Patent
1985-09-05
1988-02-23
Laroche, Eugene R.
350 9621, G02B 628
Patent
active
047266430
ABSTRACT:
An optical star coupler having a biconically tapered optical star coupler inserted and suspended in a protection tube and the method for manufacturing the same are disclosed. The manufacturing method provides that an optical fiber bundle is inserted into a protection tube such as hollow glass tube, then the optical fiber bundle is twisted and pulled while it is indirectly heated through the protection tube, thereby forming a twisting, fusing and pulling portion. Both ends of the protection tube are then sealed with an adhesive agent to fix the optical fiber bundle to the protection tube. This optical star coupler can be constructed so as to be connected in tandem without any splicing. The optical star coupler of the present invention, in the case of an optical star coupler using multi-mode optical fibers, and particularly in the case of one equally divided optical star coupler using single-mode optical fiber, also provides low insertion loss, less power deviation and low manufacturing costs.
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patent: 4377403 (1983-03-01), McLandrich
patent: 4439221 (1984-03-01), Smyth et al.
Rawson, E. G. et al., "Bitaper Star Couplers w/ 100 Fiber Channels", Electronic Letters, vol. 15, No. 14, 7/5/79, pp. 432-433.
Imoto, K. et al., "New Biconically Tapered Fiber Star Coupler: Structure and Fabrication", Electronic Letters, vol. 21, No. 11, 5/23/85, pp. 514-515.
Araki Hiroshi
Ikuta Yasushi
Imoto Katsuyuki
Kameyama Masayoshi
Maeda Minoru
Hitachi , Ltd.
LaRoche Eugene R.
Mottola Steven J.
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