Symmetric carrier assisted differential detection receiver with low complexity signal signal beating interference mitigation.
Low cost, spectrally efficient self coherent detection capable of optical field recovery is desired for inter data center connections and metro networks. In this work, a simplified symmetric carrier assisted differential detection (S CADD) receiver structure is proposed, which removes the single ended photodiode branch and saves one ADC in standard asymmetric CADD (A CADD) receivers. To compensate for the signal signal beating (SSBI) impairment, a low complexity iterative SSBI mitigation algorithm is put forward as well. The computational complexity is reduced by moving equalization, de modulation and modulation out of each iteration. Based on single carrier twin single sideband (SSB) pulse and quadrature amplitude modulation (PAM and QAM) signals, the OSNR sensitivity with different carrier to signal power ratios (CSPRs) at back to back (BTB) scenario, the bit error rates (BER) performance after 1000km fiber transmission, and the received optical power sensitivity at BTB are theoretically and numerically compared for both S CADD and A CADD receivers, respectively.
Optics express