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Optical Receiver, Silicon, 300-1050 nm, 200 kHz Bandwidth, 8-32
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In Stock
Optical Receiver, Silicon, 300-1050 nm, 200 kHz Bandwidth, M4
2 Weeks
2 Weeks
Optical Receiver, 900-1700 nm InGaAs Detector, 200 kHz Bandwidth, 8-32
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In Stock
Optical Receiver, 900-1700 nm InGaAs Detector, 200 kHz Bandwidth, M4
In Stock
In Stock



High Speed Receiver Physics

With the advancement of high-transmission-rate systems and short-pulse lasers, many applications now require high time-resolution or equivalently, high frequency-bandwidth optical detection. High-speed photoreceivers are critical for the measurement of the frequency and/or time response of optical systems. In the optical domain, this can include measuring the pulses of mode-locked laser systems, detecting the data stream of a frequency-multiplexed communication system, or providing increased resolution in dynamic, pump-probe spectroscopy. The minimum rise time for high-speed photoreceivers is less than 10 ps. Consequently, for optical signals with faster responses, optical gating techniques are required. In the frequency domain, applications for high-speed photoreceivers include laser heterodyning experiments and millimeter-wave signal generation. The maximum frequency bandwidths for such detectors can exceed 50 GHz in well-designed devices.

Based on the discussion above, diffusion of carriers to the depletion region is a relatively slow process in reverse biased p-n junctions that could serve to limit the response time of a photoreceiver. To minimize this effect, a p-i-n photodiode is typically utilized where an un-doped intrinsic layer is sandwiched between the p and n layers in a p-n junction (see above figure). This structure effectively widens the depletion layer. This results in a greater proportion of the generated current being carried by the faster drift process instead of diffusion. The increased depletion width also allows for a reduction in the RC time constant(via a decreased junction capacitance) and increased area for capturing light. The p-i-n device structure is ubiquitous in high-speed photoreceivers and enables fast rise times and large bandwidths. However, the final measured optical signal will be as slow as the slowest component of a detection system even if a sufficiently fast photoreceiver is employed. Therefore, care should be taken when choosing connectors, cables, an oscilloscope, and a spectrum analyzer to measure a fast optical signal.

Silicon or InGaAs Versions

The silicon photodetector version has a 0.9 mm diameter PIN detector that provides wavelength coverage from 300-1050 nm.  The InGaAs photodetector version has a 0.3 mm diameter PIN detector that provides wavelength coverage from 900-1700 nm.

Adjustable high-pass and low-pass filters

Independent control of the low and high-frequency corners allows you to reject unwanted noise effectively. The single-pole filters provide a slope of –6 dB/octave with less than 90° phase shift. The DC÷30 setting prevents your signal from going off-scale due to DC amplitude fluctuations, without attenuating fast signals. The high-pass filter can be adjusted to eliminate residual 60-Hz noise, and the independent low-pass filter can be set to dampen noisy signals. The upper left knob adjusts the low-frequency corner and the upper right knob adjusts the high-frequency corner. The corner frequency increases by a factor of three with each full clockwise turn. The photoreceivers have ten settings for each frequency corner, creating a wide variety of frequency responses.

Tiny Jack for Height Adjustment

Our Model 9201 Tiny jack is especially useful for aligning the height of this free space optical receiver to the optical beam.

Variable-gain Transimpedance Amplifier

Variable gain of up to 90 dB in 10-dB steps gives you a useful input range from 1 pW to 10 mW. For small signals requiring 80-dB or greater gain, the maximum bandwidth is reduced from 200 kHz to 20 kHz.

Flexibility & High Performance for a Wide Range of Applications

These photoreceivers can be used for many different applications, including aligning fibers in high-speed-photodetector test and pigtailing setups. They can also be employed as low-noise, DC-coupled photoreceivers/preamplifiers in servo-control systems requiring near-zero phase shifts at up to 100 kHz. Or they can be used in lock-in amplifier systems to take advantage of their shot-noise-limited performance and 90-dB maximum gain. And by correlating their output voltages to a calibrated power meter, these photoreceivers can also serve as sensitive power sensors.

Model 2001-FC photoreceiver used in conjunction with Model 9131 fiber aligner to optimize the coupling efficiency of incoming laser light into an optical fiber.