Ultralow- Light-Level Photoreceivers

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Ultralow- Light-Level Photoreceivers

Product catalog summary

Model 1647 1-GHz Avalanche Photodiode (APD) Photoreceivers

Specifications: The Model 1647 features a wavelength range of 800–1650 nm, a 3-dB bandwidth of 15 kHz–1.1 GHz, and a rise time of 250 ps. It offers a peak conversion gain of 28,000 V/W for differential outputs and 14,000 V/W for single output, with an output impedance of 50 Ω. The noise-equivalent power (NEP) is typically 1.6 pW/√Hz, and it has a saturation power of 6 µW and a CW optical damage threshold of 200 µW. Power requirements are ±15 V, <200 mA.
Features: These photoreceivers are designed for ultralow-light-level detection, incorporating a high-gain avalanche photodiode and a low-noise amplifier in a compact module. They include a built-in temperature-compensation circuit and adjustable gain to optimize signal-to-noise ratio. The device supports both single-ended and differential outputs, with an RF-shielded package and necessary power and monitor cables.
Applications: Suitable for setups requiring minimized noise, such as transmission line setups. The device is optimized for noise performance and sensitivity, allowing measurements of nW modulation on large CW signals.
Pricing: The Model 1647 is priced at $2,250, with a 3-year extended warranty available for $695. International prices add 10%.

Models 2151 and 2153 Femtowatt Photoreceivers

Specifications: The Model 2151 covers a wavelength range of 320–1050 nm, while the Model 2153 covers 800–1700 nm. Both models have a 3-dB bandwidth of DC–750 Hz (DC setting) and 30–750 Hz (AC setting), with peak conversion gains of 1×10¹¹ V/W and 2×10¹¹ V/W, respectively. They feature a typical maximum responsivity of 0.5 A/W and 1.0 A/W, with a transimpedance gain of 2×10¹⁰ and 2×10¹¹ V/A. The minimum NEP is 16 fW/√Hz for Model 2151 and 23 fW/√Hz for Model 2153.
Features: These photoreceivers are ideal for ultra-low-light-level detection, offering high gain and low noise performance. They are powered by a single 9-V battery, eliminating the need for cooling or high-voltage power supplies. The devices include a three-position switch for selecting gain settings and AC or DC response, and they are equipped with a non-conductive pad to reduce noise pickup.
Applications: Suitable for spectroscopy or fluorescence experiments, with the ability to achieve sensitivity levels in the femtowatt range when used with a chopper and lock-in amplifier.
Pricing: The Model 2151 is priced at $855, and the Model 2153 at $955, with a 3-year extended warranty available for $125. International prices add 10%.

Catalog excerpts

բȚ Hz(typical) with high conversion gain. The APD gain is adjustable so that you can optimize your signal-to-noise ratio for your particular optical power. For your convenience, these APD photo-receivers have a built-in temperature-compen- sation bias circuit so you dont need to worry about small temperature changes compromising your measurements. And, the DC current in the APD is limited so as to reduce damageto the amplifier and APD due to excessive currents.These APDphotoreceivers include bothsingle-ended and differential outputs. When only one SMA output is used (single-ended), the photoreceiver operates like any of our other standard high-speed photoreceivers.When both SMA outputs are used (differen-tial), each output is the opposite polarity of the other and can be used as a pair,e.g. ontransmission line setups to minimize noise.These APDphotoreceivers come in an RF-shielded package with their own powerand monitor cables. YouҒll only need a 15-V power supply such as our Model 0901 (see page 138). We are pleased to offer these APD photo-receivers for ultralow-light-level detection. These photoreceivers consist of a high-gain avalanche photodiode, followed by a low-noise amplifierand internal bias supply all in a compactmoduleїno need for separate high-voltage input. We optimize the noise performance of these APDs while enhancing the overallsensitivity of the APDphotoreceiverwith theinclusion of a linear amplifier. The amplifier is AC-coupled to allow measurements of nW of modulation on large CWsignals. The result is an APD and amplifier combination with a lownoise-equivalent-power as low as 1.6 pW/ > Model 1647

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battery-check LED gain settingoutput (BNC) > 1.16"(29.5) BattO Chk OFFONOutputAmpLEDAC HighAC LowDC Low Battery CheckOCircuit 1.00"(25.4) > 4.18"(106.2) 2.50"(63.5)1.25"(31.75) photodetector power switch 8-32 (M4)mounting threads >

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