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Scalable Optical Multiplexer/Demultiplexer Modules
Aug 2004
Newport - New FocusRequest Info
SANTA ROSA, Calif., Aug. 12 -- Bookham Technology plc, a provider of optical components, modules and subsystems, has launched a new class of high-channel-count, scalable mulitplexer/demultiplexer products based on thin-film filter (TFF) technology for telecommunications applications.

Bookham said the modules ara low-entry-cost solution with full expandability of up to 40 channels in dense wavelength division multiplexing (DWDM) networks. The same module can be used in both multiplexing/demultiplexing and in reconfigurable optical add/drop (ROADM) applications. Upgrades can be handled in 8-10 channel increments in any wavelength order with minimal insertion loss increase.

"This is a major development in a market where world-class performance against cost is always an issue," said Dennis Derickson., Bookham's thin-film applications engineer.   

Optical filtering based on "banded architecture" arranges separate optical communications channels on a particular wavelength into groups and, instead of processing them one at a time, the filter processes the group, reducing overall footprint and optimizing device efficiency and cost, Bookham said.

Based on the company's proprietary AED III (advanced energetic deposition, version III) technology, a new class of banded filters called S skip 0" and ? skip 0" have been introduced for use in 100-GHz, channel-spacing DWDM systems.   These filters enable 8 or 10 channels at a time to be filtered without skipping, or sacrificing, the neighboring channels. This capability is more than double the level of typical four-channel versions.

Bookham's thin-film design team leader, Loren Stokes, said, "Four years ago, '4 skip 1' (i.e., four-channel filtering with the loss of one adjacent channel, due to signal degradation/interference at the filter's edge) banded filters were at the forefront of design. By 2002/2003, Bookham and other companies had introduced '4 skip 0' filters to the market, eliminating the need for skipped channels. ookham's latest introduction has achieved both '8 skip 0' and '10 skip 0' filters."

These new filters allow multiplexers and demultiplexers to be built with a simplified, flexible, and lower cost architecture. The products are now available and are being sampled by a number of customers.

For more information, visit:; e-mail:

Bookham Technology Inc.
3640 Westwind Boulevard
Santa Rosa, CA 95403
Phone: (707) 636-1100
Fax: (707) 636-1199


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Bookham TechnologyCommunicationsDWDMense wavelength division multiplexingMultiplexer/Demultiplexeroptical componentsProductsTFFthin-film filter

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