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Optically controlled microwave phase shifter based on nonlinear polarization rotation in a highly nonlinear fiber
Optics Letters
|May 31, 2014
Summary
This study presents an optically controlled microwave phase shifter utilizing nonlinear polarization rotation in highly nonlinear fiber. It achieves a full 360° phase shift across an ultra-wideband frequency range, tunable by control light power.
Area of Science:
- Photonics
- Microwave Engineering
- Nonlinear Optics
Background:
- Microwave phase shifters are crucial components in various communication systems.
- Controlling microwave signals optically offers advantages in bandwidth and isolation.
Purpose of the Study:
- To develop an optically controlled microwave phase shifter with ultra-wideband operation.
- To achieve a full 360° phase shifting range using nonlinear polarization rotation.
Main Methods:
- Utilizing nonlinear polarization rotation (NPR) in a highly nonlinear fiber (HNLF).
- Employing a polarization modulator (PolM) driven by a microwave signal.
- Implementing single-sideband modulation and filtering to isolate the signal.
Main Results:
- Demonstrated an optically controlled microwave phase shifter.
- Achieved a full 360° tunable phase shift.
- Verified ultra-wideband operation from 8 to 38 GHz.
Conclusions:
- The proposed method enables precise optical control of microwave phase shifts.
- Nonlinear polarization rotation in HNLF is effective for ultra-wideband phase shifting.
- The device offers a wide tuning range for microwave signal processing.
