Multi-Carrier Coherent Receiver Based on a Shared Optical Hybrid and a Cyclic AWG Array for Terabit/s Optical Transmission
ABSTRACT We describe a multi-carrier coherent-receiver scheme where the coherent beating between an ultra-high-speed multi-carrier signal and multiple optical local oscillators (OLOs) is conducted in a single optical hybrid, followed by carrier separation through an arrayed waveguide grating (AWG) array. Sharing the optical hybrid for multiple OLOs simplifies the coherent receiver complexity and eases the timing alignment among multiple modulated carriers. Based on this scheme, a compact coherent-receiver front end consisting of an integrated 4 ?? 40 AWG array following a polarization-diversity optical hybrid is demonstrated and used for complete demodulation of a 1.12-Tb/s multi-carrier signal having ten 112-Gb/s polarization-division multiplexed (PDM)-quadrature phase-shift keying (QPSK) carriers spaced at 50 GHz. The required optical signal-to-noise ratio for the 1.12-Tb/s signal is 27 dB at 10-3 bit error ratio. The cyclic feature of the AWG array allows the receiver to receive modulated carriers that are not adjacently spaced. We also extend this receiver scheme for multi-carrier signals whose carriers are closely spaced, e.g., under the orthogonal frequency-division multiplexing (OFDM) condition, for high-spectral-efficiency Terabit/s transmission applications.
- SourceAvailable from: ee.unimelb.edu.au[show abstract] [hide abstract]
ABSTRACT: There has been growing interest in coherent optical orthogonal frequency- division multiplexing (CO-OFDM). We aim to present the case that the time for CO-OFDM has come, in terms of the demand from today's ever-advancing optical networks and the availability of its underlying technologies. We first lay out the signal processing aspect for CO-OFDM and then show a 22 multiple-input-multiple-output (MIMO) OFDM representation for the single- mode fiber optical channel. Through numerical simulation and experimental demonstration, we further present and discuss various MIMO-OFDM systems focusing on their polarization-mode dispersion resilience. Among those sys- tems, the 21 MIMO-OFDM configuration incorporating polarization-time coding shows promise for optical access networks and broadcast networks. Fi- nally, another class of the frequency-domain equalization techniques, namely, incoherent or coherent optical single-carrier frequency-domain equalization (CO-SCFDE) is discussed and experimentally demonstrated. © 2008 Optical Society of America OCIS codes: 060.0060, 060.1660, 060.5060.Journal of Optical Networking 01/2008; 7(3). · 1.08 Impact Factor
- [show abstract] [hide abstract]
ABSTRACT: We have generated single-wavelength channel 8-PSK and 16-QAM RZ-data signals up to 5.1 Tb/s and subsequently extracted the time-division base rate channel using an ultrafast coherent receiver with time-division demultiplexing function and digital BER post-processing.Optical Fiber Communication - incudes post deadline papers, 2009. OFC 2009. Conference on; 04/2009
- [show abstract] [hide abstract]
ABSTRACT: 1-Tb/s per channel coherent optical OFDM transmission over 600-km SSMF fiber is demonstrated assisted with a recirculating frequency shifter. Record spectral efficiency and transmission reach is achieved at 1-Tb/s channel rate without Raman amplification.03/2009;