Title :
High-index overlay for high reflectance DBR gratings in LiNbO3 channel waveguides
Author :
Hussell, C.P. ; Ramaswamy, R.V.
Author_Institution :
Uniphase Telecomun. Products, Bloomfield, CT, USA
fDate :
5/1/1997 12:00:00 AM
Abstract :
A thin overlay of high refractive index material is used to obtain high reflectance DBR waveguides in lithium niobate. Silicon, deposited by e-beam evaporation, is found to be a suitable material for this purpose because of its high refractive index, transparency to 1.3- and 1.5-μm wavelengths, opacity to the visible spectrum, and ease of etching. Experimental results match the theory extremely well and, to the best of our knowledge, exhibit the highest reflection per unit length from a lithium niobate corrugated waveguide reported to date on on insulator technology, waveguide filters.
Keywords :
diffraction gratings; distributed feedback lasers; integrated optics; lithium compounds; optical waveguides; reflectivity; refractive index; transparency; vapour deposition; waveguide lasers; 1.3 mum; 1.5 mum; LiNbO/sub 3/; LiNbO/sub 3/ channel waveguides; e-beam evaporation; etching; high reflectance DBR gratings; high reflectance DBR waveguides; high refractive index; high refractive index material; high-index overlay; highest reflection; insulator technology; lithium niobate; lithium niobate corrugated waveguide; opacity; transparency; visible spectrum; waveguide filters; Distributed Bragg reflectors; Etching; Gratings; Insulation; Lithium niobate; Reflection; Reflectivity; Refractive index; Silicon; Waveguide theory;
Journal_Title :
Photonics Technology Letters, IEEE
