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Modal cutoff of an optical waveguide having a lemniscate of Bernoulli-type core cross section

✍ Scribed by Preeta Sharan; S. P. Ojha; P. Khastgir; P. K. Choudhury

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 100 KB
Volume: 14
Category: Article
ISSN: 0895-2477
DOI: 10.1002/(sici)1098-2760(19970220)14:3<170::aid-mop10>3.0.co;2-c

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✦ Synopsis

With the use of the scalar field approximation a study has been made of a guide ha¨ing a shape of the lemniscate of Bernoulli as its cross section. This structure represents approximately the situation when two cores are embedded in the same cladding. This is often done in ( practice. In this case one expects a kind of cross talk or coupling ) between the two cores . The present study incorporates a detailed analysis of the modal cutoff condition for such a guide. A comparati¨e study of the modal cutoff ¨alues of the present guide and the guides with cardiodic, circular, and elliptical cross sections has been reported. As a basis for comparison all these guides are assumed to ha¨e equal crosssectional areas. It has been found that the presence of two adjacent cores reduces the cutoff ¨alue, which ultimately proliferates the modes. ᮊ 1997

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