Free-space mode approximation for radiation modes of a slab waveguide and its application

✍ Scribed by Zi Hua Wang

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 82 KB
• Volume: 17
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/(sici)1098-2760(19980405)17:5<313::aid-mop11>3.0.co;2-4

✦ Synopsis

Taking the symmetric slab wa¨eguide as an example, we show that radiation modes of a weakly guiding planar optical wa¨eguide can be approximated by the free-space modes; their field expressions and normalization constants are simple and physically understandable, and can be obtained directly without any calculation. By applying this approximation, the far-field and radiation loss calculations caused by random wall imperfections ha¨e been greatly simplified.