Title :
A Complete 8-GHz QPSK-MODEM Featuring Novel Subcarrier and Data Synchronization for Optical Communications
Author :
Kourtessis, Pandelis ; Walker, Stuart D.
Author_Institution :
Essex Univ., Colchester
fDate :
5/1/2007 12:00:00 AM
Abstract :
We describe the application of subcarrier multiplexing (SCM) to enable broadband transmission beyond the modal bandwidth of multimode fiber (MMF) optical links. The application of a quadrature phase-shift keying modem featuring novel carrier and symbol-timing recovery circuits, demonstrates significant enhancement in channel capacity. By using a 2.7-GHz pilot-tone-injected phase-locked loop (PLL) and referencing subscriber data to a prescaled version of the subcarrier, zero-latency carrier and data synchronization has been achieved exhibiting 675 Mb/s bit-oriented clock extraction in network terminal equipments. The novel scheme is scalable to higher aggregate rates and upgrades to existing installed-base 50 mum MMF infrastructure to provide low-cost, high-capacity interconnects for storage area and campus network applications
Keywords :
channel capacity; optical fibre communication; optical modulation; optical phase locked loops; quadrature phase shift keying; subcarrier multiplexing; synchronisation; 2.7 GHz; 8 GHz; QPSK-modem; SCM; broadband transmission; channel capacity; data synchronization; modal bandwidth; multimode fiber optical links; optical communications; pilot-tone-injected phase-locked loop; quadrature phase-shift keying modem; subcarrier multiplexing; subcarrier synchronization; symbol-timing recovery circuits; Bandwidth; Channel capacity; Circuits; Clocks; Data mining; Modems; Optical fiber communication; Phase locked loops; Phase shift keying; Synchronization; Analog integrated circuits; modems; optical fiber communication; phase-locked loops (PLLs); quadrature phase- shift keying (QPSK); subcarrier multiplexing (SCM); synchronous detection;
Journal_Title :
Communications, IEEE Transactions on
DOI :
10.1109/TCOMM.2007.896048
