Abstract: The present invention is related to a method for fabricating a surface-emitting laser diode with a metal reflector. It is mainly the use of a combination of a metal reflector and wafer bonding technology to replace the traditional epiwafer process or high-temperature high-pressure wafer bonding technology in fabricating VCSEL Bragg Reflector. The metal reflector has high reflectance with its material selected to form ohmic contact with VCSEL material. Besides, the substrate for the metal reflector can be selected for cheap price and good heat dissipation. Further advantages include simple process, low production cost and good VCSEL characteristic etc.

Abstract: An innovated transimpedance amplifier circuit consists of a buffer circuit, a simulation resistance circuit, and an amplifier circuit. The buffer circuit for inputting a signal circuit is constituted by two FETs and a resistor, and has a high current input efficiency and function of widening circuit frequency band. The simulation resistance circuit is constituted by a resistor, two buffer units, a coupling capacitor, and a biasing resistor. When operating at a low frequency, the simulating resistance circuit permits a large amount of background DC to flow through; on the other hand, when operating at a high frequency, this circuit can improve the signal coupling efficiency and reduce foreign signal output voltage. On the whole, by the circuit of the present invention, both the detecting sensitivity and the amplification factor of the signal current can be significantly improved.