Title :
Investigation of 2-b/s/Hz 40-gb/s DWDM transmission over 4×100 km SMF-28 fiber using RZ-DQPSK and polarization multiplexing
Author :
Cho, Pak S. ; Harston, Geof ; Kerr, Chris J. ; Greenblatt, A.S. ; Kaplan, Arkady ; Achiam, Yaakov ; Levy-Yurista, Guy ; Margalit, Moti ; Gross, Yoav ; Khurgin, Jacob B.
Author_Institution :
CeLight Inc., Silver Spring, MD, USA
Abstract :
We have investigated transmission of 14×40 Gb/s dense wavelength-division-multiplexing channels with 20-GHz spacing over 4×100 km of SMF-28 fiber. A spectral efficiency of 2 b/s/Hz was demonstrated by 4-b (8-state) per-symbol coding using return-to-zero differential quadrature phase-shift keying (RZ-DQPSK) and polarization multiplexing using polarization bit interleaving. All 12.5-Gsymbols/s transmitted channels included 25% overhead bandwidth reserved for forward-error correction (FEC) and showed uncorrected bit-error rate below the FEC threshold required for error-free operation. Demodulation of the RZ-DQPSK signal at the receiver was achieved using a fiber-based asymmetric Mach-Zehnder interferometer as well as a packaged integrated lithium niobate optical 90° hybrid.
Keywords :
Mach-Zehnder interferometers; demodulation; differential phase shift keying; error statistics; forward error correction; lithium compounds; optical fibre communication; wavelength division multiplexing; LiNbO3; Mach-Zehnder interferometer; RZ-DQPSK; SMF-28 fiber; demodulation; dense wavelength-division-multiplexing channels; forward-error correction; lithium niobate optical 90° hybrid; per-symbol coding; polarization bit interleaving; polarization multiplexing; return-to-zero differential quadrature phase-shift keying; spectral efficiency; uncorrected bit-error rate; Bandwidth; Bit error rate; Demodulation; Error-free operation; Forward error correction; Interleaved codes; Optical fiber polarization; Optical receivers; Phase shift keying; Wavelength division multiplexing;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2003.821272
