The WaveStar™ BandWidth Manager (BWM) is Lucent Technologies' flagship product
platform for providing bandwidth management within network nodes. It provides broadband
(OC‐3/12/48/192 and STM‐1/4/16/64), asynchronous transfer mode
(ATM), and Internet protocol (IP) bandwidth management within a highly‐integrated,
scalable, single network element. The WaveStar BWM's broadband synchronous transfer mode (STM)
fabric scales from 1152 STS‐1/384 STM‐1 (60 Gb/s) to 9216 STS‐1/3072
STM‐1 (480 Gb/s) port capacity. With such a high range in capacity scalability across the
broadband STM fabric, the BWM can be sized to meet most carriers' growth projections while protecting them
from unforeseen growth within network nodes. The WaveStar BWM also addresses the growing need for enhanced
bandwidth management capabilities within central offices. It integrates all access and transport facilities within
a network node and efficiently manages bandwidth among these facilities via a cost‐effective, scalable,
multiservice switching architecture. The BWM facility interfaces, which feature integrated self‐healing
rings, eliminate the need for stand‐alone add/drop multiplexer (ADM) ring terminals in the
central office. Furthermore, the switching architecture, which includes an STM fabric as well as ATM and IP
functionality, replaces the need for stand‐alone broadband digital cross‐connect systems
(BDCSs) and ATM and IP core switches/routers. The WaveStar BWM also supports direct integration of
Lucent's dense wavelength division multiplexing (DWDM) systems—the WaveStar optical line
system (OLS) 400G and the WaveStar OLS 40G.
We present an experimental and theoretical study on the crosstalk in a two-channel ASK heterodyne detection system where the effect of laser phase noise is negligible. Three r d t s are described: 1) the dependence of the crosstalk penalty on thQratb of chandel separation to bit rate and on the optical power level of the image band, 2) comparison of the measured crosstalk penalties with the ones obtained from a simple model, and 3) the effect of electrical preiiltering on the crosstalk penalty. The main conclusions are: 1) the ChaMel separation can he as low as four times the bit rate without incurring any crosstalk penalty as long as the optical power of the image band is comparable to the optical power of the desired channel and 2) electrical premtering of the trammitted signals significantly reduces the crosstalk penalty in multichannel ASK heterodyne systems where the effed of laser phase noise is negligible.
The understanding of guided wave switching devices and optical switching system needs has matured such that it is appropriate to consider optimum system architectures and optimum device topology(1,2,3). Here we report switch modules which simultaneously optimize these constraints. We first describe an architecture that deals with the constraints of guided wave photonic switch arrays. Then we discuss the design, fabrication and testing of the switch modules utilized in this architecture.
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