Abstract
Alamouti space-time block code (STBC) combined with a simple heterodyne coherent receiver enables phase diverse coherent detection without any optical polarization tracking. While such a system consisting of only a 3-dB coupler and a single balanced photodiode has been recently demonstrated using orthogonal frequency-division multiplexed (OFDM) signals, herein we report the first application to single-carrier systems. Applicability of such technique for single-carrier systems is not straightforward since specialized digital signal processing (DSP) algorithms are required for data recovery. In this paper, we address the implementing issues and DSP algorithms applicable for single-carrier (SC) Alamouti STBC based simplified heterodyne receivers. Polarization-insensitive operation of the proposed scheme and its performance are verified by means of simulation for a 12-Gbits/s quadrature phase-shift keying (QPSK) transmission system.
Highlights
Digital coherent receivers have caused a revolution in the design of optical core networks due to the ability of the linear field detection to facilitate digital mitigation of transmission impairments and the use of higher level modulation formats
The polarization-insensitive operation of such receiver has been proposed by using the Alamouti space-time block code (STBC), eliminating the requirement of optical polarization controller at the receiver [9]
Being a half-rate coding, introducing Alamouti STBC costs a 3-dB sensitivity penalty compare to a polarization division multiplexed (PDM) system operating at same bit rate; the receiver is significantly simplified which is one of the key concerns in a passive optical network (PON) applications
Summary
Digital coherent receivers have caused a revolution in the design of optical core networks due to the ability of the linear field detection to facilitate digital mitigation of transmission impairments and the use of higher level modulation formats. Being a half-rate coding, introducing Alamouti STBC costs a 3-dB sensitivity penalty compare to a polarization division multiplexed (PDM) system operating at same bit rate; the receiver is significantly simplified which is one of the key concerns in a passive optical network (PON) applications. This technique has been experimentally demonstrated using orthogonal frequency-division multiplexed (OFDM) signal transmission in a long-reach (LR) wavelength-division multiplexed (WDM) PON system [10].
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