Computer Controlled Variable Ratio Coupler
Computer-controlled variable-ratio coupler (CTDC) has an all-fiber construction and provides the tuning range of 0 – 100 % coupling ratio with negligible optical loss. A servo motor actuator facilitates fine-tuning coupling ratio through a motion controller. The computer-controlled version allows user-customized operation during the experiments.
It is based on evanescent field coupling using two side polished fibers where the coupling ratio is tuned by adjusting the core-to-core geometric offset. Customer specified fibers and operating wavelengths are available including single-mode fibers, polarization maintaining fibers and other specialty fibers.
Features
- Negligible loss
- Polished fiber coupler
- Tunable coupling ratio (0-100%)
- Available with various fiber types including SMF and PMF
- Controlled by the linear actuator
- Actuator & Driver included
- Compatible with 1⁄4’’-80 Threaded actuator ( 1⁄4’’-80 mounting bush)
- Available with body only option (without actuator)
- Very small size
Applications
- Quantum communication experiments
- Single-photon interference experiments
- Optical system testing
- Interferometry
- General laboratory experiments
- Optics education kits
Specifications
- Insertion loss(dB) : <0.1 (bare type), <0.5(adapter type)
- Tuning range of coupling (%) : 0-100
- Operation wavelength (nm) : 633, 890, 980, 1064, 1550
- Polarization Extinction Ratio(dB) : >20 (PM only)
- Adaptable linear actuator : 1/4" -80 thread, 6mm travel length
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