Title :
A 20-Gb/s Quadrature Phase-Shift-Keying Real-Time Coherent System Based on a Subcarrier Optical Phase-Locked Loop
Author :
Torrengo, Enrico ; Ferrero, Valter ; Camatel, Stefano
Author_Institution :
Dipt. di Elettron., Politec. di Torino, Torino, Italy
Abstract :
A 20-Gb/s quadrature phase-shift keying (QPSK) homodyne coherent system was analyzed and experimentally demonstrated. This system is based on subcarrier optical phase-locked loop (SC-OPLL) and it works in real time. In this letter, we present a brief optical receiver analysis and the transmission system performance in terms of simulations and experimental results. We also show that the QPSK system works but it is affected by loop propagation delay effects due to the prototypal implementation. The delay loop effects can be mitigated by an SC-OPLL integrated realization.
Keywords :
homodyne detection; integrated optics; optical phase locked loops; optical receivers; optical transmitters; quadrature phase shift keying; real-time systems; QPSK homodyne coherent system; SC-OPLL integration; bit rate 20 Gbit/s; delay loop effect mitigation; loop propagation delay effect; optical receiver analysis; prototypal implementation; quadrature phase-shift-keying real-time coherent system; subcarrier optical phase-locked loop; transmission system performance; Homodyne detection; optical phase-locked loops (OPLLs); quadrature phase-shift keying (QPSK);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2009.2025388
