# Self-excited oscillation and synchronization of an on-fiber optomechanical cavity

## TL;DR

This paper investigates a novel on-fiber optomechanical cavity that exhibits self-excited oscillation and synchronization, with potential applications in sensing and signal control, revealing universal behaviors in phase transition dynamics.

## Contribution

It introduces a fully on-fiber optomechanical cavity with self-excited oscillation and synchronization capabilities, and analyzes its noise and phase-locking properties.

## Key findings

- Self-excited oscillation observed above a laser power threshold
- Synchronization achieved through periodic optical power modulation
- Universal behavior identified in phase transition between locked and free oscillation states

## Abstract

We study a fully on-fiber optomechanical cavity and characterize its performance as a sensor. The cavity is formed by patterning a suspended metallic mirror near the tip of an optical fiber and by introducing a static reflector inside the fiber. Optically induced self-excited oscillation (SEO) is observed above a threshold value of the injected laser power. The SEO phase can be synchronized by periodically modulating the optical power that is injected into the cavity. Noise properties of the system in the region of synchronization are investigated. Moreover, the spectrum is measured near different values of the modulation frequency, at which phase locking occurs. A universal behavior is revealed in the transition between the regions of phase locked and free running SEO.