Simplified carrier recovery for intradyne optical PSK receivers in udWDM-PON
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Rights accessOpen Access
We present an optimized carrier recovery architecture based on differential detection for coherent optical receivers that substantially reduces the required DSP hardware resources, aimed at cost-effective transceivers for access networks applications. The proposed architecture shares the 1-symbol complex correlation required for differential phase detection within both the frequency estimation and the phase recovery blocks of the receiver DSP, thus lowering the energy consumption of the digital coherent receiver and increasing the tolerance against fast wavelength drifts of the lasers. We prototyped the proposed carrier recovery in a commercial field-programmable gate array (FPGA) for real-time evaluation with differential phase shift keying (DPSK) data at 1.25 Gb/s. The optical transmission system implemented direct-phase modulation of commercial DFB lasers, 25 km of single-mode fiber, and a coherent intradyne receiver with low-cost optical front-end based on 3×3 coupler and three photodiodes providing phase-diversity operation. Results show high performance in real time for DPSK, achieving -55 dBm sensitivity at BER = 10 -3 in a 6.25 GHz spaced ultra-dense wavelength-division multiplexing grid, high tolerance to optical phase noise, and enhanced mitigation of the fast wavelength drifts from lasers enabled by feedforward DSP correction and feed-back local oscillator automatic tuning.
©2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
CitationTabares, J., Ghasemi, S., Polo, V., Prat, J. Simplified carrier recovery for intradyne optical PSK receivers in udWDM-PON. "Journal of lightwave technology", 28 Abril 2018, vol. 36, núm. 14, p. 2941-2947.
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder