Mode-filtering and mode-selecting method in multi-mode waveguide, and waveguide amplifier, semiconductor laser, and VCSEL using the method
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United States of America Patent
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Aug 16, 2005
Grant Date -
Jun 17, 2004
app pub date -
Dec 11, 2002
filing date -
Dec 11, 2002
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Abstract
Disclosed is a mode-filtering and mode-selecting method in a multi-mode waveguide, and a waveguide amplifier, a semiconductor laser, and a VCSEL using the method. These optical elements include a cladding region that has a periodically changed refractive-index structure, thereby obtaining a mode-filtering or mode-selecting function, which in turn allows only a single mode in the transverse direction to propagate along the waveguide. By forming the periodic index-variation structure, the EDF, the semiconductor laser, and the VCSEL achieve a single mode operation although the cross-sectional area is much larger than that of the prior art, consequently realizing a high-performance or high-power single-mode amplifier and laser.
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