Tapered rib adiabatic following fiber couplers in etched GaAs materials for monolithic spot-size transformation
| Autor: | Joel R. Wendt, Charles T. Sullivan, R.E. Smith, Gregory A. Vawter, John F. Klem, Hong Q. Hou |
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| Rok vydání: | 1997 |
| Předmět: |
Coupling loss
Materials science business.industry Physics::Optics Laser Waveguide (optics) Atomic and Molecular Physics and Optics Semiconductor laser theory Gallium arsenide law.invention chemistry.chemical_compound Optics Semiconductor chemistry law Optoelectronics Electrical and Electronic Engineering Radiation mode Photolithography business |
| Zdroj: | IEEE Journal of Selected Topics in Quantum Electronics. 3:1361-1371 |
| ISSN: | 1077-260X |
| DOI: | 10.1109/2944.658790 |
| Popis: | Design details and demonstration data are presented for an (Al,Ga)As monolithic tapered rib waveguide achieving modal spot-size transformation. The tapered rib adiabatic following fiber coupler structure (TRAFFIC) achieves two-dimensional (2-D) expansion of the output optical mode of single-transverse-mode semiconductor waveguide modulators and lasers using a one-dimensional (1-D) taper between noncritical initial and final taper widths which are compatible with optical lithographic techniques. Measurements are presented of total mode expansion losses between /spl sim/1.5-2.0 dB and semiconductor to single-mode-fiber waveguide coupling losses of /spl sim/0.5-1.0 dB for doped pin optical-modulator-type waveguides using the TRAFFIC waveguide. A semiconductor laser with a TRAFFIC tapered-rib mode-expansion section and measured coupling loss between the laser output and single-mode fiber of only 0.9 dB is described. Finally, a TRAFFIC Spot-size transformer for undoped waveguide modulators with total mode expansion losses of 1.84 dB and excellent modal behavior at 1.32-/spl mu/m wavelength is presented. The TRAFFiC structure is particularly well suited for integration with both active and passive etched rib waveguide devices. Fabrication is relatively simple, requiring only patterning and etching of the tapered waveguide and uniform-width outer mesa waveguide without any epitaxial regrowth. |
| Databáze: | OpenAIRE |
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