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6G 프론트홀 광액세스용 200Gbps급 PTBC 기반 단일편광 코히어런트 시스템의 해석적 설계
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- Issue Date
- 2025-12
- Citation
- 전자 정보 통신 학술 대회 (CEIC) 2025, pp.1-4
- Publisher
- 대한전자공학회
- Language
- Korean
- Type
- Conference Paper
- Abstract
- This paper presents a cost-optimized design framework for a single-polarization coherent receiver employing Polarization Time Block Coding (PTBC) for 200-Gbps 6G fronthaul optical access. Under the practical assumptions of −10 dBm launch power, 20-km SMF transmission, C-band operation, and a shotnoise- limited frontend with a noise figure of approximately 7 dB, the electrical SNR at the coherent receiver can exceed 30 dB. This allows the AWGN-induced EVM to be constrained to as low as 3%. Leveraging this margin, the remaining EVM budget is redistributed to key hardware-dominant impairments— including quantization, IQ imbalance, laser phase noise, sampling jitter, chromatic-dispersion-induced ISI, and residual CFO/SCO—with the primary goal of enabling low-cost system implementation. The resulting specifications include 6–7-bit ADC/DAC resolution, an allowable combined laser linewidth on the order of 2 MHz (compatible with DFB/EML-class transmitters), relaxed IRR requirements (28–33 dB), residual SCO tolerance of 5–10 ppm, and moderate equalization complexity. The proposed analytical methodology provides a practical reference model for coherent-lite receivers targeted for 6G fronthaul deployment, enabling cost reduction without compromising essential transmission performance.
- KSP Keywords
- Analytical methodology, Band operation, C-band, Coherent receiver, DAC resolution, IQ imbalance, Laser linewidth, Low-cost system, Reference model, Single polarization, Time block