发明授权
- 专利标题: Multi-wavelength optical reflector
- 专利标题(中): 多波长光反射器
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申请号: US09306449申请日: 1999-05-06
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公开(公告)号: US06345135B1公开(公告)日: 2002-02-05
- 发明人: Douglas Charles John Reid , David James Robbins , Gert Jaak Anna Sarlet
- 申请人: Douglas Charles John Reid , David James Robbins , Gert Jaak Anna Sarlet
- 优先权: GB9809583 19980506
- 主分类号: G02B634
- IPC分类号: G02B634
摘要:
A multi-wavelength optical reflector comprises a diffraction grating structure (18) which comprises a plurality of repeat grating units (20) in which each grating unit (20) comprises a series of adjacent diffraction gratings (22, 24, 26) having the same pitch. The grating units (20) and adjacent gratings within a grating unit are separated by a phase change (28) of substantially pi (&pgr; radians). The lengths of the gratings (22, 24, 26), which are different for each grating within a grating unit, are selected so as to provide a predetermined comb reflection spectrum which comprises a plurality of reflection maxima of substantially equal reflectivity.