| 摘要 |
The present invention relates to a TO type laser apparatus capable of performing a long distance transmission by reducing the linewidth of a laser beam. The laser apparatus according to the embodiment of the present invention includes: a laser diode chip (100) which emits the laser beam, a wavelength selective filter, a collimating lens (200) which is installed on an optical path between the laser diode chip (100) and the wavelength selective filter and collimates the light emitted from the laser diode chip (100), a 45 degrees partial reflection mirror (300), and a photodiode (500) for monitoring an optical wavelength. A relation between the laser beam and the wavelength of an etalon filter is constantly maintained by controlling the temperature of a thermoelectric device to which the laser diode chip is attached or controlling the temperature of the etalon filter. The purpose of the present invention is to obtain a laser signal for performing a high speed modulation and a long distance transmission. |
