| 摘要 |
PCT No. PCT/GB94/00180 Sec. 371 Date Aug. 1, 1995 Sec. 102(e) Date Aug. 1, 1995 PCT Filed Jan. 31, 1994 PCT Pub. No. WO94/17448 PCT Pub. Date Aug. 4, 1994A method of assembling a package including a photosensitively configured optical device providing a window positioned to allow optical frequency electromagnetic radiation from an external source to impinge on a photosensitive part of the optical device. In one embodiment a packaged intermediate product is fabricated, which may subsequently be formed into an external cavity semiconductor laser having certain specified characteristics, by writing a grating into a photosensitive fiber. Use of a window allows the characteristics of the laser to be defined after packaging so that, firstly a large stock of external cavity lasers having all possible characteristics need not be held, and secondly so that the reflectivity of the grating need be chosen only once the degree of coupling between the fiber and the laser diode has been established, thus enhancing the performance of the external cavity laser. |
