Fiber optics communications; (230.7405) Wavelength conversion devices; (130.3730) Lithium niobate

Abstract: We present the results of an in-depth experimental investigation about all-optical wavelength conversion of a 100-Gb/s polarization-multiplexed (POLMUX) signal. Each polarization channel is modulated at 25 Gbaud by differential quadrature phase-shift keying (DQPSK). The conversion is realized exploiting the high nonlinear χ ©2009 Optical Society of Americ

Electrical PMD compensation in 43-Gb/s POLMUX-NRZ-DQPSK enabled by coherent detection and equalization

PMD compensation using coherent equalization is demonstrated experimentally. Using 43-Gb/s polarization-multiplexed NRZ-DQPSK, we show compensation of practically arbitrary amounts of DGD (>200ps) and CD with negligible penalty, even in the presence of PDL and SOPMD

Carrier phase estimation for coherent equalization of 43-Gb/s POLMUX-NRZ-DQPSK transmission with 10.7-Gb/s NRZ neighbours

We show the influence of 10.7-Gb/s NRZ neighbors on 43-Gb/s polarization-multiplexed NRZ-DQPSK transmission combined with digital coherent equalization. The impact of XPM induced phase noise is reduced with an optimized carrier phase estimation (CPE) algorithm

Coherent equalization versus direct detection for 111-Gb/s ethernet transport

We discuss coherent equalization to realize robust 111-Gb/s transmission. For 111-Gb/s POLMUX-RZDQPSK we experimentally show the advantage of coherent equalization over direction detection for compensation of both chromatic dispersion and differential group delay

Impairment tolerance of 111 Gbit/s POLMUX-RZ-DQPSK using a reduced complexity coherent receiver with a T-spaced equaliser

The tolerance to narrow spectral filtering in presence of chromatic dispersion is investigated for 111Gbit/s POLMUX-RZ-DQPSK. It is shown that the use of T-spaced equalisers is enabled by appropriate electrical filtering

Coherent equalization versus direct detection for 111-Gb/s ethernet transport

We discuss coherent equalization to realize robust 111-Gb/s transmission. For 111-Gb/s POLMUX-RZDQPSK we experimentally show the advantage of coherent equalization over direction detection for compensation of both chromatic dispersion and differential group delay

10 x 111 Gbit/s, 50 GHz spaced, POLMUX-RZ-DQPSK transmission over 2375 km employing coherent equalisation

We demonstrate spectrally efficient (2.0 b/s/Hz) transmission of 10 x 111 Gbit/s polarisation multiplexed 27.75 Gbaud RZ-DQPSK over 2375km of SSMF and 5 add-drop nodes. Coherent equalisation enables polarisation recovery and high chromatic dispersion tolerance

Carrier phase estimation for coherent equalization of 43-Gb/s POLMUX-NRZ-DQPSK transmission with 10.7-Gb/s NRZ neighbours

We show the influence of 10.7-Gb/s NRZ neighbors on 43-Gb/s polarization-multiplexed NRZ-DQPSK transmission combined with digital coherent equalization. The impact of XPM induced phase noise is reduced with an optimized carrier phase estimation (CPE) algorithm

Coherent equalization and POLMUX-RZ-DQPSK for robust 100-GE transmission

We discuss the use of a coherent digital receiver for the compensation of linear transmission impairments and polarization demultiplexing in a transmission system compatible with a future 100-Gb/s Ethernet standard. We present experimental results on the transmission performance of 111 Gbit/s POLMUX-RZ-DQPSK. For a dense WDM setup with channels carrying 111 Gbit/s with a 50 GHz channel spacing (2.0 bits/s/Hz), we show the feasibility of 2375 km transmission. This is enabled through coherent detection which results in excellent noise performance, and subsequent electronic equalization which provides the high tolerance to polarization mode dispersion and chromatic dispersion (CD). Furthermore, we discuss the impact of sampling and digital signal processing with either 1 or 2 samples/bit. We show that when combined with low-pass electrical filtering, 1 sample/bit signal processing is sufficient to obtain a large tolerance towards CD. The proposed modulation and detection techniques enable 111 Gbit/s transmission that is directly compatible with the existing 10 Gbit/s infrastructure. © 2007 IEEE

Photonik - Optische Kommunikationssysteme (Hochbitratenuebertragung). Teilvorhaben: Demonstrator fuer ein 4x10Gbit/s-TDM-Uebertragungssystem Abschlussbericht

During the development of the demonstrator for 40 Gbit/s transmission theoretical work and simulations have been performed as well as the development of the corresponding hardware. For theoretical studies a tool for simulation of optical transmission systems has been improved and enhanced in simulation capabilities. Using this tool the investigation of different physical transmission effects like polarization mode dispersion have been possible. Furthermore a flexible modular link design has been developed, showing a minimization of interaction of dispersion and self phase modulation. The realization of this design is based on a balances combination of precompensation and postcompensation of the chromatic dispersion. In the field of hardware realization on the one hand side a demonstrator for 20 Gbit/s transmission multiplexing 4 data streams of 5 Gbit/s has been built up. With this demonstrator several types of dispersion compensation have been investigated. The experience from this work has been used to realize the 40 Gbit/s demonstrator setup. Difficulties in the field of signal strength and stability of operation disabled the test of the complete system. The successful test of the components however demonstrate the validity of the concept. The realization was based on the GaAs chips developed by our project partner IAF (Fraunhofer Institut fuer angewandte Festkoerperphysik). (orig.)Available from TIB Hannover: DtF QN1(68,12) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman