Patent ID: 7476040
Filing Date: 2009-01-13
Classification: G02B,H01L,H01S

Abstract:
1. An optical sub-assembly comprising: an optical coupler for receiving an end of an optical fiber, which transmits a beam of light including an optical signal; a housing coupled to the optical coupler; a multi-layer ceramic package mounted on the housing and including ground and signal vias for transmitting first and second RF electrical signals with a specific RF signal impedance therethrough, the multilayer ceramic package comprising a plurality of ceramic layers and an internal wiring layer positioned between adjacent ones of the ceramic layers to transmit control signals laterally; a transducer mounted on the multi-layer ceramic package for converting the optical signal into the first and second RF electrical signals or for converting the first and second RF electrical signals into the optical signal; a lens mounted in the housing for relaying the beam of light between the optical fiber and transducer; and a multi-layer flexible circuit comprising a plurality of stacked layers including a ground layer and a signal layer providing transmission lines for transmitting the first and second RF electrical signals between the transducer and control electronics of a host device, one end of the multi-layer flexible circuit being supported by the multi-layer ceramic package and electrically connected to the transducer, the other end of the multilayer flexible circuit extending outwardly for connection with the control electronics of the host device; wherein the signal vias of the multi-layer ceramic package include first and second RF vias for transmitting the first and second RF signals and being surrounded by the ground vias at a distance providing the specific signal impedance.