A new +3,3 V laser driver designed for multirate transceiver modules with data rates from 155 Mbps to 2,7 Gbps has been released by Maxim. Lasers can be DC-coupled to the MAX3737 for reduced component count and ease of multirate operation.
Laser extinction ratio control (ERC) combines the features of automatic power control (APC), modulation compensation, and built-in thermal compensation. The APC loop maintains constant average optical power. Modulation compensation increases the modulation current in proportion to the bias current. These control loops combined with thermal compensation maintain a constant optical extinction ratio over temperature and lifetime.
The MAX3737 accepts differential data input signals. The wide 5 to 60 mA (up to 85 mA AC-coupled) modulation current range and up to 100 mA bias current range makes the MAX3737 ideal for driving FP/DFB lasers in fibre-optic modules. External resistors set the required laser current levels.
The MAX3737 is offered in 5 x 5 mm 32-pin thin QFN and QFN packages and operates over the -40 to +85°C extended temperature range.
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