Manufacture of fiber fusion type optical coupler

Abstract

Abstract PURPOSE:To obtain an optional branching ratio which is larger than a branching ratio after an optical fiber is cooled by drawing the optical fiber to a specific branching ratio by heating and fusing the fiber, then cooling the fusion drawn part of the optical fiber, and further reducing the diameter of the fusion drawn part in a quartz fusible gas flow. CONSTITUTION:Optical fibers 2 and 4 which have the fusion drawn part 6 formed at their halfway part by a conventional method are clamped on fixing bases 8 and 10. The quartz fusible gas which flows out of a gas cylinder 14 through a valve 15 and a flowmeter 16 flows in the gas entrance 12a of a gas flow chamber 12 provided surrounding the fusion drawn part 6. This gas is made to operate on the fusion drawn part 6 to reduce the diameter of the fusion drawn part. Thus, the circulation time, concentration, heating temperature, etc., of the quartz fusible gas flow are adjusted to accurately adjust the branching ratio to a desired value.

Inventors

• 👤 Tadao Arima
• 👤 忠夫 有馬
• 👤 Koji Okamura
• 👤 浩司 岡村

Bibliographic Details