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Digital multi-channel stabilization of four-mode phase-sensitive parametric multicasting.

Lan Liu, Zhi Tong, Andreas O J Wiberg

|August 5, 2014

Summary

A new digital phase-locked loop (DPLL) stabilizes the four-mode phase-sensitive (4MPS) process for enhanced parametric multicasting. This method improves conversion efficiency (CE) and signal-to-noise ratio (SNR) for broadband signals.

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Area of Science:

Optical Engineering
Photonics
Nonlinear Optics

Background:

Phase-sensitive (PS) devices, often acting as interferometers, are susceptible to environmental fluctuations, leading to instability.
Instability in multi-beam PS devices hinders efficient parametric multicasting, impacting conversion efficiency (CE) and signal-to-noise ratio (SNR).
Existing methods struggle to maintain stable operation in phase-sensitive parametric processes under ambient conditions.

Purpose of the Study:

To investigate a stable four-mode phase-sensitive (4MPS) process for enhancing parametric multicasting.
To develop and demonstrate a novel stabilization technique for PS devices used in multicasting.
To improve the conversion efficiency (CE) and signal-to-noise ratio (SNR) of multi-pump driven parametric multicasting.

Main Methods:

Theoretical and experimental investigation of a phase-sensitive (PS) device prone to ambient-induced fluctuations.
Development of a novel stabilization technique utilizing a digital phase-locked loop (DPLL).
The DPLL controls the phases of three input waves (pumps and signal) in the 4MPS multicaster to maximize CE and SNR.

Main Results:

A new continuous-operation DPLL was developed to stabilize the 4MPS process, ensuring operation independent of environmental fluctuations.
The technique successfully optimized the PS-induced improvement of CE and SNR by controlling input signal phase.
Demonstrated over 10 dB CE improvement for more than 20 signal copies in a stabilized PS parametric broadband multicasting system.

Conclusions:

The developed DPLL-based stabilization technique enables robust and stable PS parametric broadband multicasting.
This approach significantly enhances CE and SNR, overcoming limitations caused by environmental instabilities.
The findings pave the way for practical applications requiring high-efficiency, stable optical signal multicasting.