Analog Devices unveils 10.7-Gbit/sec laser diode driver with dual-loop control

January 14, 2001--Analog Devices Inc. today announced a 10.7-Gbit/sec Laser Diode Driver (LDD) with dual-loop control of both average power and extinction ratio. Operating at a 3.3, the ADN2843 also augments the power, integration, and cost advantages of directly coupled applications where the laser and laser driver are packaged together for maximum space and power benefits, claims the company.

Analog Devices Inc. today announced a 10.7-Gbit/sec Laser Diode Driver (LDD) with dual-loop control of both average power and extinction ratio. Operating at a 3.3, the ADN2843 also augments the power, integration, and cost advantages of directly coupled applications where the laser and laser driver are packaged together for maximum space and power benefits, claims the company.

According Analog Devices, the ADN2843 is the first OC-192/SDH-64 and 10 Gigabit Ethernet (GbE)-compatible laser diode driver with closed loop control of both average power and extinction ratio, providing consistent optical performance by compensating for temperature variations and aging effects in the laser diode.

The ADN2843 maintains consistent laser diode performance by continuously sensing the optical output and correcting it for variations caused by changes in operating temperature and laser diode degradation, claim company representatives. Overall transmitter performance is improved with reduced design time, board real-estate, component and manufacturing cost, which is especially important in uncooled applications, and those that require long-term stability and reliability.

The ADN2843 is optimized for applications where a laser driver and laser diode are co-packaged. The ADN2843 couples directly to the laser diode, providing the benefits of decreased cost, size, and power while significantly reducing pattern-dependent jitter that occurs in standard ac-coupled designs. The proprietary driver topology of the ADN2843 offers the added benefit of operation from a 3.3-V power supply while maintaining key driver parameters such as high-modulation current. The ADN2843 features modulation and bias currents of up to 80 mA. Additional capabilities include laser fail and degrade alarms, automatic laser shutdown (ALS), bias current monitors, and modulation current monitors.

The ADN2847 laser diode driver is priced at $130 in 1,000 piece quantities. For product availability and more information, visit Analog Devices' (Norwood, MA) Web site at www.analog.com/ADN2843.

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