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Writing Bragg Gratings in Multicore Fibers
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Photonic scanning receiver using an electrically tuned fiber Bragg grating.
1Department of Fiber Photonics, Acreo AB, Electrum 229, 164 40 Stockholm, Sweden.
Optics Letters
|December 18, 2009
Summary
This study demonstrates an electrically tuned fiber Bragg grating for filtering microwave signals. The device achieves high optical carrier rejection, enabling fast radio frequency analysis.
Area of Science:
- Photonics
- Optical Engineering
- Microwave Engineering
Background:
- Fiber Bragg gratings (FBGs) are crucial optical components.
- Microwave signal processing often requires precise filtering.
- Electrical tuning offers dynamic control over optical filters.
Purpose of the Study:
- To develop an electrically tunable fiber Bragg grating for microwave signal filtering.
- To evaluate the performance of a chirped distributed-feedback FBG for this application.
- To demonstrate its utility in radio frequency (RF) analysis.
Main Methods:
- Utilized a 5-cm-long electrically tuned fiber Bragg grating.
- Employed a chirped distributed-feedback structure.
- Tested filtering of a microwave signal on a 1.55 µm optical carrier.
Main Results:
- Achieved a transmission bandwidth of 54 MHz.
- Demonstrated relative optical carrier rejection greater than 30 dB for RF frequencies above 2 GHz.
- Showcased rapid, monotonic sweeps of Bragg wavelength for fast frequency sweeps.
Conclusions:
- Electrically tuned FBGs are effective for microwave signal filtering.
- The chirped DFB structure provides significant carrier rejection.
- This technology enables high-speed RF analysis through wavelength sweeping.
