Patent ID: 8218974
Filing Date: 2012-07-10
Classification: H04B

Abstract:
1. An optical transmitter, comprising: a plurality of light-emitting elements that transmits optical outputs having crosstalk parts arising from optical outputs of adjacent light-emitting elements; a plurality of light-receiving elements that monitors said optical outputs from said light-emitting elements, converts said optical outputs into a plurality of photoelectric conversion currents, and outputs said plurality of photoelectric conversion currents; a linear operation circuit that receives said plurality of photoelectric conversion currents from said plurality of light-receiving elements, removes said crosstalk parts from said plurality of photoelectric conversion currents to form optical output monitor signals, and outputs said optical output monitor signals; and a drive circuit that receives said optical output monitor signals from said linear operation circuit and drives individually currents to apply to said light-emitting elements based on said optical output monitor signals, wherein said linear operation circuit solves a simultaneous linear equation and outputs said optical output monitor signals Xj, where Aij is an optical coupling efficiency between an i-th light-receiving element of said plurality of light-receiving elements and a j-th light-emitting element of said plurality of light-emitting elements or a value in proportion to said optical coupling efficiency, Σ j represents a summation in relation to j, m is an amount of the plurality of light-receiving elements, n is an amount of the plurality of light-emitting elements, and Bi is an i-th photoelectric conversion current of said plurality of photoelectric conversion currents.