The performance dependence of optically injection-locked 1.55 mm VCSELs by downstream signals in a bidirectional optical link on the degree of Rayleigh backscattered signal and modulation depth of the master DFB laser is studied. Such a study is important for operation in bidirectional WDM-PONs. Error-free upstream performance is achieved when the upstream signal to Rayleigh backscattering rati...

We report on a Q-switched VCSEL side-pumped 946 nm Nd:YAG laser that produces high average power blue light with high pulse energy after frequency doubling in BBO. The gain medium was water cooled and symmetrically pumped by three 1 kW 808 nm VCSEL pump modules. More than 1 W blue output was achieved at 210 Hz with 4.9 mJ pulse energy and at 340 Hz with 3.2 mJ pulse energy, with 42% and 36% sec...

1. Introduction The key part of the optical network module that we are proposingg1],2] is a two dimensional optical element consisted of the vertical cavity surface-emitting laser (VCSEL) arrays and the switching devices with optical lter. In this paper, we report on a study of the fabrication technologies of a distributed Bragg reeector (DBR) for VCSEL and optical lter for the switching device...

We numerically investigate the performance of Chinese herbal medicine (CHM) recognition using a time delay reservoir computing (TDRC) system consist vertical-cavity surface-emitting laser (VCSEL) subjected to optical feedback. A database 960 images from 12 CHM categories is used evaluate performance, most which contain many samples and have different backgrounds. The image feature vector masked...

Previously reported simulations have suggested that depositing thin layers of metal over the surface of a single-mode, etched air hole photonic crystal (PhC) vertical-cavity surface-emitting laser (VCSEL) could potentially improve the laser's side-mode suppression ratio by introducing additional losses to the higher-order modes. This work demonstrates the concept by presenting the results of a ...

Vertical-cavity surface-emitting lasers (VCSELs) emitting at 894.6 nm wavelength have been fabricated for Cs-based atomic clock applications. For polarization control, a previously developed technique relying on the integration of a semiconducting surface grating in the top Bragg mirror of the VCSEL structure is employed. More specifically, we use a socalled inverted grating. The VCSELs are pol...

The use of a high-contrast grating (HCG) as the top mirror in a vertical-cavity surface-emitting laser (VCSEL) allows for setting the resonance wavelength by the grating parameters in a post-epitaxial growth fabrication process. Using this technique, we demonstrate electrically driven multi-wavelength VCSEL arrays at ~980 nm wavelength. The VCSELs are GaAs-based and the suspended GaAs HCGs were...

We demonstrate a method for maintaining the maximum signal-to-noise ratio (SNR) of the signal obtained from the self-mixing sensor based on a vertical-cavity surface-emitting laser (VCSEL). It was found that the locus of the maximum SNR in the current-temperature space can be well approximated by a simple analytical model related to the temperature behavior of the VCSEL threshold current. The o...

We report on the modulation responses of an injection-locked vertical-cavity surface-emitting laser (VCSEL) measured using optical spin-polarization technique. reveal that weak injection locking is suitable to maintain a strong resonance response at high-frequency region depending linear birefringence VCSEL, unique feature response. The results can be reasonably reproduced with simulated ones b...

Abstract We propose and demonstrate a novel surface-grating vertical cavity surface emitting laser (VCSEL)-integrated amplifier/beam scanner. When the of VCSEL section is periodically etched, single slow-light mode which travels laterally into amplifier selected due to wavelength selectivity grating. The coupled slow light can be amplified with pumping above threshold. far field angle continuou...