Yangtze Optical Fibre and Cable Joint Stock Limited Company

Zhiyong Wang

Mingfeng Mao

Ruichun Wang

Lei Zhang

Shengya Long

Runhan Wang

Hongyan Zhou

Yiwen Wu

Raadjkoemar Matai

Mengxun Sun

Ming Ye

A single-mode fiber with a large effective area comprises a core layer and a cladding layer. The core layer is cladded with an intermediate cladding layer, and a depressed cladding layer is provided outside the intermediate cladding layer. The core layer comprises a first fiber sub core layer having a radius rof 1.5-5 &#x3bc;m and a relative refractive index difference &#x394;nof 0.05-0.22%, and a second sub core layer having a unilateral radial width (r&#x2212;r) of 1.5-5 &#x3bc;m and a relative refractive index difference &#x394;nof 0.15-0.34%, where &#x394;nis less than &#x394;n. Accordingly, the optical fiber can reach an effective area equal to or greater than 120 &#x3bc;mwhen the related parameters thereof are optimized.

Single mode optical fiber with large effective area

In one aspect of the invention, the bend insensitive single-mode optical fiber includes a core layer and cladding layers having an inner cladding layer, a trench cladding layer and an outer cladding layer sequentially formed surrounding the core layer from inside to outside. For the core layer, the diameter is 7-7.9 &#x3bc;m, and the relative refractive index difference &#x394;is between 4.6&#xd7;10and 6.5&#xd7;10. For the inner cladding layer, the diameter is 16.5-20 &#x3bc;m, and a relative refractive index difference &#x394;is between &#x2212;3&#xd7;10and 3&#xd7;10. For the trench cladding layer, the diameter is 33-40 &#x3bc;m, and the relative refractive index difference &#x394;is between &#x2212;2.9&#xd7;10and &#x2212;7.3&#xd7;10, changes in a gradient manner and increases gradually from outside to inside, where a relative refractive index difference &#x394;at an outermost interface is smaller than a relative refractive index difference &#x394;at an innermost interface.

Bending insensitive single mode optical fiber

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Hubei, China

Zhiyong Wang