Semiconductor laser with tapered-rib adiabatic-following fiber coupler for expanded output-mode diameter
- 1 April 1997
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters
- Vol. 9 (4) , 425-427
- https://doi.org/10.1109/68.559376
Abstract
A new expanded-mode AlGaAs diode laser with reduced far-field divergence and 0.9 dB single-mode optical fiber coupling loss is demonstrated. This new laser achieves a two-dimensional (2-D) expansion of the fundamental output mode with a rib waveguide tapered in only one dimension. Stable fundamental-mode operation with a narrow, 5.7/spl deg/ by 7.40 full-width-at-half-maximum far-field divergence is observed well above lasing threshold. Tapered waveguide dimensions are compatible with conventional optical lithographic techniques, making this device suitable for mass production.Keywords
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