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Description

The High Quantum Efficiency Low Noise Balanced Detector from Noisy Labs is a precision photodetection module designed for ultra-low-noise optical measurements at 1550 nm. Optimized for applications where signal fidelity is critical, the detector combines high-quantum-efficiency photodiodes, excellent common-mode rejection, and low electronic noise to enable shot-noise-limited measurements in demanding photonics experiments.

Available in configurations for 1550 nm, the detector achieves quantum efficiency exceeding 95% while providing common-mode rejection ratios greater than 50 dB and up to 20 dB dark noise clearance. The balanced detection architecture effectively suppresses common-mode intensity noise from the local oscillator, allowing weak optical signals to be measured with exceptional sensitivity.

Designed for research laboratories, quantum technology, coherent communications, and precision interferometric measurements, the detector features a compact form factor, RF demodulation input with customizable modulation frequency, and stable operation across a wide range of optical input powers. Its robust performance makes it an excellent solution for homodyne detection, heterodyne detection, squeezed-light experiments, optical metrology, and other low-noise photonic applications.

High Quantum Efficiency Low Noise Balanced Detector for 1550 nm

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Specifications

Max Total Input Power: 20 mW
3dB Bandwidth: 70 MHz
Output Impedance: 50 Ohm
Dark Noise Clearance (min): 15 dB
DC Output Voltage: -5 – 5 V
RF Input Frequency: 0.15 – 100 MHz
RF Input Power (max): 12 dBm
Central Wavelength: 1550 nm
Quantum Efficiency: >95%
Active Area Size: 0,1 mm diameter
Angle Of Incidence: 10 deg
AC High Pass Cutoff: 300 kHz (adjustable upon request)

Got questions about specs? Use the inquiry form to ask.

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Features

  • High quantum efficiency exceeding 95% at 1550 nm
  • Balanced detector architecture for low-noise optical signal detection
  • Common-mode rejection ratio greater than 50 dB at 1 MHz to suppress correlated laser intensity noise
  • Dark noise clearance up to 20 dB below vacuum noise for high-sensitivity measurements
  • Linear shot-noise scaling with increasing local oscillator power
  • Available with 100 Ξm photodiodes at 1550 nm and 3dB bandwidth of 70 MHz for straightforward integration with measurement electronics
  • Compact benchtop package with Âą12 V power supply
  • Suitable for laboratory, OEM, and quantum photonics applications

Applications

  • Balanced homodyne and heterodyne detection
  • Quantum optics and squeezed-light experiments
  • Continuous-variable quantum key distribution (CV-QKD), Coherent optical communication receivers
  • Laser intensity noise characterization
  • Optical interferometry and precision metrology
  • Optical coherence and phase-sensitive measurements
  • Photonics research laboratories
  • Scientific instrumentation and OEM optical systems

Frequently Asked Questions

What is a balanced photodetector?
A balanced photodetector uses two closely matched photodiodes whose photocurrents are electronically subtracted. This configuration suppresses common-mode laser intensity noise while amplifying the differential optical signal, allowing extremely weak optical signals to be measured with much higher sensitivity than a conventional photodiode.
What wavelengths are supported by this detector?
The detector is available at 1550 nm with a quantum efficiency greater than 95%, making them well suited fiber lasers, and telecom-band optical experiments.
Why is common-mode rejection ratio important?
Common-mode rejection ratio (CMRR) indicates how effectively the detector suppresses noise that is present on both optical inputs, such as laser intensity fluctuations. A high CMRR improves measurement accuracy by allowing the detector to isolate the desired signal from unwanted technical noise.
Which applications benefit most from balanced detection?
Balanced detectors are widely used in coherent optical communications, quantum optics, homodyne and heterodyne detection, laser stabilization, optical metrology, interferometry, and other experiments where low-noise, high-sensitivity optical measurements are required.
Can this detector be integrated into OEM or laboratory systems?
Yes. The detector provides a compact housing, and stable electrical characteristics, making it suitable for integration into laboratory instruments, research platforms, and OEM photonic systems requiring high-performance balanced optical detection.

Got more questions? Use the inquiry form to ask the supplier directly.

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