Accession Number:

ADA461780

Title:

Wafer-Fused Optoelectronics for Switching

Descriptive Note:

Journal article

Corporate Author:

CALIFORNIA UNIV SANTA CRUZ SCHOOL OF ENGINEERING

Report Date:

1998-12-01

Pagination or Media Count:

8.0

Abstract:

Wafer fusion technique for realization of compact waveguide switches and three-dimensional 3-D photonic integrated circuits is investigated theoretically and experimentally. Calculations based on beam propagation method show that very short vertical directional couplers with coupling lengths from 40 to 220 micrometers and high extinction ratios from 20 to 32 dB can be realized. These extinction ratios can be further improved using a slight asymmetry in waveguide structure. The optical loss at the fused interface is investigated. Comparison of the transmission loss in InGaAsP-based ridge-loaded waveguide structures with and without a fused layer near the core region, reveals an excess loss of 1.1 dBcm at 1.55 micrometers wavelength. Fused straight vertical directional couplers have been fabricated and characterized. Waveguides separated by 0.6 micrometers gap layer exhibit a coupling length of 62 micrometers and a switching voltage of about 2.2 V. Implications for GaAs-based fused couplers for 850 nm applications will also be discussed.

Subject Categories:

  • Electrooptical and Optoelectronic Devices

Distribution Statement:

APPROVED FOR PUBLIC RELEASE