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Linearization of phase-modulated analog optical links using a four-wave mixing comb source
Optics Express
|January 22, 2015
Summary
This study introduces a new method to eliminate distortion in analog optical links. The technique uses four-wave mixing to cancel signal distortion, significantly improving performance.
Area of Science:
- Photonics and Optical Engineering
- Signal Processing
- Nonlinear Optics
Background:
- Phase-modulated analog optical links are susceptible to distortion.
- Interferometric phase-to-amplitude conversion introduces unwanted signal distortion.
- Third-order distortion limits the performance of optical links.
Purpose of the Study:
- To present a novel method for distortion elimination in phase-modulated analog optical links.
- To demonstrate the cancellation of third-order distortion.
- To improve the spurious-free dynamic range (SFDR) of optical links.
Main Methods:
- Utilizing a small portion of the phase-modulated signal to seed a four-wave mixing (FWM) comb source.
- Generating lightwaves with integer multiples of the original signal's phase modulation via FWM.
- Scaling and re-combining generated lightwaves with the original signal to cancel distortion.
Main Results:
- Demonstrated full cancellation of third-order distortion.
- Achieved a 19-dB improvement in the link's spurious-free dynamic range (SFDR) at a 1-Hz bandwidth.
- Validated the effectiveness of the FWM-based distortion cancellation technique.
Conclusions:
- The presented method effectively eliminates distortion in phase-modulated analog optical links.
- The approach is extendable to higher-order distortion products and arbitrary transfer functions.
- This technique offers a significant advancement in optical link performance and flexibility.
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