Coherence control of spectrally multiplied frequency combs using an integrated multi-mode DBR laser

S. Abdollahi; P. Marin-Palomo; M. Virte

doi:10.1117/12.3022306

20 June 2024 Coherence control of spectrally multiplied frequency combs using an integrated multi-mode DBR laser

S. Abdollahi, P. Marin-Palomo, M. Virte

Proceedings Volume 13004, Nonlinear Optics and its Applications 2024; 130040N (2024) https://doi.org/10.1117/12.3022306
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

Optical frequency combs (OFCs) have been identified as a key building block for many applications ranging from spectroscopy to optical communications. In these applications, the fixed phase relation between the individual spectral components of the comb is a crucial aspect of frequency combs. Recently multi-wavelength lasers that are in essence multimode lasers have shown a promising capability to enable frequency comb multiplication over a broad range of frequency offsets surpassing 1 THz. Despite the robust phase coherence within each comb's lines, there remains a notable lack of phase coherence among distinct sub-combs. In this work, we show that the injecting of an adapted frequency comb, i.e., a narrowband comb comprising five lines and an extra tone separated by a certain frequency offset from the central line of the comb, facilitates cascaded phase locking between three adjacent sub-combs. The interaction between the regenerated comb and the multiplied comb induced by the extra tone initiates a modulation at their beating frequency. By fine-tuning the frequency of the extra tone, we can adjust the position of the resulting beating, and eventually achieve a cascaded phase locking for the third mode. We envision that cascaded phase-locking can advantageously be extended to additional modes leading to cover higher frequency offsets up to a few THz.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

S. Abdollahi, P. Marin-Palomo, and M. Virte "Coherence control of spectrally multiplied frequency combs using an integrated multi-mode DBR laser", Proc. SPIE 13004, Nonlinear Optics and its Applications 2024, 130040N (20 June 2024); https://doi.org/10.1117/12.3022306

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