Patent ID: 6552365
Filing Date: 2003-04-22
Classification: G02B,G02F

Abstract:
A photoelectric converting semiconductor device, comprising:a board; a signal line formed and extending on said board; a ground line formed on said board and extending spaced apart from said signal line; a resistance portion formed on said board and electrically connecting said signal line to said ground line; and a photoelectric converting semiconductor element mounted on said board to cover said signal line and said ground line, electrically connected to said signal line and said ground line and receiving a modulation signal transmitted from a power feed portion for transmitting the modulation signal, to modulate and output a received light; wherein impedance is substantially the same as impedance of said power feed portion; and in order to suppress variation of the impedance when said photoelectric converting semiconductor element is mounted on said board, arrangement relation of said signal line and said ground line positioned in an area where said photoelectric converting semiconductor element is mounted is made different from arrangement relation between said signal line and said ground line positioned in an area where said photoelectric converting semiconductor element is not mounted, said signal line and said ground line positioned in the area where said photoelectric converting semiconductor element is not mounted extend spaced by a first distance as said distance; and said signal line and said ground line positioned in the area where said photoelectric converting semiconductor element is mounted extend spaced by a second distance wider than said first distance an additional ground line arranged on a side opposite to the side on which said ground line is positioned along the direction of extension of said signal line, and electrically connected to said ground line; wherein said photoelectric converting semiconductor element has an electrode portion electrically connecting said ground line to said additional ground line; and width of said signal line is narrower than said signal line width in a photoelectric converting semiconductor element not having a power feed electrode.