title: Two-step K(+)-Na+ and Ag(+)-Na+ ion-exchanged glass waveguides for C-band applications.
abstract: A two-step K(+)-Na+ and Ag(+)-Na+ ion-exchange technique is introduced to fabricate single-mode channel waveguides in BK7 glass for the telecom-wavelength region. The dependencies of insertion loss, polarization-dependent loss (PDL), end bending loss of curved waveguides on channel width, diffusion time, and annealing time are investigated. Results show that postannealing is a required process for improving waveguide properties and an optimal annealing time exists. Although relatively narrow mask openings are used in most one-step ion-exchange processes, a wider channel width, to as wide as 10 microm, is preferred for this two-step method. The minimum coupling loss to/from single-mode fiber and the propagation loss is found to be 0.4 dB and 0.3 dB/cm, respectively. For 5-cm-long waveguides the PDL is less than 0.1 dB. For the S-bend structure the cosine curve exhibit apparently a lower bending loss than the double-arc curve.
authors.affiliation: The authors are with Microelectronics Research Center, J. J. Pickle Research Campus, The University of Texas at Austin, 10100 Burnet Road, Austin, Texas 78758, USA.
authors.forename: Jizuo
authors.initials: J
authors.lastname: Zou
authors.forename: Feng
authors.initials: F
authors.lastname: Zhao
authors.forename: Ray T
authors.initials: RT
authors.lastname: Chen