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Egorov R.,Verizon Laboratories
National Fiber Optic Engineers Conference, NFOEC 2013

Next Generation ROADM design that supports Colorless Directionless and Contentionless (CDC) architecture and supports Flexible grid is described. Benefits of CDC Flexible grid ROADM architecture are discussed. Tradeoffs between different aspects of design are presented. © 2013 Optical Society of America. Source

Magarini M.,Polytechnic of Milan | Essiambre R.-J.,Alcatel - Lucent | Basch B.E.,Verizon Laboratories | Ashikhmin A.,Alcatel - Lucent | And 2 more authors.
IEEE Photonics Technology Letters

The use of trellis-coded modulation (TCM) in combination with an outer block code is considered for next-generation 100-Gb/s optical transmission systems. Two block codes are employed as an outer code: a 16 times interleaved byte-oriented (255,239) Reed Solomon (RS) code and a code consisting of two interleaved extended three-error correcting Bose Chaudhuri Hocquenghem (BCH) (1020,988) codes. Simulations show that soft-decision decoding of a selected TCM inner code in combination with hard-decision decoding of the outer RS code achieves a net coding gain (NCG) of 8.42 dB at a bit-error rate of 10 -13. When the concatenated code based on the two interleaved BCH codes is used as the outer code, the NCG is 9.7 dB. The impact of quantization on the performance of the concatenated TCM scheme with the two interleaved BCH outer codes is evaluated, and it is shown that 4-bit quantization is sufficient to approach the infinite precision performance to within 0.15 dB. © 2006 IEEE. Source

Conway A.E.,Verizon Laboratories
IEEE/ACM Transactions on Networking

A fast simulation technique based on importance sampling is developed for the analysis of path service availability in mesh networks with dynamic path restoration. The method combines the simulation of the path rerouting algorithm with a dynamic path failure importance sampling (DPFS) scheme to estimate path availabilities efficiently. In DPFS, the failure rates of network elements are biased at increased rates until path failures are observed under rerouting. The simulated model uses failure equivalence groups, with finite/infinite sources of failure events and finite/infinite pools of repair personnel, to facilitate the modeling of bidirectional link failures, multiple in-series link cuts, optical amplifier failures along links, node failures, and more general geographically distributed failure scenarios. The analysis of a large mesh network example demonstrates the practicality of the technique. © 2010 IEEE. Source

Detwiler T.F.,Georgia Institute of Technology | Searcy S.M.,Georgia Institute of Technology | Ralph S.E.,Georgia Institute of Technology | Basch B.,Verizon Laboratories
Journal of Lightwave Technology

Advances in photonics, silicon electronics and digital signal processing (DSP) have converged to enable highly efficient transmission across fiber optic channels. Single wavelength data rates of 112 Gb/s are sought for wide deployment based on QPSK transmission, coherent detection, and digital demodulation. Here we examine continuous phase modulation (CPM) as a means to enhance performance and reach of coherent optical links. We quantify the robustness of the constant amplitude CPM format to spectral filtering and nonlinearities in comparison to QPSK. The challenges of generating and receiving the CPM waveform are considered and a novel CPM transmitter architecture is proposed. © 2011 IEEE. Source

Rahn J.,Infinera Corporation | Sun H.,Infinera Inc. | Wu K.-T.,Infinera Inc. | Basch B.E.,Verizon Laboratories
Journal of Lightwave Technology

We present real-time polarization mode dispersion (PMD) tolerance measurement results with a commercially available 500 Gb/s coherent modem. The first- and second-order PMD space is explored, showing that peak values of 500 ps of static, first-order PMD (differential group delay) have small penalties. The system was stressed using fast scrambling, with polarization change of over 10000 rad/s, along with high mean PMD. Penalties were small with sufficient equalization. © 1983-2012 IEEE. Source

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