Patent ID: 9244230
Filing Date: 2016-01-26
CPC Classification: G02B,H01P

Claim Text:
1. An optical transmitter comprising, an optical module; a printed circuit board; and an interconnecting circuit board configured to be electrically coupled, at one end of the interconnecting circuit board, to the optical module; and the interconnecting circuit board configured to be soldered and electrically coupled, at an other end of the interconnecting circuit board, to the printed circuit board in a surface-to-surface fashion; wherein the interconnecting circuit board comprises, on a bottom surface of the interconnecting circuit board to which the printed circuit board is coupled: a coplanar waveguide having a first end reaching an edge of the one end of the interconnecting circuit board; and a microstrip line including a signal wiring line and a ground wiring line, the signal wiring line of the microstrip line being extended from a second end of the coplanar waveguide, wherein the width of the signal wiring line of the microstrip line is narrower than the width of a signal wiring line of the coplanar waveguide, and the spacing between the signal wiring line extended from the second end of the coplanar waveguide and the ground wiring line is smaller than the spacing between the signal wiring line of the coplanar waveguide and the ground wiring line, and wherein the interconnecting circuit board further comprises, on a top surface of the interconnecting circuit board opposite to the bottom surface, a signal wiring line at a position corresponding to the signal line of the coplanar waveguide on the bottom surface, having a substantially same width as the signal wiring line of the coplanar waveguide, and wherein the interconnecting circuit board further comprises one or more through holes electrically connecting the signal wiring line of the coplanar waveguide on the bottom surface and the signal wiring line on the top surface.