125 MHz Optical Receivers

Our 125 MHz optical receivers offer a well-balanced combination of gain, bandwidth, and low noise over the DC–125-MHz frequency range. 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 3 ns. This high sensitivity, combined with their high-level output, reduces the effects of downstream noise sources. 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 free space optical front ends for systems requiring a low-noise input.

High transimpedance gain and low noise
Silicon or InGaAs versions
AC & DC coupled versions
Excellent RF shielding

See All Features

Description	Compatibility	Wavelength Range	3 dB Bandwidth	Maximum Conversion Gain	Peak Responsivity	Avail.	Price
1801-FSFree Space Optical Receiver, 320-1000 nm Silicon, 125 MHz, DC-Coupled	UNIVERSAL	320-1000 nm	DC to 125 MHz	2x10⁴ V/W	0.5 A/W @ 800 nm	In Stock FREE 2-day shipping on thousands of products on Newport.com Learn More	$1,690
1801-FS-ACFree Space Optical Receiver, 320-1000 nm Silicon, 25 kHz - 125 MHz, AC-Coupled	UNIVERSAL	320-1000 nm	25 kHz to 125 Mhz	2x10⁴ V/W	0.5 A/W @ 800 nm	Contact Us	$1,830
1811-FSFree Space Optical Receiver, 900-1700 nm InGaAs, 125 MHz, DC-Coupled	UNIVERSAL	900-1700 nm	DC to 125 MHz	4x10⁴ V/W	1.0 A/W @ 1550 nm	Contact Us	$1,690
1811-FS-ACFree Space Optical Receiver, 900-1700 nm InGaAs, 25 kHz - 125 MHz, AC-Coupled	UNIVERSAL	900-1700 nm	25 kHz to 125 Mhz	4x10⁴ V/W	1.0 A/W @ 1550 nm	In Stock	$1,840

Specifications

Detector Diameter
1801: 0.4 mm
1811: 0.3 mm
Detector Material
1801: Silicon
1811: InGaAs
Detector Type
PIN
Maximum Transimpedance Gain
4x10⁴ V/A
Rise Time
3 ns
Saturation Power
1801: 110 µW @ 800 nm
1811: 55 µW @ 1550 nm

DC Bias Monitor Bandwidth
50 KHz (for -AC models only)
DC Bias Monitor Transimpedance Gain
10 V/mA (for -AC models only)
Output Connector
SMA
Output Impedance
50 Ω
Power Requirements
±15 VDC, 200 mA
Thread Type
8-32 (includes M4 adapter)

Features

Silicon or InGaAs Versions

Silicon models provide visible wavelength coverage from 320-1000 nm and use a silicon-PIN photodiode with a high-gain, low-noise transimpedance amplifier. The near-IR version uses an InGaAs-PIN photodetector that provides coverage from 900-1700 nm. These receivers will enable 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.

Typical Responsivity of Model 1801 (Silicon)

Typical Responsivity of Model 1811 (InGaAs)

High Transimpedance Gain and Low Noise

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 3 ns. This high sensitivity, combined with their high-level output, reduces the effects of downstream noise sources.

DC Coupled Versions

With true DC coupling, these photoreceivers give linear responses to transient signals without artificial ringing, tails, or other anomalies. For applications where you need to measure both the AC modulation and the DC component, choose the DC coupled receiver.

AC Coupled Versions

AC-coupled versions with a low-frequency roll-off at 25 kHz are available. These photoreceivers are useful for measuring AC signal with a higher resolution, even when you have a large DC component, than the DC version. To make alignment easier, AC-coupled versions are equipped with an additional DC photocurrent monitor output. The monitor output has a 50-kHz bandwidth and a gain of 1 V/mA.

RF Shielding

Careful RF shielding and filtering of power-supply inputs eliminate electromagnetic interference, even in laboratories with Q-switched lasers and other noisy equipment.

Typical Frequency Response

Typical Output Noise

Accessories

Included Accessories

	Compare	Description	Compatibility	Drawings, CAD & Specs	Avail.	Price
		0923Accessory Cable, Pico (m8) Double-Ended, Male to Male, 1 m	UNIVERSAL		In Stock	$59
		0924Accessory Cable, Pico (m8) Male to Banana Plug, 1 m	UNIVERSAL		In Stock FREE 2-day shipping on thousands of products on Newport.com Learn More	$103

125 MHz Optical Receivers

125 MHz Optical Receivers

Specifications

Features

Silicon or InGaAs Versions

Typical Responsivity of Model 1801 (Silicon)

Typical Responsivity of Model 1811 (InGaAs)

High Transimpedance Gain and Low Noise

DC Coupled Versions

AC Coupled Versions

RF Shielding

Typical Frequency Response

Typical Output Noise

Accessories

Included Accessories

Resources

Literature

Technical Notes

Selection Guides

Manuals

Other

Related Products

Photodetector and Photoreceiver Power Supply

125 MHz Fiber-Optic Receivers

200 kHz Optical Receivers

10 MHz Adjustable Optical Receivers