Patent ID: 11966079
Assignee: HITACHI ENERGY LTD
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 19:
20. A spliced optical fiber comprising a first and a second polarization-maintaining optical fiber connected to one another at one of their ends by splicing, thereby forming a splice at their connection point, and a protection tube arranged around the spliced optical fiber and surrounding at least an uncoated section of the spliced optical fiber which includes the splice, a first end and a second end of the protection tube sealed to the spliced optical fiber by a first and a second sealing arrangement for protecting the splice against mechanical stress and/or moisture,
the protection tube having such a length that an uncoated section of the spliced optical fiber comprising the splice and a coated section of the spliced optical fiber at each end of the uncoated section are arranged inside the protection tube,
a first outer dual-shrink sleeve of the first and sealing arrangement and/or a second outer dual-shrink sleeve of the second sealing arrangement each comprising an outer tube and an inner tube, the first end and the second end of the protection tube arranged between the inner tube and the outer tube of the respective first and second outer dual-shrink sleeves,
at least one of the first and the second sealing arrangements comprising a capillary sleeve arranged partially inside the protection tube around a section of the spliced optical fiber, the capillary sleeve being sealed to the spliced optical fiber by an inner dual-shrink sleeve at a first end facing the splice and is sealed by the inner tube of the respective outer dual-shrink sleeve at a second end, and
said first end of the capillary sleeve being arranged between an inner tube and an outer tube of the respective inner dual-shrink sleeve, wherein the capillary sleeve is chosen to be longer than the inner tube of the second outer dual-shrink sleeve in longitudinal direction.