| 摘要 |
PCT No. PCT/GB94/02488 Sec. 371 Date May 30, 1996 Sec. 102(e) Date May 30, 1996 PCT Filed Nov. 11, 1994 PCT Pub. No. WO95/13552 PCT Pub. Date May 18, 1995An optical filter and method of filtering uses a multi-mode waveguide having a first number n modes and a second waveguide having a different number m modes are coupled in series, where n and m are integers and n>m, and where the interaction of different modes at the interface of the two waveguides filters an optical signal propagating through the waveguides to provide a desired response characteristic. A lateral offset between the central axes of the waveguides at their interface is changed to control the response of the filter. For a multiple wavelength optical source uses, a filter coupled in the optical cavity including a laser gain medium provides interaction of different modes at the interface of waveguides in the filter to filter an optical signal propagating in the cavity thereby providing an output signal with multiple peaks at different wavelengths with a predetermined spacing. |
