Polarization-Dependent Balanced Detector


Polarization Dependent Balanced Detector

  • Polarization Dependent Balanced Detection
  • Ultra Low Noise
  • Excellent Common Mode Rejection


  • Compact Design
  • Integrated Signal Detection with Active Aliasing Filter
  • Fast Monitor Outputs for External Polarization Adjustment
  • Excellent Common Mode Rejection
  • Matched Lengths of S and P Paths

The INT-POL-1300 is an integrated pair of balanced detectors that are used to analyze the S and P States of Polarization (SOP) of two input signals independently. This compact system is designed for polarization sensitive optical coherence tomographyy (OCT) applications, but it can be used in any application where the difference between two signals has to be analyzed with high sensitivity.

Functionality of Balanced Receivers

The S and P polarization states of the input are split using a polarization beamsplitters (PBS). The split inputs are directed into two balanced detectors, one for each SOP. These balanced photodetectors operate in the same manner as our PDB400 Series of OCT Balanced Detectors, they subtract the two optical input signals from each other resulting in the cancellation of common mode noise. This allows small changes on the signal path to be extracted from the interfering noise floor for each SOP.

Noise Reduction

These receivers are comprised of two balanced photodetectors and an ultra-low-noise, high-speed transimpedance amplifier. The advanced design allows an improved matching of the two balanced photodetectors to achieve an excellent common mode rejection, leading to better noise reduction. Futhermore the balanced detectors have active low-pass filters to prevent aliasing effects and to suppress out of band noise effectively.


Optical signals are coupled to the photodiodes via two FC/APC input connectors. The unit has 6 electrical SMA output connectors 3 per polarization state, i.e. 3 for the S and 3 for the P polarisation state. One of these 3 outputs provides the balanced signal and the other two are the power monitor outputs. The monitor outputs enable the control of the input power levels for each detector separately and can be used to adjust the input SOPs for each channel independently. The device is powered via an ±12 V DC input connector.

Packaging and Power Supply

The unit is housed in a rugged, shielded aluminum enclosure. The unit is powered from a ±12 Volts DC power supply which is included.


Item #INT-POL-1300
Optical Parameters
Wavelength Range* 1270 - 1350 nm
Fiber Type Corning SMF28
Optical Connectors FC/APC
Extinction Ratio (PBS) 22 dB
Max. Input Power 1300 nm 20 mW
Electrical Parameter
Detector Material/Type InGaAs / PIN
Detector Wavelength Range 800 - 1700 nm
Typical Max. Responsivity 1.0 A/W
Output Bandwidth RF Output DC - 15 MHz
Output Bandwidth Monitor Output DC - 5 MHz
Transimpedance Gain 50 x 10³ V/A
Conversion Gain Monitor Outputs 5 V/mW
Saturation Power 80 µW @ 1300 nm
Electrical Output /Impedance SMA, 50 Ω
DC Offset ±10 mV
Power Supply ±12 V, 200 mA
All accuracy data is valid at 23 ± 5 °C and 45% Humidity

*The limitation of the operating wavelength range of the INT-POL-1300 module is determined by the bandwidth of the two polarization beamsplitters used. The central wavelength of these beamsplitters is 1310nm, with a +/-40 nm operating bandwidth.


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