상세정보
학술지
CFO Compensation Method using Optical Feedback Path for Coherent Optical OFDM System
- 발행일
- 201707
- 출처
- Optical Fiber Technology, v.36, pp.181-186
- ISSN
- 1068-5200
- 출판사
- Elsevier
- 협약과제
- 16MH2500, 100G용 Coherent OFDM DSP 개발, 강헌식
- 초록
- We investigate feasibility of carrier frequency offset (CFO) compensation method using optical feedback path for coherent optical orthogonal frequency division multiplexing (CO-OFDM) system. Recently proposed CFO compensation algorithms provide wide CFO estimation range in electrical domain. However, their practical compensation range is limited by sampling rate of an analog-to-digital converter (ADC). This limitation has not drawn attention, since the ADC sampling rate was high enough comparing to the data bandwidth and CFO in the wireless OFDM system. For CO-OFDM, the limitation is becoming visible because of increased data bandwidth, laser instability (i.e. large CFO) and insufficient ADC sampling rate owing to high cost. To solve the problem and extend practical CFO compensation range, we propose a CFO compensation method having optical feedback path. By adding simple wavelength control for local oscillator, the practical CFO compensation range can be extended to the sampling frequency range. The feasibility of the proposed method is experimentally investigated.
- KSP 제안 키워드
- Analog to digital converter(ADC), CFO Compensation, CFO estimation, Carrier Frequency Offset, Coherent optical orthogonal frequency division multiplexing(CO-OFDM), Compensation algorithm, Compensation method, Feedback Paths(FBP), Frequency Range, Local Oscillator, OFDM systems