Patent ID: 6843607

Claim:
A three-storied optical communications module comprising: a top case having a first set of M (M<1) photodiodes for receiving M-channel λ 2 light signals, bottom holes, electric wirings and leadpins; a silicon bench having M parallel longitudinal V-grooves, M parallel lightwaveguides following the V-grooves, a first wavelength division multiplexer slantingly mounted midway across the lightwaveguides for reflecting the λ 2 light signals and allowing λ 1 light signals to pass, a second wavelength division multiplexer slantingly mounted halfway across the lightwaveguides for reflecting λ 3 light signals and allowing the λ 1 light signals to pass, and M laser diodes mounted at rear ends of the lightwaveguides for generating the M-channel λ 1 light signals and introducing the M-channel λ 1 signals into the lightwaveguides; a middle case having a connector maintaining beginning ends of M-channel optical fibers with tails supported on the V-grooves of the silicon bench, bottom holes, electric wirings, leadpins and the silicon bench; a bottom case having a second set of M photodiodes for receiving M-channel λ 3 light signals, electric wirings and leadpins; the top case, the middle case and the bottom case being coupled in a body, and a transparent resin filled in the top, middle and bottom cases, the electric wirings of the top case being electrically separated from the electric wirings of the middle case, the electric wirings of the middle case being electrically separated from the electric wirings of the bottom case, the λ 1 light signals being emitted from the laser diodes, passing the first wavelength division multiplexer and the second wavelength division multiplexer and going into the M-channel optical fibers, the λ 2 light signals being input from the M-channel optical fibers, propagating in the lightwaveguides, being reflected by the first wavelength division multiplexer passing the bottom holes of the top case and entering the first set of photodiodes on the top case, and the λ 3 light signals being input from the M-channel optical fibers, propagating in the lightwaveguides, being reflected by the second wavelength division multiplexer, passing the bottom holes of the middle case and entering the second set of photodiodes on the bottom case.