| 摘要 |
Disclosed is an optical fiber ( 20 ) having a centermost laterally-elongated core ( 30 ) having a short dimension (a), a long dimension (b) and a first refractive index (n<SUB>1</SUB>), a moat ( 40 ) surrounding the central laterally-elongated core, the moat ( 40 ) having a second refractive index (n<SUB>2</SUB>), an outer dimension (c) and an outer dimension (d), and a cladding ( 50 ) surrounding the moat ( 40 ), the cladding ( 50 ) having a third refractive index (n<SUB>3</SUB>), wherein n<SUB>1</SUB>>n<SUB>3</SUB>>n<SUB>2</SUB>, a ratio of b/a is between 1.5 and 5.0, and a ratio of d/a is between 2.0 and 7.0. The fiber exhibits polarization maintaining properties in a PMB situated below (i.e., at shorter wavelength than SPB), such that beat length normalized to 1550 nm wavelength is preferably less than 10 mm. The fiber ( 20 ) may be coupled to optical components in apparatus where single polarization or polarization maintaining properties are desired.
|
