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RF/Microwave??

10Gbps transmitters cover up to 300km

Posted: 31 Aug 2007 ?? ?Print Version ?Bookmark and Share

Keywords:10Gbps transmitters? DWDM optical transmitters? 300km long reach?

Finisar Corp. has announced the completion of Telcordia GR-468 qualification and general availability of its 10Gbps DM80 and DM200 narrowly tunable CMLTM Butterfly Transmitters for DWDM 300-pin transponders and telecom line card applications.

Leveraging the directly modulated Chirp Managed Laser (CML) technology recently acquired by Finisar, the DM80 and DM200 are said to be the world's first narrowly tunable 10Gbps transmitters to offer long reach and high output power in a 13-pin butterfly package.

Transmission distance and optical output power are important performance parameters of DWDM optical transmitters. For applications requiring the longest reach, the DM200 has an output power of 0-3dBm and transmits at 10Gbps over distances of 300km without requiring costly optical dispersion compensation. For applications requiring high output power, the DM80 can transmit distances up to 120km with an output power of 4-7dBm.

Narrow tunability is an important differentiator for OEMs developing transponders for DWDM networks. A 40-channel DWDM link using single-wavelength transmitters, for example, requires that OEMs keep an inventory of 40 different lasers. In addition to increased purchasing and inventory management complexity, large numbers of individualized lasers require a longer lead time to replace when inventories run low, forcing OEMs to maintain large component reserves.

Fully tunable transmitters, on the other hand, simplify inventory logistics but command the highest price since it requires the combination of an expensive fully tunable laser source and an external modulator. Narrowly tunable transmitters offer the best of inventory simplification and lower cost. Both the DM80 and DM200 transmitters offer narrow tunability at either 4-channel, 100GHz DWDM spacing or 8-channel, 50GHz DWDM spacing across both C-band and L-band, thus reducing the supply chain complexity by a factor of 4x or 8x compared to non-tunable sources.

Shipping now, DM80 and DM200 narrowly tunable CML butterfly transmitters are available in production volumes in both 4- and 8-channel spacing at base frequencies ranging from 186,700GHz to 196,100GHz.

- Henri Arnold
EE Times Europe




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