| 摘要 |
PURPOSE:To increase the input current for semiconductor laser used for a high-speed optical telecommunication system in order to realize a long-distance transmission. CONSTITUTION:The characteristic impedance between an input terminal 11 and a strip line 14 is matched to the output impedance of a drive circuit (for example, 50OMEGA), however, the impedance is set lower than the output impedance of the drive circuit when a thin-film resistor 14 and semiconductor laser 17 are viewed from the strip-line side (for example, when the input impedance of the semiconductor is 5OMEGA, the resistance value of the thin-film resistor 14 is set to 20OMEGA. |
