Patent ID: 6857792

Claim:
A duplex light transceiver module comprising: a body having a light receiving module, a light transmitting module, and an optical fiber adaptor; the light emitting module having a laser diode chip and a metal header bearing the laser diode chip; the laser diode chip having one end being connected to one electrode of the metal header and another end of the laser diode chip being connected to another electrode of the metal header through a conductor wire; and a metal cap covering the metal header; characterized in that: the metal cap of the duplex transceiver module is combined with a round cylindrical focusing element which is installed ahead a light emitting end of the laser diode chip; one end of the cylindrical focusing element is formed with a ramp; a wavelength-division medium is evaporation-coated upon the ramp of the cylindrical focusing element; the wavelength-division medium has different permeability so that light at one side facing the optical fiber adaptor will reflect light totally and light at one side facing the optical transmitting module will pass through the wavelength-division medium; wherein when light emitted from the light transmitting module transmits into the round cylindrical focusing element; and then is further transmitted to a core of the optical fiber adaptor; when light emitted from the optical fiber adaptor; said light will be reflected by the wavelength-division medium to the light receiving module.