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Ultralow- Light-Level Photoreceivers

Ultralow- Light-Level Photoreceivers
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Ultralow- Light-Level Photoreceivers - 1

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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Ultralow- Light-Level Photoreceivers - 3

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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