For experiments requiring up to 850 MHz (Model 1611) and 1 GHz (Model 1601) bandwidths and 500 ps rise times we recommend these fiber-optic receivers with a well-balanced combination of gain, bandwidth, and very low noise. The fiber-optic input works equally well with FC/PC-connectorized single-mode or multimode fiber. They have been engineered to eliminate most common sources of noise and drift, and have enough gain to pick up even very weak signals making them ideal optical front ends for systems requiring a low-noise input.
The Silicon model (1601) provides wavelength coverage from 320-1000 nm, and the InGaAs model (1611) provides coverage from 900-1700 nm. This enables wide bandwidth, low-noise detection of signals distributed over fiber-optic cables or found in high resolution spectroscopy, fiber-optic sensors, optical metrology, and many other applications.
Because of their high transimpedance gain and low noise-equivalent power (NEP), they offer the best in sensitivity for signals with rise and fall times as short as 0.5 ns. This high sensitivity, combined with their high-level output, reduces the effects of downstream noise sources.
These photoreceivers are AC-coupled with a low-frequency roll-off at 30 kHz. A convenient DC-photocurrent monitor output makes alignment easy. The monitor output has a 20-kHz bandwidth and a transimpedance gain of 10 V/mA.
Careful RF shielding and filtering of power-supply inputs eliminate electromagnetic interference, even in laboratories with Q-switched lasers and other noisy equipment.
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