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Tunable broadband light coupler based on two parallel all-fiber acousto-optic tunable filters
Wending Zhang1, Ligang Huang, Feng Gao
1MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics School and School of Physics, Nankai University, Tianjin 300457, China.
Optics Express
|August 14, 2013
Summary
Researchers developed a tunable broadband light coupler using evanescent-field coupling in all-fiber acousto-optic tunable filters. This device offers a wide tuning range and uniform insertion loss for optical communication systems.
Area of Science:
- Photonics
- Optical Engineering
- Fiber Optics
Background:
- Acousto-optic tunable filters (AOTFs) are crucial components in optical signal processing.
- Achieving tunable broadband light coupling with uniform insertion loss remains a challenge.
Purpose of the Study:
- To demonstrate a novel tunable broadband light coupler based on evanescent-field coupling.
- To achieve a wide spectral tuning range with uniform insertion loss.
Main Methods:
- Utilized evanescent-field coupling between cladding modes of adjacent all-fiber acousto-optic tunable filters.
- Experimental demonstration of spectral tuning and insertion loss measurements.
Main Results:
- Achieved a wide spectral tuning range from 1490 nm to 1610 nm, covering C-, L-, and parts of S-bands.
- Demonstrated a wavelength tunability slope of -0.72 nm/kHz.
- Observed uniform insertion loss of approximately -5.0 dB across the tuning range.
Conclusions:
- The developed evanescent-field coupling structure enables tunable broadband light coupling.
- The device shows potential for broadband optical fiber add/drop multiplexers and tunable broadband light couplers.
- Applications include coarse wavelength division multiplexing (CWDM) systems.
