Title:
OPTICAL DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/130426
Kind Code:
A1
Abstract:
The present invention comprises a plurality of cores and cladding that surrounds the outer circumferential surfaces of the cores and has a lower refractive index than the cores. Along the long direction, each of the cores has a large diameter section, a taper section, and a reduced diameter section, and the refractive index of each of the cores gradually increases from outer circumference to center. For each of the cores, the radial-direction distance r (μm) from center, the refractive index n(r) at distance r, the relative refractive index difference Δ (%) of the center with respect to the cladding, the radius r0 (μm), and a constant α satisfy expressions (1)-(4), and the wavelength λ (nm) of light propagated by the core and the ratio R of the diameter of the core pre-reduction to the diameter of the core post-reduction satisfy expressions (5) and (6). (1) n(r) = Δ∙[1-(r/ro)-α] (0 ≤ r ≤ r0), (2) 0.9 <Δ < 1.2, (3) 22.5 < r0 < 27.5, (4) 1.9 <α < 2.2, (5) 1530 ≤ λ ≤ 1625, (6) 5581.5/λ < R < 9582.4/λ.
Inventors:
UEMURA HITOSHI (JP)
TAKENAGA KATSUHIRO (JP)
TAKENAGA KATSUHIRO (JP)
Application Number:
PCT/JP2016/055602
Publication Date:
August 03, 2017
Filing Date:
February 25, 2016
Export Citation:
Assignee:
FUJIKURA LTD (JP)
International Classes:
G02B6/02; G02B6/036
Foreign References:
| JP2013142791A | 2013-07-22 | |||
| JP2015521300A | 2015-07-27 | |||
| JPS51123650A | 1976-10-28 | |||
| JP2009509199A | 2009-03-05 | |||
| JP2014016472A | 2014-01-30 | |||
| JP2015152774A | 2015-08-24 | |||
| JP2014506682A | 2014-03-17 | |||
| JPS51144658A | 1976-12-11 | |||
| JP2013020086A | 2013-01-31 |
Attorney, Agent or Firm:
MORIMURA Yasuo et al. (JP)
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