| 摘要 |
PURPOSE:To obtain a small-sized, high density multiplexer which has low loss, a wide band, and low noise by constituting the multiplexer integrally with a laser. CONSTITUTION:A laser array 11 is incorporated directly instead of an array of optical fibers for incidence and only one optical fiber 12 for projection is therefore used. This laser array 11 has four mutually-sectioned light emission parts 11-1a, 11-1b, 11-1c, and 11-1d, which are controlled precisely to four mutually different wavelengths by distributed feedback type Bragg reflectors (DFB) 11-2a, 11-2b, 11-2c, and 11-2d which are formed closely to the respective light emission parts and differ in grating interval slightly from one another. Individual lasers are driven independently by respective electrodes 11-3a, 11-3b, 11-3c, 11-3d, and 11-4. Projection light from the laser array 11 is invariably linear polarized light and an S wave to all diffraction gratings, realizing high-efficiency, wide-band, and stable diffraction. |
