Relative Intensity Noise in a Two-Section Distributed Bragg Reflector Tapered Laser

The relative intensity noise (RIN) in a two-section distributed Bragg reflector (DBR) tapered laser emitting around 1060 nm is being studied experimentally. By analyzing the RIN spectra, a resonance frequency and damping is obtained. Herein, the dependence of the resonance frequency and the maximum RIN at the resonance frequency is studied as functions of the ridge waveguide (RW) and tapered section currents independently. The low frequency RIN is approximately -162 dB Hz-1, and the RIN peak at currents providing high output power is as low as -154 dB Hz-1. The observed nonlinearity of the squared resonance frequency with the RW section current is attributed to carrier saturation. The measured high values of the resonance frequency, exceeding 2.5 GHz for RW currents higher than 100 mA at a tapered current of 3 A, indicate gain lever enhancement. The relative intensity noise (RIN) of a two-section distributed Bragg reflector (DBR) tapered laser emitting at 1060 nm is examined experimentally. Crucial parameters such as resonance frequency and damping are derived through spectral analysis. These findings reveal intriguing nonlinearity in the squared resonance frequency and showcase high resonance frequencies exceeding 2.5 GHz, suggesting gain lever enhancement.image (c) 2024 WILEY-VCH GmbH