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To: jghutchison who wrote (9296)	6/27/2000 10:14:00 AM
From: Stephen L	Read Replies (1) \| Respond to of 12623

Good article on DWDM filtering techniques fiberopticsonline.com{CA3F5DC1-4843-11D4-8C54-009027DE0829}&Bucket=HomeFeaturedArticles Filter technologies vie for DWDM system applications 6/22/2000 Network specifications have determined the choice of mux/demux technology in the past; now interleavers are allowing manufacturers to achieve narrower channel spacings with economical technology. By: Jerry Bautista and Robert Shine, Wavesplitter Technologies Inc. Contents Market perspective Comparing the technology Approaches to mux/demux Reliability testing Interleaving technology Sidebar: Coarse wavelength division multiplexing (CWDM) To meet bandwidth demand and make optimum use of existing amplifier bandwidth, dense wavelength division multiplexing (DWDM) systems must offer ever increasing channel counts at more and more narrow channel spacings. Systems deployed roughly two years ago features 16 channels with 200 GHz channel spacing in the C-band (1530 nm to 1560 nm). Systems to be deployed this year, on the other hand, use 40 channels or more with 50 GHz channel spacing. Although new amplifiers operate over a broader spectral range, channel density will not be any less in these new wavelength regions. Thus, multiplexer/demultiplexer (mux/demux) components are key elements in a successful network. A number of different DWDM technologies exist to meet the needs of system designers, but each forces a design tradeoffs in terms of narrowness of channel spacing, cost, reliability, and manufacturability. Now interleaver technology allows designers to achieve narrow channel spacing with mature technology.