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Enhancing the Kramers-Kronig receiver via dispersion-based spatial diversity
Optics Letters
|July 8, 2020
Summary
This study presents a new method to reconstruct optical signals using two intensity measurements. The technique improves signal quality by reducing continuous-wave tone interference.
Area of Science:
- Optics and Photonics
- Signal Processing
- Information Theory
Background:
- Optical signal reconstruction is crucial for high-speed communication.
- Existing methods like Kramers-Kronig (KK) receivers have limitations in handling noise and signal quality.
- Decorrelated intensity measurements offer a potential alternative for signal recovery.
Purpose of the Study:
- To develop a novel scheme for reconstructing the complex envelope of optical signals.
- To improve signal quality by reducing continuous-wave (CW) tone interference.
- To achieve efficient signal reconstruction using an iterative algorithm.
Main Methods:
- Splitting the optical signal into two copies.
- Dispersing one signal copy before photo detection to achieve decorrelation.
- Employing an iterative algorithm, initialized with Kramers-Kronig (KK) reconstruction, for signal recovery.
Main Results:
- Successfully reconstructed the complex envelope of optical signals from decorrelated intensity measurements.
- The iterative algorithm required only a few tens of iterations for convergence.
- Achieved a 5 dB to 6 dB reduction in continuous-wave tone compared to KK receiver requirements.
Conclusions:
- The proposed scheme offers an effective method for optical signal reconstruction.
- The technique enhances signal quality by mitigating CW tone.
- This approach provides a more robust and efficient alternative for optical signal processing.
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