Patent ID: 7561805
Filing Date: 2009-07-14
Classification: G02B,H01L,H01S

Abstract:
1. An optical transmitter configured to transmit a laser beam through an optical fiber, comprising: a case; a laser beam generating unit in the case and configured to generate the laser beam; a first support member in the case, and having a first wiring pattern and configured to support the laser beam generating unit; a board in the case, and having a second wiring pattern, and a notched portion containing the first support member and the laser beam generating unit; a first wire in the case, and configured to connect the first wiring pattern and the second wiring pattern; a second support member positioned in the notched portion and having a third wiring pattern; a photo diode positioned in the notched portion, supported by the second support member, electrically connected to the third wiring pattern, and configured to measure the laser beam generated by the laser beam generating unit; a second wire in the case, and electrically connecting the second wiring pattern and the third wiring pattern; a driver on the board, the driver being electrically connected to the laser beam generating unit through the first wiring pattern, the first wire, and the second wiring pattern, and configured to drive and control the laser beam generating unit; a cooling unit in the case; a high heat conductivity member in the case, contacting a top surface of the cooling unit, disposed under the first support member, and having higher heat conductivity than the case; and a low heat conductivity member in the case, contacting a half of a top surface of the high heat conductivity member, and having lower heat conductivity than the high heat conductivity member, wherein the case comprises an Fe—Co—Ni alloy, the high heat conductivity member comprises copper tungsten, a distance between a side surface of the case and an optical axis of the optical fiber is equal to or less then 3.5 millimeters, and the case has a width of 6 millimeters, a length of 13 millimeters, and a height of 6 millimeters.