Lasers, Fiber Optics, and Communications

Intensity modulation and direct detection Alamouti polarization-time coding for optical fiber transmission systems with polarization mode dispersion

[+] Author Affiliations
Ahmed Galib Reza, June-Koo Kevin Rhee

Korea Advanced Institute of Science and Technology, School of Electrical Engineering, 373-1 Guseong-dong, 305-701 Daejeon, Republic of Korea

Opt. Eng. 55(7), 076105 (Jul 18, 2016). doi:10.1117/1.OE.55.7.076105
History: Received April 4, 2016; Accepted June 27, 2016
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Abstract.  Alamouti space-time coding is modified in the form of polarization-time coding to combat against polarization mode dispersion (PMD) impairments in exploiting a polarization diversity multiplex (PDM) gain with simple intensity modulation and direct detection (IM/DD) in optical transmission systems. A theoretical model for the proposed IM/DD Alamouti polarization-time coding (APTC-IM/DD) using nonreturn-to-zero on-off keying signal can surprisingly eliminate the requirement of channel estimation for decoding in the low PMD regime, when a two-transmitter and two-receiver channel is adopted. Even in the high PMD regime, the proposed APTC-IM/DD still reveals coding gain demonstrating the robustness of APTC-IM/DD. In addition, this scheme can eliminate the requirements for a polarization state controller, a coherent receiver, and a high-speed analog-to-digital converter at a receiver. Simulation results reveal that the proposed APTC scheme is able to reduce the optical signal-to-noise ratio requirement by 3  dB and significantly enhance the PMD tolerance of a PDM-based IM/DD system.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Ahmed Galib Reza and June-Koo Kevin Rhee
"Intensity modulation and direct detection Alamouti polarization-time coding for optical fiber transmission systems with polarization mode dispersion", Opt. Eng. 55(7), 076105 (Jul 18, 2016). ; http://dx.doi.org/10.1117/1.OE.55.7.076105


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