A novel waveguide filter for reducing crosstalk in optical cross connection and switching in all-optical networks

✍ Scribed by Lee Zhengbin; Jeffrey S. Fu; Fen Engxin; Fu Jumei

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 248 KB
• Volume: 24
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/(sici)1098-2760(20000205)24:3<197::aid-mop16>3.0.co;2-s

✦ Synopsis

A no¨el filter structure is presented in this paper to reduce the crosstalk in cross connection and switching in all-optical networks ( ) based on dense wa¨elength-di¨ision multiplexing DWDM . Following the principle of an optical film filter, the filter is constructed by a dielectric wa¨eguide with the wa¨eguide boundary or the wa¨eguide itself discontinuous in the transmitting direction. As the propagation phase constant ␤ does not change in the wa¨e propagating direction z, the wa¨eguide system can be considered as a homogeneous dielectric medium with effecti¨e refracti¨e index n in this direction. Because the effecti¨e e refracti¨e index n changes with the thickness or parameters as n of the e i wa¨eguide at a gi¨en field mode, we arrange different n alternately as an e optical film filter. After pro¨ing this kind of wa¨eguide's filtering properties, the design principle and an example are gi¨en, which will be ¨ery useful to reduce the crosstalk in optical cross connection and switching in all-optical networks based on DWDM. This kind of filter can be easily connected to other related components.