14 May 2002 Novel optical fiber connector using long-period fiber gratings
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Proceedings Volume 4638, Optical Devices for Fiber Communication III; (2002) https://doi.org/10.1117/12.467469
Event: High-Power Lasers and Applications, 2002, San Jose, California, United States
A novel scheme of an optical fiber connector is proposed, which enables coupling between a passive device and two optical fibers without using any bulk optics. By using long-period fiber gratings (LPGs), appreciable coupling was obtained without the help of expensive and alignment-sensitive optics such as lenses and collimators. The incident beam that has been propagated along the core of a fiber is coupled to a cladding mode with a help of a LPG at first. The beam coupling between two fiber-ends occurs in the free-space through the claddings of both fibers. The coupled beam in the cladding of the second fiber is re-coupled to the core mode by the second LPG. The effective beam coupling is possible in this scheme due to the large diameter of the fiber cladding compared with the core. The large beam size reduces the divergence angle in the free space, which reduces the insertion loss. A passive device such as a DWDM filter can be inserted in the free space between the fiber ends. The working distance giving a 3 dB relative loss of the proposed connector was measured to be about 500 micrometers , which was 4-times longer than the case of the core-to-core coupling.
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Tae-Jung Eom, Tae-Jung Eom, Byeong Ha Lee, Byeong Ha Lee, } "Novel optical fiber connector using long-period fiber gratings", Proc. SPIE 4638, Optical Devices for Fiber Communication III, (14 May 2002); doi: 10.1117/12.467469; https://doi.org/10.1117/12.467469

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