Symmetrical (Balanced) Photoreceivers / Photodetectors HBPR

Models for the spectral range from 320 to 1000 nm:

Model	HBPR-100M-60K-SI-FST HBPR-100M-60K-SI-FC	HBPR-200M-30K-SI-FST HBPR-200M-30K-SI-FC	HBPR-500M-10K-SI-FST HBPR-500M-10K-SI-FC
Si-PIN photo diode	0.8 mm Ø	0.8 mm Ø	0.4 mm Ø, FC model with ball lens
Spectral Range	320 - 1000 nm	320 - 1000 nm	320 - 1000 nm
Bandwidth (−3 dB)	DC - 100 MHz	DC - 200 MHz	DC - 500 MHz
Transimpedance Gain (switchable)	2.0 x 104 V/A 6.0 x 104 V/A	1.0 x 104 V/A 3.0 x 104 V/A	5.0 x 103 V/A 10.0 x 103 V/A
Conversion Gain (switchable)	10.8 x 103 V/W typ. 32.4 x 103 V/W typ. (@ 850 nm)	54 x 103 V/W typ. 16.2 x 103 V/W typ. (@ 850 nm)	2.55 x 103 V/W typ. 5.1 x 103 V/W typ. (@ 760 nm)
Minimum NEP	≤ 6.5 pW/√Hz (@850 nm)	≤ 7.8 pW/√Hz (@850 nm)	≤ 12 pW/√Hz (@760 nm)
NEP (@ 20 MHz)	≤ 7.4 pW/√Hz (@850 nm)	≤ 8.8 pW/√Hz (@850 nm)	≤ 13 pW/√Hz (@760 nm)
Common mode rejection (typ.)	50 dB	45 dB	40 dB
Data sheet FST Version
Data sheet FC Version

Models for the spectral range from 800 to 1700 nm:

Model	HBPR-100M-60K-IN-FST HBPR-100M-60K-IN-FC	HBPR-200M-30K-IN-FST HBPR-200M-30K-IN-FC	HBPR-450M-10K-IN-FST HBPR-500M-10K-IN-FC
InGaAs-PIN photo diode	0.3 mm Ø (FST model), 80 µm Ø, ball lens (FC model)
Spectral Range	800 - 1700 nm (FST model), 900 - 1700 nm (FC model)
Bandwidth (−3 dB)	DC - 100 MHz	DC - 200 MHz	DC - 450 MHz (FST) DC - 500 MHz (FC)
Transimpedance Gain (switchable)	2.0 x 104 V/A 6.0 x 104 V/A	1.0 x 104 V/A 3.0 x 104 V/A	5.0 x 103 V/A 1.0 x 104 V/A
Conversion gain @ 1550 nm (switchable)	19 x 103 V/W typ. 57 x 103 V/W typ.	9.5 x 103 V/W typ. 28.5 x 103 V/W typ.	4.75 x 103 V/W typ. 9.5 x 103 V/W typ.
Minimum NEP (@ 1550 nm)	≤ 3.7 pW/√Hz	≤ 4.4 pW/√Hz (FST) ≤ 4.1 pW/√Hz (FC)	≤ 6.5 pW/√Hz (FST) ≤ 6.7 pW/√Hz (FC)
NEP (@ 20 MHz, 1550 nm)	≤ 4.3 pW/√Hz (FST) ≤ 4.0 pW/√Hz (FC)	≤ 4.9 pW/√Hz (FST) ≤ 4.4 pW/√Hz (FC)	≤ 6.9 pW/√Hz
Common mode rejection (typ.)	50 dB (FST) 55 dB (FC)	45 dB (FST) 50 dB (FC)	35 dB (FST) 45 dB (FC)
Data sheet FST Version
Data sheet FC Version

The following specifications apply to all HBPR models:

Offset adjustable by potentiometer. Output short-circuit protected. Power supply via 3-pin Lemo® socket. A mating connector is provided with the device. Optional power supply PS-15 available. For further information please view the datasheet or contact FEMTO.

Detection of smallest optical difference signals from DC up to 500 MHz

By taking the exact difference between the two input signals, common-mode noise, such as the intensity noise of the laser source used, is suppressed. This way, smallest optical signals can be extracted from the signal measurement path that would otherwise be buried in the noise.

The photoreceivers / photodetectors of the HBPR series consist of a combination of two anti-parallel connected photodiodes with a subsequent low-noise transimpedance amplifier. The photodiodes are carefully selected and matched in pairs to achieve the highest possible common mode rejection ratio (CMRR). The low input noise (NEP) and excellent common mode rejection set standards for balanced photoreceivers in the MHz range and enable highly sensitive signal detection. The high bandwidth allows the precise detection of laser pulses, even with high repetition rates and rapidly changing signal shapes, such as in quantum state tomography.

Thanks to additional features such as switchable bandwidth limitation (low-pass filter), separate fast monitor outputs, adjustable offset and switchable AC/DC coupling, the photoreceivers of the HBPR series are among the most versatile balanced photoreceivers.

Compatible with optical bench (free space) and fibre optics

The free space inputs (FST) are designed as 1.035″-40 threaded flanges with screw-on coupler rings. It opens up a broad compatibility with optical accessories from various manufacturers, such as lenses, tubes, cage systems, optical adapters etc.

The relatively large-area detectors facilitate optical focusing in free space applications and ensure high and stable coupling efficiency when using the optionally available fibre optic adapters.

The free space SI models with Ø 0.8 mm photodetectors can easily be converted to a fibre connection (FC, FSMA) thanks to the large detector surface, by simply screwing on optionally available fibre adapters of the PRA series. For models with smaller detector areas, such as Ø 0.4 / 0.3 mm, the use of fibre adapters is only recommended to a limited extent, since coupling losses and instabilities can occur. If the focus is on high-precision fibre optic measurements, using HBPR FC-models with fixed optical fibre input will usually give the best results.

All HBPR photoreceivers are equipped with UNC 8-32 and M4 threaded holes and can therefore be conveniently and stably integrated into optical systems on standard holders.

Pic.1 Fibre-coupled version (FC)

(post-holder not included in scope of delivery)

Pic. 2 Free space version
with 1.035″-40 Thread (FST)

(post-holder not included in scope of delivery)

Applications

• Optical spectroscopy
• Coherent heterodyne detection
• Homodyne detection of optical quantum states
• Optical coherence tomography (OCT)
• Interferometric measurements
• Optical delay measurements
• Differential optical front end for oscilloscopes, spectrum analysers, A/D converters and lock-in amplifiers

Accessories

Power Supply

Fiber-Adapter

Spanner wrench