Design And Experimental Study Of 1×8 Wavelength Selective Switch

Optical fiber,which has huge frequency band resource and outstanding transmission performances,is an ideal media to realize high speed and data transmission.As the development of fiber-optical communication technology,optical wavelength division multiplexing networks are widely applied.Wavelength selective switch is a key device in optical wavelength division multiplexing networks,which is mainly used in optical exchanging system and main-spare changing system.Namely,wavelength selective switches realize the functions that choosing route,choosing wavelength,cross connecting and self-healing protecting,etc.This thesis focuses on wavelength selective switch system based on micro-electromechanical systems technology.An 1×8 series structural wavelength selective switch consists of optical switch arrays with double-faced trigonal prism mirrors,narrow-band optical filter arrays and optical fiber collimator was researched.The main research contents are as follow:1.The 1×8 wavelength selective switch was designed,which consists of 8 optical switches in series,8 narrow-band optical filter,and 10 optical fiber collimator.The relationship of solenoid drive and exciting current in solenoid driven flexible polyimide-cantilever was calculated in theory.Combining with the analysis by finite element modeling software,the parameters of permanent magnet were optimized.Besides,the modal analysis of cantilever with coils was presented.2.Choosing optical performances as the references,the materials and structure of each component of wavelength selective switch were confirmed,including optical fiber collimator,film interference filter,polyimide-cantilever,permanent magnet,double-faced trigonal prism mirror,etc.The method based on photolithography technology to fabricate double-faced coil with photosensitive polyimide was presented.Furthermore,the optical switch arrays with double-faced trigonal prism mirrors were fabricated based on the results.3.The adjustment method for 1×8 wavelength selective switch was developed.The fixtures and adjusters of each components were designed.Adjustment and fixing for 8 double-faced trigonal prism mirrors,8 film interference filter,and 10 optical fiber collimator were accomplished,and the system was capsulated.4.Based on the principles of optical fiber coupling in free space,the insertion losses in wavelength selective switch were analyzed.The test system for response time and insertion losses was designed and established,and the response time and insertion losses in 1×8 wavelength selective switch were tested.The results indicated that response time was about 20 ms and the maximum single channel insertion loss was 1.741 dB in the wavelength selective switch.