Highly precise stabilization of intracavity prism-based Er:fiber frequency comb using optical-microwave phase detector

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 3.6×10(-13) for each comb mode. The demonstrated stabilization scheme could provide a high-precision comb for optical communication, direct frequency comb spectroscopy.

Recent Advances, Applications, and Perspectives in Erbium-Doped Fiber Combs

“…In addition, the noise measurement and control of the comb system are also quite important [54,55]. locking principles of erbium-doped fiber lasers mainly include real SA mode-locking [43,44], NPR mode-locking [28,34], NALM mode-locking [29,30], and hybrid mode-locking [45][46][47][48]. In addition, the real SA mainly includes semiconductor-saturable absorber mirrors (SESAMs) and carbon nanotubes (CNs).…”

“…According to the classification based on the gain medium, mode-locked fiber lasers can be categorized into Er-doped mode-locked fiber lasers [27][28][29][30][31][32][33], Yb-doped mode-locked fiber lasers [34][35][36][37][38], Tm-doped mode-locked fiber lasers [39][40][41][42], and so on. Among them, Er-doped mode-locked fiber lasers have gained considerable attention from researchers for several reasons.…”

“…These include operation in the 1.5 µm communication wavelength band, mature device fabrication processes, compact structure, and low cost. The locking principles of erbium-doped fiber lasers mainly include real SA mode-locking [43,44], NPR Photonics 2024, 11,192 2 of 15 mode-locking [28,34], NALM mode-locking [29,30], and hybrid mode-locking [45][46][47][48]. In addition, the real SA mainly includes semiconductor-saturable absorber mirrors (SESAMs) and carbon nanotubes (CNs).…”