Receiver optical sub-assembly

An optical transceiver mounting in a host device comprising:

• an optical connector for receiving a duplex optical connector, which includes a first fiber for transmitting an optical signal to the transceiver and a second fiber for transmitting an optical signal from the transceiver;
• a transmitter optical sub-assembly (TOSA) for generating an optical signal from an electrical signal when optically coupled to the second fiber;
• a receiver optical sub-assembly (ROSA) for generating an electrical signal from an optical signal when optically coupled to the first fiber;
• a housing for supporting the TOSA and the ROSA;
• an electronic circuit board mounted in the housing electrically connected to the TOSA and the ROSA;
• and
• an first electrical connector for electrically connecting the electronic circuit board to the host device;
• wherein the ROSA comprises:
• an optical coupler for receiving the optical signal from the first fiber along an optical axis;
• a photodiode disposed along the optical axis for receiving the optical signal and for converting the optical signal into an electrical current signal;
• an amplifier for converting the electrical current signal into a differential voltage signal, having the photodiode mounted thereon;
• a substrate, a first surface of which is connected to the optical coupler, and a second surface of which supports the amplifier, whereby the optical signal travels from the first surface through the substrate to the photodiode mounted on the amplifier;
• and
• a second electrical connector connected to the second surface for electrically connecting the amplifier to the electronic circuit board.

An optical sub-assembly for mounting in a host opto-electronic device and for optically coupling with an optical waveguide comprising:

• an optical coupler for transmitting an optical signal between the optical waveguide and the optical sub-assembly along an optical axis;
• a transducer disposed along the optical axis for converting optical signals from the waveguide into electrical current signals or for converting electrical signals from the host opto-electronic device to optical signals;
• a transducer control chip for converting the electrical current signal from the transducer into a differential voltage signal or for driving the transducer to produce optical signals, wherein the transducer is mounted on the transducer control chip;
• a substrate, a first surface of which is connected to the optical coupler, and a second surface of which supports the transducer control chip, whereby the optical signals travel through the substrate between the optical coupler and the transducer;
• an electrical connector connected to the second surface for electrically connecting the transducer control chip to the host opto-electronic device.