted over fiber, received, down-converted, filtered, digitized, and processed with DSP for CD compensation, equalization, FOE, CPE, and BER calculation.
5：Data Analysis Methods:
BER is measured at FEC limit, power budget is calculated, and performance is compared with conventional receivers using simulation and experimental data.
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