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CN-122029463-A - Optical fiber communication system, plastic optical fiber cable and active optical cable

CN122029463ACN 122029463 ACN122029463 ACN 122029463ACN-122029463-A

Abstract

An optical fiber communication system comprising a plastic optical fiber cable (10), a light emitting element (3, 3 ') formed of a micro LED array having a (a≥2) micro LEDs, and a light receiving element (4, 4') formed of a photodiode array having a photodiodes of a or more, wherein the plastic optical fiber cable (10) further has a cover layer on the outer side of a plastic optical fiber formed of 2 or more cores and a first sheath layer surrounding the cores, b (a≤b) or more cores among the 2 or more cores are effective cores for receiving light from the light emitting element, the cores are formed of an acrylic resin, and the plastic optical fiber cable (10) has a standing bending loss of 0.2dB or less when a bending radius r=3 mm.

Inventors

  • OKITA KOUSHI

Assignees

  • 旭化成株式会社

Dates

Publication Date
20260512
Application Date
20241018
Priority Date
20231019

Claims (16)

  1. 1. An optical fiber communication system, comprising: Plastic optical fiber cable, Light emitting element formed of micro LED array having a (a≥2) micro LEDs, and A light receiving element formed of a photodiode array having a photodiodes of a or more, The plastic optical fiber cable further has a cover layer on the outer side of the plastic optical fiber formed by more than 2 cores and a first sheath layer surrounding the cores, B (a≤b) or more cores of the 2 or more cores are effective cores for light receiving of light from the light emitting element, The core is formed of an acrylic resin, The bending loss of the plastic optical fiber cable at rest when the bending radius r=3mm is below 0.2 dB.
  2. 2. The fiber optic communication system of claim 1, wherein a and b satisfy 2 a-b-40 a.
  3. 3. The fiber optic communication system of claim 1, wherein a and b satisfy 3 a-b-10 a.
  4. 4. The fiber optic communication system of claim 1, wherein a and b satisfy 3 a-b-5 a.
  5. 5. The fiber optic communication system of claim 1, wherein the average thickness of the primary sheath is 0.5-5 μιη.
  6. 6. The optical fiber communication system according to claim 1, wherein a cross-sectional area ratio of the core to the first sheath (core/first sheath) is 99/1 to 70/30.
  7. 7. The optical fiber communication system according to claim 1, wherein the first sheath layer is formed of 1 or more resins selected from the group consisting of (1) tetrafluoroethylene-vinylidene fluoride copolymer, (2) fluorinated methacrylate-based polymer, and (3) ethylene-tetrafluoroethylene-based copolymer.
  8. 8. The fiber optic communication system of claim 1 having a second sheath surrounding a circumference of the first sheath, The second sheath layer is formed of a fluororesin different from the resin constituting the first sheath layer.
  9. 9. The fiber optic communication system of claim 1 having a second sheath surrounding a circumference of the first sheath, The second sheath layer is formed of a non-fluorine resin different from the resin constituting the first sheath layer.
  10. 10. The fiber optic communication system of claim 8, wherein the second sheath has a lower refractive index than the first sheath.
  11. 11. The fiber optic communication system of claim 9, wherein the second sheath has a lower refractive index than the first sheath.
  12. 12. The fiber optic communication system of claim 1, wherein there is a respective third sheath around the core.
  13. 13. The fiber optic communication system of claim 1, wherein the refractive index (n) of the primary sheath is 1.38 n 1.48.
  14. 14. The optical fiber communication system according to claim 1, wherein the cover layer is formed of a resin selected from the group consisting of a polyethylene-based resin, a flame retardant polyethylene-based resin, a polyamide-based resin, and a vinyl chloride-based resin.
  15. 15. A plastic optical fiber cable is used for an optical fiber communication system, The optical fiber communication system comprises a plastic optical fiber cable, a light emitting element formed by a micro LED array having a (a≥2) micro LEDs, and a light receiving element formed by a photodiode array having a or more photodiodes, The plastic optical fiber cable has a plastic optical fiber formed of more than 2 cores and a first sheath layer surrounding the cores, and has a cover layer on an outer side of the plastic optical fiber, B (a≤b) or more cores of the 2 or more cores are effective cores for light receiving of light from the light emitting element, The core is formed of an acrylic resin, The bending loss of the plastic optical fiber cable at rest when the bending radius r=3mm is below 0.2 dB.
  16. 16. An active optical cable carrying the optical fiber communication system of any one of claims 1 to 14.

Description

Optical fiber communication system, plastic optical fiber cable and active optical cable Technical Field The invention relates to an optical fiber communication system, a plastic optical fiber cable and an active optical cable. Background Conventionally, an optical fiber communication system has been used for optical data communication, in which a micro LED array having micro LEDs is used as a light emitting element and a photodiode array is used as a light receiving element. In such an optical fiber communication system, a plurality of micro LEDs are provided in a light emitting element, so that there is an advantage in that a large amount of optical data can be communicated (for example, refer to patent document 1). Prior art literature Patent literature Patent document 1 U.S. Pat. No. 11476942 Disclosure of Invention Problems to be solved by the invention However, in the conventionally known optical fiber communication system, the optical fiber constituting the optical fiber cable for optical data communication is a single fiber or the number of cores is smaller than the number of micro LEDs of the light emitting element, and therefore, a large amount of data needs to be converted into light according to the amount of data to be communicated and transmitted, which has a problem that the power consumption becomes high and the cost becomes high. In addition, in the optical fiber communication system, an optical fiber is often bent and installed in a device, but when an optical fiber cable including a glass optical fiber is used, there is a problem in that transmission failure due to breakage may occur. In view of such problems, there is known a multi-core plastic optical fiber having a larger core number than that of a conventional optical data communication optical fiber and suitable for image transmission applications, but there is a problem that, generally, when the bending radius of the plastic optical fiber is increased, the loss of light quantity is increased, the communication distance is shortened, and there is still room for improvement in bending loss at the time of bending the optical fiber. Accordingly, an object of the present invention is to provide an optical fiber communication system including a micro LED array having micro LEDs as a light emitting element and a photodiode array as a light receiving element, the optical fiber communication system including a plastic optical fiber cable having excellent mechanical strength resistance against bending, less communication errors, and excellent cost reduction. Solution for solving the problem The present inventors have made intensive studies to solve the above problems, and as a result, have found that the above problems of the prior art can be solved by determining the relationship between the number of micro LEDs constituting a light emitting element of an optical fiber communication system and the number of cores of a plastic optical fiber constituting a light receiving element and determining the standing bending loss at a bending radius r=3 mm, and have completed the present invention. Namely, the present invention is as follows. [1] An optical fiber communication system, comprising: Plastic optical fiber cable, Light emitting element formed of micro LED array having a (a≥2) micro LEDs, and A light receiving element formed of a photodiode array having a photodiodes of a or more, The plastic optical fiber cable further has a cover layer on the outer side of the plastic optical fiber formed by more than 2 cores and a first sheath layer surrounding the cores, B (a≤b) or more cores of the 2 or more cores are effective cores for light receiving of light from the light emitting element, The core is formed of an acrylic resin, The bending loss of the plastic optical fiber cable at rest when the bending radius r=3mm is below 0.2 dB. [2] The optical fiber communication system according to the above [1], wherein the a and the b satisfy 2 a≤b≤40 a. [3] The optical fiber communication system according to the above [1], wherein the a and the b satisfy 3 a≤b≤10a. [4] The optical fiber communication system according to the above [1], wherein the a and the b satisfy 3 a≤b≤5a. [5] The optical fiber communication system according to any one of the preceding [1] to [4], wherein an average thickness of the primary sheath layer is 0.5 μm to 5 μm. [6] The optical fiber communication system according to any one of the preceding [1] to [5], wherein a cross-sectional area ratio of the core to the primary sheath (core/primary sheath) is 99/1 to 70/30. [7] The optical fiber communication system according to any one of the preceding [1] to [6], wherein the first sheath layer is formed of 1 or more resins selected from the group consisting of (1) tetrafluoroethylene-vinylidene fluoride copolymer, (2) fluorinated methacrylate-based polymer, and (3) ethylene-tetrafluoroethylene-based copolymer. [8] The optical fiber communication system according to any one of the prece