A planar optical waveguide comprises at least two cladding layers on a substrate with at least one core layer disposed between the cladding layers. The overcladding layer of the two layers is doped in order to produce a thermal coefficient of expansion close to or equal to that of the substrate in order to reduce the polarisation sensitivity of the device.
申请公布号
US5930439(A)
申请公布日期
1999.07.27
申请号
US19970942189
申请日期
1997.10.01
申请人
NORTHERN TELECOM LIMITED
发明人
OJHA, SURESHCHANDRA MISHRILAL;BRICHENO, TERRY;CURETON, CLIFFORD GRAHAM;DAY, STEPHEN;MOULE, DAVID JOHN