Fiber Optic Control

Analog Devices current mirrors are precision, high dynamic range, wide variable supply parts used for optical power monitoring, voltage biasing with current monitoring, and voltage-to-current conversion. Our current mirrors can monitor current down to as little as 3 nA and as much as 3 mA, with a linearity of 1% or better. The current dynamic range is 120 dB or 6 decades of current range, while the overcurrent protection feature in our devices forces the input pin to ground to avoid part damage. Over temperature (–40°C to +85°C) and process, the dynamic range only suffers 10 dB at the lower end of the range.

Analog Devices’ Logarithmic Transimpedance Amplifiers accurately convert an input current to a logarithmically (“linear in dB”) related output voltage over an exceptionally large dynamic range of up to 200dB (from 1pA to 10mA). The logarithmic response automatically provides dynamic range compression, without requiring any control circuitry. This significantly reduces the dynamic range requirements on post-processing circuitry such as analog-to-digital converters. Precision laser trimming applied to products such as ADL5304, AD8304 enables very high accuracy measurements with only minimal calibration required. ADI’s Logarithmic Transimpedance Amplifiers are used in a variety of applications including optical power measurement, wide range baseband logarithmic compression, measurement of current and voltage ratios, and optical absorbance measurements.

Analog Devices Thermoelectric Cooler Controllers work with cooler based photonics, offer the smallest size, the best efficiency and the most robust solutions. It has a linear power stage with the linear driver output and a pulse width modulation power stage with the SW output. Depending on the part number, it offers digital PID control or analog PID control or both. Our TEC controllers support a variety of MSA based optical modules such as SFP, SFP+,QSFP+, CFP/CFP-2/CFP-4 and QSFP28.