Detailed Description; General Principle Of Operation - THORLABS INT-COM-1300 Operation Manual

3 Detailed Description

3.1 General Principle of Operation

The Thorlabs INT-COM-1300 Common Path OCT Interferometer is a subassembly to
be used in swept source Fourier domain OCT systems and other applications. It
contains a fusion coupler / circulator network to operate with an external Common
Path interferometer probe. The integrated balanced detector similar to Thorlabs
PDB145C is used for detection of the generated interference fringes. The used fusion
couplers are optimized for flat wavelength response and very low PDCR (polarization
dependent coupling ratio change) to make the signal nearly independent of input
polarization changes. An additional aiming laser input simplifies the optical alignment
of the probe.
The INT-COM-1300 is powered by the included external power supply (±12V,
200mA) via a PICO M8 power connector.
Figure 1 shows a functional block diagram of the INT-COM-1300 Common Path OCT
Interferometer.
PROBE PROBE
VOA IN VOA IN
VOA OUT VOA OUT
Figure 1: Functional block diagram of the INT-COM-1300
WDM WDM
Circulator Circulator
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Slope Compensation Slope Compensation
3 Detailed Description
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95/5 95/5
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INT-COM-1300 / page 5
660 nm IN 660 nm IN
1300 nm IN 1300 nm IN
OUTPUT OUTPUT
DC INPUT DC INPUT