Atlanta - Analog Devices Inc. came to the Optical Fiber Communication conference here last week with a new clock/data recovery chip and a pair of 10.7-Gbit/second external modulator drivers for continuous-wave lasers.
The ADN2812 continuous-tuning clock/data recovery device, priced at $54 each in 1,000-piece quantities, is said to accommodate current and future bit rate requirements for multiservice provisioning platforms. The data rate "read- back" feature lets the part lock on to any incoming data rate between 10 Mbits/s and 2.7 Gbits/s without the need for an external reference clock, while providing the acquired data rate frequency through the I2C port. It targets protocol- and data rate-agnostic equipment that operates over Ethernet and Sonet/SDH OC-1, 3, 12, 48 and associated FEC rates, and can also benefit wave-division multiplexing transponders, test equipment, backplanes, regenerators/repeaters, broadband cross-connects and routers, the company said.
The external modulator drivers for continuous-wave lasers are called the ADN2849 and ADN2859. The ADN2849 provides a 3-volt single-ended output to drive an electro-absorption modulator and the ADN-2859 provides a 6-V peak-to-peak differential output to drive a differential Mach-Zehnder modulator. Both dissipate 900 milliwatts (2-V swing, 1-V offset), which Analog Devices (Norwood, Mass.) says is typically one-third less than other solutions. Each is available as a 4 x 4-mm LFCSP package or as bare die. The packaged units are each priced at $107 in quantities of 1,000.
The ADN2812 CDR device is now sampling. The drivers will be available in sample quantities in the third quarter.
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