Common Path


OCT Common-Path Interferometer

  • Common Path Interferometer
  • Balanced Detection
  • Low Insertion Loss


  • Low Insertion Loss
  • Flat Wavelength Response
  • Integrated Balanced Signal Detection with Active Aliasing Filter
  • Input for 660 nm Alignment Beam
  • Compact Design; Comes Complete with Power Supply

Thorlabs’ INT-COM-1300 interferometer is designed to be used inside a swept source OCT system for common-path OCT applications. It integrates a fiber coupler network for use with an external common-path interferometer probe. These couplers are optimized for flat wavelength response and very low polarization dependant coupling losses. The integrated high-gain balanced detector includes an active aliasing filter that minimizes the generation of aliasing frequencies in the digitized fringe signals for improved image quality.

The module is designed for ease of use, and easy integration using the FC/APC angled fiber adapters. Alignment is made easier due to an additional input for a 660 nm aiming laser and a specially designed WDM coupler that combines the swept laser source (1300 nm) and the alignment laser (660 nm).


Item #INT-COM-1300
Wavelength Range 1250 - 1350 nm
Insertion Loss: 1300 nm IN to Probe* <1.5 dB (Typ), 2.3 dB (Max)
Insertion Loss: 1300n m IN to VOA IN*  
Insertion Loss: 660 nm IN to Probe Port*  
Output Bandwidth (3 dB) DC - 15 MHz
Saturation Power** 70 uW @ 1300 nm
Maximum Input Power
(Damage Threshold)**
20 mW

*Includes connector losses measured at the central wavelength
**Coupled into Probe a or VOA Output port


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