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EP0428951A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Optical divider for multimode optical fiber systems

Assignee: Mitsubishi Gas Chemical Co Inc
•
Filing: 1990-11-09
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Granted: —
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Expires: 2010-11-09
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Abstract

Abstract An optical divider for multimode optical fibers of GI type comprising an optical input section for securing input optical fiber, a branching section including an optical waveguide having rectangular sectional shapes irrespective of a kind of material or a method of fabricating the same and consists of a main optical waveguide and branch waveguides, and an optical output section for securing an array of output optical fibers, wherein the main optical waveguide having a width D and a length M is divided contiguously into three or more branch optical waveguides having uniform width W, the optical waveguide having substantially uniform core thickness T is specifically related with the core diameter K of the optical fiber to fulfill the following relational formulas: (1) 0.7 </= T/K </= 0.85 (2) 0.35 </= W/K </= 0.80 (3) 15 </= M/D </= 70 (4) D = N x W for reducing a coupling loss between the optical fibers and the optical waveguide and improving a loss variance by selecting the value of M/D to the value within the range as specified above or more preferably within a range of 20 </= M/D </= 60.

Inventors

  • 👤 Mitsuzo C/O Mitsubishi Gas Chem. Central Arii
  • 👤 Norio C/O Mitsubishi Gas Chem. Central Takeda
  • 👤 Shigeo C/O Mitsubishi Gas Chem. Central Kataoka
  • 👤 Osamu C/O Mitsubishi Gas Chem. Central Kondoh
  • 👤 Kuniaki C/O Mitsubishi Gas Chem. Central Jinnai
  • 👤 Hisashi C/O Mitsubishi Gas Chem. Central Ohwada
  • 👤 Tomoko C/O Mitsubishi Gas Chem. Central Kondoh

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-05 20:18
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/26; G02B6/30; G02B6/10; G02B6/12; G02B6/122; G02B6/125; G02B6/28; G02B6/2804; G02B6/2808

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 164 words
An optical divider comprising: an optical input section in which an input optical fiber is disposed; a branching section including an optical wave­guide, which consists of a main optical waveguide and a plurality of branch optical waveguides, for dividing input light into a plurality of optical systems; and an optical output section in which output optical fibers for taking out divided light are dis­posed; whereby said optical waveguide and said optical fibers are formed to satisfy the following relations: (1) 0.7 ≦ T/K ≦ 0.85 (2) 0.35 ≦ W/K ≦ 0.80 (3) 15 ≦ M/D ≦ 70 (4) D = N x W where, T is a core thickness of said optical waveguide, K is a core diameter of said input and output optical fibers, W is a width of said branch optical waveguide, M is a length of said main optical waveguide, D is a width of said main optical waveguide, and N is a number of branches of said branch optical waveguides.
Claim 2
Dependent Claim 164 words
An optical divider comprising: an optical input section in which an input optical fiber is disposed; a branching section including an optical wave­guide, which consists of a main optical waveguide and a plurality of branch optical waveguides, for dividing input light into a plurality of optical systems; and an optical output section in which output optical fibers for taking out divided light are dis­posed; whereby said optical waveguide and said optical fibers are formed to satisfy the following relations: (1) 0.7 ≦ T/K ≦ 0.85 (2) 0.35 ≦ W/K ≦ 0.80 (3) 15 ≦ M/D ≦ 70 (4) D = N x W where, T is a core thickness of said optical waveguide, K is a core diameter of said input and output optical fibers, W is a width of said branch optical waveguide, M is a length of said main optical waveguide, D is a width of said main optical waveguide, and N is a number of branches of said branch optical waveguides.
Claim 3
Dependent Claim 22 words
An optical divider as defined in claim 1, wherein said number of branches N of branch optical waveguides is three or more.
Claim 4
Dependent Claim 20 words
An optical divider as defined in claim 1, wherein said input and output optical fibers are of graded-index multimode type.
Claim 5
Dependent Claim 34 words
An optical divider as defined in claim 1, wherein said input optical fiber, said optical waveguide, and said output optical fibers are disposed and secured to respective substrate with use of a bonding agent.
Claim 6
Dependent Claim 18 words
An optical divider as defined in claim 1, wherein said optical waveguide is formed within a polymer film.
Claim 7
Dependent Claim 20 words
An optical divider as defined in claim 1, wherein said M/D is selected to be 20 ≦ M/D ≦ 60.

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