3results about How to "Increase output optical power" patented technology

The invention provides a wavelength-controlled pump MOPA laser and a method of operation thereof. A monolithic semiconductor MOPA laser chip (100) has a DFB-laser based master oscillator (120) and a power amplifier section (130) formed in a same monolithic waveguide, and separate MO and PA electrodes (111,112) for individual control of current injection into the MO and PA sections. The laser wavelength is defined by the DFB grating (150) and is kept fixed by suitably controlling the MO current to compensate for a thermal crosstalk from the PA section, or tuned by suitably changing the MO current or direct heating of the DFB region. Stabilisation may be performed with a photodetector at the output and a look-up table in order to control the currents provided to the MO and the PA section.

The laser and the optical module provided by the present disclosure, the laser comprises an N-InP substrate layer and a buried zone P-InP substrate layer. The active layer and the grating layer are arranged in the buried zone. The P-InP layer has strong absorption to the optical field due to the high free carrier concentration, resulting in optical loss. The introduction of the doped layer with high refractive index in the N-InP substrate layer makes the optical field deviate to the N-InP substrate layer, thereby reducing the optical absorption loss of the P-InP layer. The buried zone comprises a first connecting area, a second connecting area and a third connecting area, and the sidewalls of the three connecting areas are formed based on different etching processes. The first connecting area is formed based on dry etching, and the bottom surface of the first connecting area is located above the active layer to avoid damage to the active layer during the dry etching process. The second connecting area is formed based on a surface treatment process. The third connecting area is formed based on wet etching, which ensures that the first doped layer is not etched too much to protect the doping characteristics of the doped layer.

The utility model provides a lens array structure, and aims to solve the problems of unstable connection between a lens array and an optical fiber, low optical transmission efficiency, high assembly difficulty and the like in the prior art. The structure is characterized in that a lens array can efficiently couple laser emitted by a laser into an optical fiber through optical design; the optical fiber patch cord is matched with the limiting groove of the lens array through a cylindrical anchor point, so that high-precision positioning is realized; the optical fiber glue injection bin can inject UV glue or matching liquid with the same refractive index as the optical fiber, the unevenness of the fracture surface of the optical fiber is optimized, and the optical transmission effect is improved; a tight package positioning point and a loose package positioning point between the lens array and the laser or photodiode substrate realize rapid positioning and preliminary fixation of the lens array. According to the utility model, through multi-dimensional innovative design, the optical transmission efficiency, the assembly precision and the structural stability are obviously improved, and the device is suitable for the fields of optical communication, laser processing and the like.