Investigation of 2-b/s/Hz 40-Gb/s DWDM Transmission Over 4>tex<$,times,$>/tex<100 km SMF-28 Fiber Using RZ-DQPSK and Polarization Multiplexing

Integrated Optical Coherent Balanced Receiver

“…This is attributed to the frequency response of the ICR beyond 10 GHz and the high insertion loss of the VDL in contrast to the case of 8-GSym/s DBPSK error-free detection, which did not require a VDL. Nevertheless, with advanced forward-error-correction (FEC) coding, a corrected BER less than 10 -12 is expected for 20 Gb/s aggregated data rate since the symbol rate included 25% overhead bandwidth [2]. The received power required for uncorrected BER of 10 -3 (FEC threshold) is about -34 dBm including insertion loss of the VDL.…”

“…The received power required for uncorrected BER of 10 -3 (FEC threshold) is about -34 dBm including insertion loss of the VDL. As a comparison, the ICR was replaced with discrete components (DCs): a packaged 6-port LiNbO 3 optical hybrid (excess loss: -3.7 dB) and a commercial 15-GHz balanced photoreceiver [2]. BER performance using DCs is also shown in Fig.…”

“…The optical hybrid combines the signal and a local laser before mixing at the photodetectors. An integrated LiNbO 3 based optical hybrid has been previously reported and shown to be a robust device for homodyne [1] as well as differential detection [2]. As the signal's symbol rate increases, tolerance of path length mismatch in the connecting optical fibers between the optical hybrid and the balanced detectors reduces [1].…”

Fieldable Digital Coherent Interferometric Communication and Sensing Application Domains

“…Furthermore, for improved security and flexibility, this approach does not require a fixed DWDM-like channel structure, but instead takes advantage of contiguous gridless selection of any optical carrier frequency based on the atmospheric conditions and tactical operational needs as described in [1]. High spectral efficiency fiber based coherent communications utilizing our components are described in [3], [4] and an OCDMA approach in [5]. By co-locating the synthesizer and analyzer and sharing a common optical local oscillator one can design interferometric sensing applications such as Coherent LADAR or Vibrometery using a common layered architecture with the unique ability to switch applications via software control.…”

Centralized transmission techniques for full-duplex reconfigurable WDM optical access networks

“…In this context, up to 1.6 b/s/Hz spectral efficiency and 10 Tb/s aggregate capacity has been achieved [Sot 2002]. During the last decade and also thanks to the employment of highly spectrally efficient modulation formats, such as differential quadrature phase shift keying (DQPSK) and multilevel quadrature amplitude modulation (M-QAM), a wide series of laboratory experiments and record-breaking improvements up to 11 b/s/Hz of spectral efficiency and 69.1 Tb/s of aggregate capacity, have followed one after the other in order to target the single-wavelength 100 Gb/s transport and facilitate the use of digital signal processing at lower symbol rates [Wre 2003, Cho 2004, Mil 2005, Gna 2006, Flu 2008, Gav 2010. Further investigations on DWDM transmission using PolMUX in combination with OFDM are reported in [Tak 2010, Ami 2010, Sch 2010.…”