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 624 MHz and 10 MHz) under weak turbulence is almost 3 times larger than that under strong turbulence.
Highlights
The volume of data traffic continues to increase due to the demand of subscribers for multimedia services that require the access network to support high data rates at any time, in any place inexpensively
We show two examples of practical laser diode (LD) with ∆ν=10MHz and ∆ν=624MHz, which correspond to typical values of a DFB LD and a FP LD, respectively
The numerical results show that the difference of average bit error rate (BER) corresponding to two LDs under
Summary
The volume of data traffic continues to increase due to the demand of subscribers for multimedia services that require the access network to support high data rates at any time, in any place inexpensively Systems have been good candidates for generation broadband services since FSO systems support large bandwidth, unlicensed spectrum, excellent security, and quick and inexpensive setup [1]. In spite of these advantages, the performance of FSO systems can be unreliable due to atmospheric turbulence. Numerical results are provided to illustrate the degradation of performance according to the depth of scintillation and LD linewidth
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