Mode-filtering and mode-selecting method in multi-mode...

Details Mode-filtering and mode-selecting method in multi-mode... Mode-filtering and mode-selecting method in multi-mode...

2005-08-16

2005-08-16

Font, Frank G. (Department: 2883)

Optical waveguides

Optical fiber waveguide with cladding

With graded index core or cladding

C385S126000, C385S037000

Reexamination Certificate

active

06931187

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.

REFERENCES:
patent: 6625182 (2003-09-01), Kuksenkov et al.
patent: 2003/0072525 (2003-04-01), Sjodin et al.
patent: 2003/0118289 (2003-06-01), Watts et al.

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