%0 Journal Article
%T DP-DQPSK Optical Access System Integrated with Fiber and Free-Space Downlink for High Spectral Efficiency Application
%A Yufeng Shao
%A Fuping Chen
%A Luo Chen
%A Shilu Shen
%A Anrong Wang
%A Yingxiang Luo
%A Zefu Tan
%J Optics and Photonics Journal
%P 108-113
%@ 2160-889X
%D 2016
%I Scientific Research Publishing
%R 10.4236/opj.2016.68B018
%X <div style=\"text-align:justify;\">
	<span style=\"line-height:1.5;\">In this letter, we present the generation, the balanced detection, and the transmission performance evaluation of dual polarization differential quadrature phase shift keying (DP-DQPSK) signals in optical access system integrated with fiber and free-space downlink. Polarization-multip- lexed (POLMUX) technique is introduced in the system for high spectral efficiency access utilization. 10 Gb/s DP-DQPSK downlink signals are successfully transmitted over 50 km SMF-28 and a 800 m wireless optical channel under the bad weather condition, such as fog and haze. The results show that the potentiality of DP-DQPSK optical access system is integrated with fiber and free- space downlink for providing flexible user access with high bandwidth efficiency.</span>
</div>
%K Free-Space Optical Communication
%K Optical Access System
%K Phase Modulation
%K Spectral Efficiency
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=70311