Summary
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The Evaluation for Required Bit Resolution of Digital-Analog-Converter in Optical OFDM Signal Generation Hidenori TAKAHASHI Itsuro MORITA Hideaki TANAKA Publication IEICE TRANSACTIONS on Communications Vol.E94-B No.2 pp.425-429 Publication Date: 2011/02/01 Online ISSN: 1745-1345 DOI: 10.1587/transcom.E94.B.425 Print ISSN: 0916-8516 Type of Manuscript: Special Section PAPER (Special Section on Extremely Advanced Optical Transmission Technologies and Transmission Optical Fiber Technologies towards Exabit Era) Category: Keyword: OFDM, DAC, resolution, Full Text: PDF>>
Summary: The required bit resolution of digital-analog-converter (DAC) for optical OFDM was evaluated through simulation and experiment. We found that the signal degradation caused by quantization depends on the number of subcarriers theoretically, but the other noise generated in experiment suppresses the dependency. Additionally, signal degradation caused by quantization is independent of subcarrier modulation, and the performance improvement saturates with increasing bit resolution. With the criteria for the BER of 1  10-3, the required DAC resolution by simulation with ideal analog-digital-converter at receiver is 3 bits for QPSK, 4 bits for 8-QAM and 5 bits for 16-QAM and 32-QAM. From the experimental result, the required bit resolution is increased as 6 bits for 32-QAM. | |||||
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