Grating Distributed Bragg Reflector Laser Research Articles

Design of Sampled Grating Distributed Bragg Reflector Laser with Wide Tuning Range in L-band

Design of Sampled Grating Distributed Bragg Reflector Laser with Wide Tuning Range in L-band

Single-Wavelength Silicon Evanescent Lasers

The silicon evanescent device platform provides electrically pumped active device functionality on a low-loss silicon-on-insulator waveguide platform. We present here recent research in the area of single-wavelength silicon evanescent lasers that utilize distributed feedback, distributed Bragg reflector (DBR), and sampled grating (SG) DBR laser topographies.

Modulation bandwidth of planar circular grating distributed bragg reflector lasers

This paper presents an analysis of the 3-dB-modulation bandwidth in planar circular grating distributed Bragg reflector lasers. The theoretical model takes into account both the spatial hole burning effect and the transverse and longitudinal field distribution. That model allows the study of the influence of real structure parameters on the 3-dB-modulation bandwidth.

Monolithically integrated multiwavelength sampled grating DBR lasers for dense WDM applications

For accurate control of the channel spacing in fabricating multiwavelength laser arrays or discrete multicolor lasers, we proposed a novel approach that exploits sampled grating distributed Bragg reflector (DBR) mirrors to vary the laser wave length across the wafer. This approach can realize a set of lasers with a wavelength spacing that meets the ITU recommendations for dense wavelength-division multiplexing systems and a wavelength range that can cover up to 40 nm or more. The wavelength variation across an array is achieved by changing the sampling periods of the DBR mirrors from laser to laser. The accuracy on the channel spacing of sampled grating DBR laser arrays was shown to be the same as that of conventional distributed feedback or DBR laser arrays, but their wavelengths can be better controlled for the gratings are fabricated with single holographic exposure. Arrays of 21 lasers have been successfully fabricated and have around 0.8-nm wavelength spacing with a simple tuning mechanism.

Sampled grating DBR laser arrays with adjustable 0.8/1.6 nm wavelength spacing

The difficulty in fabricating multiwavelength laser arrays with uniform wavelength spacing is overcome by using sampled grating distributed Bragg reflector (DBR) lasers as the constituent of a laser array. The sampling periods of the DBR mirrors are varied from laser to laser to provide reflection combs with different spacings in wavelength. Arrays of twelve lasers have been successfully fabricated with a single holographic exposure step. The wavelength spacing among the lasers can be adjusted to be around 0.8 or 1.6 nm with a simple tuning mechanism.

Measurement for Scattering Media by Synthesis of Optical Coherence Function with Super-Structure Grating Distributed Bragg Reflector Laser Diode

The application of the technique of synthesis of optical coherence function for detection in scattering media is investigated. By modulating the optical frequency, the technique synthesizes the coherence function into a delta-function-like peak at an arbitrary location, and thus can select interferometrically the information at that location. The location is adjustable by the modulation parameter or additional phase modulation. A multi-section super-structure grating distributed Bragg reflector laser diode (SSG-DBR-LD) of THz-order tunable range is employed to enhance the spatial resolution for suppressing the multiple scattering from locations other than that detected. In a preliminary experimental demonstration, a reflectometry of 550 μm spatial resolution was achieved and was used to detect scattering media.

Design and fabrication of circular grating coupled distributed Bragg reflector lasers

The design and fabrication of circular grating surface emitting lasers are presented. The influence of device parameters on the mode selection is described. The fabrication of an InGaAs/GaAs circular grating distributed Bragg reflector (DBR) laser is presented. Significant improvement is obtained by using a quantum-well structure with a multistack and an etch-stop layer. A threshold current as low as 15 mA and an output power in excess of 170 mW without saturation are obtained. The potential of circular grating DBR laser arrays for multiwavelength operation is demonstrated.

Circular grating DFB and DBR semiconductor lasers: threshold current analysis

The threshold current is analyzed for distributed feedback (DFB) and distributed Bragg reflector (DBR) semiconductor lasers with circular gratings. It is shown that in circular grating DFB lasers, the threshold current becomes minimum at a certain cavity radius, while in circular grating DBR lasers it increases monotonically as the active region radius increases.