Abstract

In this Letter, we demonstrate a fully stabilized Er:fiber frequency comb by using a fiber-based, high-precision optical-microwave phase detector. To achieve high-precision and long-term phase locking of the repetition rate to a microwave reference, frequency control techniques (tuning pump power and cavity length) are combined together as its feedback. Since the pump power has been used for stabilization of the repetition rate, we introduce a pair of intracavity prisms as a regulator for carrier-envelope offset frequency, thereby phase locking one mode of the comb to the rubidium saturated absorption transition line. The stabilized comb performs the same high stability as the reference for the repetition rate and provides a residual frequency instability of $3.6\times {10}^{-13}$ for each comb mode. The demonstrated stabilization scheme could provide a high-precision comb for optical communication, direct frequency comb spectroscopy.

© 2014 Optical Society of America

Stabilization of a self-referenced, prism-based, Cr:forsterite laser frequency comb using an intracavity prism

Karl A. Tillman, Rajesh Thapa, Kevin Knabe, Shun Wu, Jinkang Lim, Brian R. Washburn, and Kristan L. Corwin
Appl. Opt. 48(36) 6980-6989 (2009)

Frequency comb-based microwave transfer over fiber with 7×10⁻¹⁹ instability using fiber-loop optical-microwave phase detectors

Kwangyun Jung, Junho Shin, Jinho Kang, Stephan Hunziker, Chang-Ki Min, and Jungwon Kim
Opt. Lett. 39(6) 1577-1580 (2014)

Toward an all-optically stabilized frequency comb based on a mode-locked fiber laser

Tim Hellwig, Steffen Rieger, and Carsten Fallnich
Opt. Lett. 39(3) 525-527 (2014)

Precision spectroscopy using a partially stabilized frequency comb

M. Lyon and S. D. Bergeson
Appl. Opt. 53(23) 5163-5168 (2014)

Distribution of optical-comb-based multi-frequency microwave signals over 100 km optical fiber with high phase stability

Nan Deng, Wei Wei, Zhangweiyi Liu, Weilin Xie, and Yi Dong
Opt. Express 28(11) 16634-16643 (2020)