Patent ID: 8131122
Filing Date: 2012-03-06
Classification: B82Y,G02B,H01S,H04B,H04J

Abstract:
1. A monolithically integrated single-fiber multi-directional transceiver comprising a laser 10 for transmitting a first optical signal at a first wavelength, a photodetector 30 for receiving a second optical signal at a second wavelength, and a 2×2 4-port optical coupler 20 , said optical coupler 20 being structured such that it receives the second optical signal from an optical fiber 50 at port 1 and directs it to port 2 which leads to the photodetector 30 where the second optical signal is absorbed, whereas an optical waveguide connecting port 3 and port 4 within the coupler 20 is placed inside the cavity of the laser 10 so that a portion of the light generated inside the cavity and launched from port 3 is coupled to port 4 and therefore remains in the cavity as an optical feedback while the other portion of the light is coupled to port 1 and is transmitted to the same optical fiber 50 .