Product category:
Power Supply ICs and Controllers
News Release from: Analog Devices | Subject: ADN2843
Edited by the Electronicstalk Editorial
Team on 06 February 2002
Dual-loop control aids 10Gbit laser
diode driver
Analog Devices has released the first 10.7Gbit/s laser diode driver (LDD) to include dual-loop control.
Analog Devices has released the first 10.7Gbit/s laser diode driver (LDD) to include dual-loop control The dual-loop control of both average power and extinction ratio provides consistent optical performance by compensating for temperature variations and aging effects in the laser diode
This article was originally published on Electronicstalk on 2 Jul 2008 at 8.00am (UK)
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Operating at a 3.3V supply voltage, the ADN2843 also augments the power, integration and cost advantages of directly coupled applications - those where the laser and laser driver are packaged together for maximum space and power benefits, such as small form factor (SFF) modules - without sacrificing driver performance.
"Together, our unique dual-loop architecture and proprietary driver topology enable designers to quickly and cost-effectively implement a high-performance solution at significant space and power savings", said Peter Real, product line director, High Speed Networking Group, Analog Devices.
"These benefits are essential for the metro/access arena, especially for 10GbE modules, where cost, size and power are at a premium, and an accelerated time-to-market is fundamental for success".
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The ADN2843 is the first OC-192/SDH-64 and 10GbE-compatible laser diode driver with closed loop control of both average power and extinction ratio.
The ADN2843 actively 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.
Overall transmitter performance is improved with reduced design time, board real estate, component and manufacturing cost.
This feature is especially important in uncooled applications, and those that require long-term stability and reliability.
The ADN2843 is optimised for applications where a laser driver and laser diode are copackaged.
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 3.3V power supply while maintaining key driver parameters such as high-modulation current.
The ADN2843 features modulation and bias currents of up to 80mA.
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 $130.00 in 1000 piece quantities.
Analog Devices' family of laser diode drivers are the only LDDs that offer dual-loop architecture with datarates from 50Mbit/s to 10.7Gbit/s for 3.3 and 5V applications.
Design engineers can quickly and cost-effectively implement optimal designs for long-term stability and reliability.
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