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Colorless

Light Reading
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Light Reading
11/9/2010
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Current-generation ROADMs are limited by fixed add/drop transceivers and wavelength assignments. When a wavelength is assigned, a transceiver must be physically connected to the correct mux-demux port at the add/drop site. Even if the transceiver is tunable, it still must be manually moved.

A colorless ROADM allows this process to be automated. But to achieve this, several wavelength-selective switches (WSSs) are needed at the add port. The number of WSSs used is set by the port count: For an 80-wavelength add, up to nine 1x9 WSSs are used. Higher-degree 1x23 WSSs will reduce the units needed while also potentially lowering the cost-per-port.

On the receiver (or 'drop') side, vendors use multiple WSS ports or power splitters. But with the emergence of tunable coherent receivers at 40 Gbit/s and 100 Gbit/s, colorless demultiplexing using a coherent receiver to select the desired channel is possible, simplifying the ROADM design.

Regardless of the architecture, the end result of a colorless design is that any wavelength (color) can be assigned to any port of the add/drop site using software, and without a technician having to be on site.

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ROADM
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ROADM,
User Rank: Light Beer
12/5/2012 | 4:18:35 PM
re: Colorless


The next one should be channel spacing independency.


So that no matter what the channel spacing is (50 GHz or 100 GHz) ADD or DROP can happen anytime.


Perhaps, tunable filter technology should be deployed then.


 

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