Y. Rahimof, I.A. Nechepurenko, M.R. Mahani, A. Wicht

Published in:

Conf. on Lasers and Electro-Optics/Europe and European Quantum Electronics Conf. (CLEO/Europe-EQEC 2025), Munich, Germany, Jun. 23-27, ISBN: 979-8-3315-1252-1, ej-p-3 (2025).

Abstract:

Bragg gratings are essential components in many optical devices, including monolithic extended cavity diode lasers (mECDLs), which are designed to enhance the performance and efficiency of diode lasers [1]. This study focuses on developing accurate finite-difference time-domain (FDTD) simulations for large scale Bragg gratings by minimizing numerical errors through careful optimization of simulation parameters. A database of Bragg grating optical responses from these simulations can be used to create surrogate models. Using computationally inexpensive methods such as coupled mode theory (CMT), a 1D model, the reflectivity and shape of the reflectance spectrum can be calculated more quickly [2]. By fitting the CMT model to the simulated data, Bragg grating properties, such as the real and imaginary part of coupling coefficient, mode loss, can be determined [3]. With an accurate fitting, we can predict the reflectivity of longer Bragg gratings without time-consuming simulations, making the design process faster and more efficient.

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