Optical waveguides – Polarization without modulation
Reexamination Certificate
2007-10-30
2007-10-30
Font, Frank G. (Department: 2883)
Optical waveguides
Polarization without modulation
C385S012000, C385S024000, C385S123000, C385S126000, C372S006000, C356S073100, C356S460000
Reexamination Certificate
active
10937495
ABSTRACT:
A polarization-maintaining optical fiber which exhibits an excellent polarization-maintaining performance and significantly low splice loss when spliced with a polarization-maintaining optical fiber having a cladding 125 μm in diameter even if the polarization-maintaining optical fiber has a small-diameter cladding of about 80 μm. The polarization-maintaining optical fiber includes a core, a pair of stress-applying parts provided radially outwardly with respect to the core, and a cladding which surrounds the core and the stress-applying parts. With a diameter D of the stress-applying parts between 21 μm and 32 μm, a distance R between the stress-applying parts between 6 μm and 17 μm, and a relative refractive index difference Δ between 0.3% to 0.5%, a sufficiently large mode field diameter (MFD) is obtained; thus splice loss can be reduced.
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Himeno Kuniharu
Itoh Tatsuya
Izoe Katsuaki
Sakaguchi Yukihiro
Chiem Erin D.
Fujikura Ltd.
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