Real-Time Single-Carrier Coherent 100 Gb/s PM-QPSK Field Trial

Abstract

Abstract-The development of 100 Gb/s transponder technology is progressing rapidly to meet the needs of next-generation optical/IP carrier networks. In this paper, we describe the upgrade of an installed 10 Gb/s field system to 100 Gb/s using a real-time single-carrier, coherent 100 Gb/s polarization-multiplexed quadrature-phase-shift keyed channel. Performance sufficient for error-free operation after forward-error-correction was achieved over installed 900 and 1800 km links, proving the viability of 100 Gb/s upgrades to most installed systems. Excellent tolerance to fiber polarization mode dispersion and narrowband optical filtering demonstrates the applicability of this technology over the majority of installed fiber plant and through existing 50 GHz reconfigurable optical add/drop multiplexers.Index Terms-Communication system performance, optical fiber communication, polarization multiplexing, quadrature phase-shift keying, signal processing.

Digital coherent optical communication systems: fundamentals and future prospects

“…However, recently, an application-specific integrated circuit (ASIC) designed for the 11.5-Gsymbol/s POLMUX QPSK signal has been developed [15], and the real-time operation of the digital coherent receiver at the bit rate of 46 Gbit/s has been demonstrated in the field by using such an ASIC [16]. More recently, real-time coherent receivers for 100-Gbit/s POLMUX QPSK signals have been demonstrated by using field-programmable gate arrays (FPGAs) [17]. It is now an urgent task to develop an ASIC for 100-Gbit/s POLMUX QPSK receivers.…”

High-Speed Coherent Transmission Using Advanced Photonics in Terahertz Bands

“…For the EIRP of 70 dBm under medium-and thick-fog conditions, the possible transmission distance achieved is approximately 400 m. These medium-and thick-fog conditions have water vapor densities of 0.05 g/m 3 and 0.5 g/m 3 , and the resulting additional losses to atmospheric attenuation are approximately 0.7 dB/km and 8 dB/km, respectively; the estimated visibilities under these fog conditions are 300 m and 50 m [48]. The drastic change in the atmospheric attenuation of 7 dB cannot affect the possible transmission distance for a distance less than 1 km; thus, the dominant loss in the terahertz band could be caused by the free-space path loss.…”

“…Traditionally, a high-speed connection has been established by a wireline connection: a copper telephone line and an optical fiber. From the viewpoint of advanced optical fiber communication technologies, the speed of the link in a single channel has achieved 100 Gb/s for metro and core networks, and now, 400-Gb/s/ch optical transport technology is being developed for next-generation high-capacity networks [1]- [3]. Additionally, in an access network, optical fiber cables are deployed to the home: a fiber-to-the-home (FTTH) scheme under a passive optical network configuration.…”

Benefits of elastic spectrum allocation in optical networks with dynamic traffic

“…Current coherent PDM-QPSK (Polarization-DivisionMultiplexed Quadrature Phase Shift Keying) transponders are able to transmit a 100 Gbit/s signal occupying about 28 GHz on the optical spectrum [9]. Therefore, considering traditional WDM systems with 50 GHz spaced channels (wavelengths), a bilateral guard-band of 11 GHz at each side is implicitly assumed to be used with current technology (see Fig.…”