Performance of S-bends for integrated-optic waveguides

✍ Scribed by Apurva Kumar; Sheel Aditya

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 121 KB
• Volume: 19
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/(sici)1098-2760(199811)19:4<289::aid-mop13>3.0.co;2-y

✦ Synopsis

The performance of S-bends, which are used for connecting wa¨eguides offset with respect to each other, is ¨ery important in integrated-optic wa¨eguide circuits. Se¨eral approaches for the design of S-bends ha¨e been reported in the literature. These include, in particular, designs based on simple sinusoidal cur¨es as well as relati¨ely complicated, but more general, polynomial cur¨es. This paper reports a comparison of the calculated pure bend loss of such S-bends for a typical silica-based wa¨eguide operating at a wa¨elength of 1550 nm. It is shown that the simple cosine S-bands yield a performance which is close to that obtained from the general polynomial cur¨e-based S-bends. Design cur¨es are also presented for these two types of S-bends. The calculations are based on the analytical expression for bend loss proposed by Marcuse.