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BER performance analysis of radio over free-space optical systems considering laser phase noise under Gamma-Gamma turbulence channelsGamma Gamma 터뷸런스 채널하에서 레이져 위상 잡음을 고려한 FSO 시스템의 BER 성능 분석에 관한 연구
- Other Titles
- Gamma Gamma 터뷸런스 채널하에서 레이져 위상 잡음을 고려한 FSO 시스템의 BER 성능 분석에 관한 연구
- Issue Date
- 1-3월-2009
- Publisher
- OSA
- Keywords
- FSO; optical communication; BER; RoF; Phase noise
- Citation
- Optics Express, v.17, no.6, pp 4479 - 4484
- Pages
- 6
- Journal Title
- Optics Express
- Volume
- 17
- Number
- 6
- Start Page
- 4479
- End Page
- 4484
- ISSN
- 1094-4087
- Abstract
- This paper analytically investigates a bit error rate (BER) performance of radio over free space optical (FSO) systems considering laser phase noise under Gamma-Gamma turbulence channels. An external modulation using a dual drive Mach-Zehnder modulator (DD-MZM) and a phase shifter is employed because a DD-MZM is robust against a laser chirp and provides high spectral efficiency.We derive a closed form average BER as a function of different turbulence strengths and laser diode (LD) linewidth, and investigate its analytical behavior under practical scenario. As a result, for a given average SNR with normalized perturbation, it is shown that the difference of average BER corresponding to two LDs (with linewidth of 624MHz and 10MHz) under weak turbulence is almost 3 times larger than that under strong turbulence.
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