Phase-predictable tuning of single-frequency optical synthesizers

TL;DR

This paper presents a method for phase-predictable, cycle slip-free tuning of single-frequency optical synthesizers over a wide frequency range, without the need for comb line switching, demonstrating high phase stability.

Contribution

It introduces a novel tuning approach that ensures phase stability and eliminates the need for comb line order switching in optical synthesizers.

Findings

Achieved 28.1 GHz tuning range with stable phase

Zero-to-peak phase deviation of 62 mrad

No comb line switching needed over multiple ranges

Abstract

We investigate the tuning behavior of a novel type of single-frequency optical synthesizers by phase comparison of the output signals of two identical devices. We achieve phase-stable and cycle slip free frequency tuning over 28.1 GHz with a maximum zero-to-peak phase deviation of 62 mrad. In contrast to previous implementations of single-frequency optical synthesizers, no comb line order switching is needed when tuned over more than one comb line spacing range of the employed frequency comb.