ROADMs & Wavelength Management

Single Wavelength Selective Switch (WSS)

10WSAA09FLL (Standard Profile) / FWS0109BHCFDL (Low Profile)

The application of Reconfigurable Optical Add/Drop Multiplexers (ROADM) in DWDM optical networks has expanded in recent years to support increasingly higher data rates and cost-effective replacement of point-to-point links with highly meshed all-optical networks, leading to increasingly longer switch cascades with minimal optical-electrical-optical conversion. Flexgrid® technology is now essential in the efficient use of optical bandwidth for extremely high data rates and advanced modulation formats employed by next generation DWDM transmitters/receivers, including 400 Gb/s and 1 Tbit/s signals of the future. These higher data rates require that channel spacing is flexible and can be increased real-time to allow the network to adapt to new transmission formats. Deployment of colorless (C) and colorless directionless (CD) ROADMs is facilitated by broadcast & select (B&S) ROADMs that require only one WSS per direction, maximizing cascaded performance. Single WSS modules can also be used in C and CD Add/Drop structures.

Enabled by Finisar Liquid Crystal on Silicon (LCoS) technology, Finisar single WSS products support Flexgrid® technology, which provides dynamic control of the channel width. Furthermore, once deployed, channel plans are configurable ‘on-the-fly’, meaning that channel bandwidths can be adjusted to most efficiently carry future demand as it arises. Furthermore, Flexgrid® offers full backwards compatibility with both the standard 100 GHz and 50 GHz ITU grids.

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