Optical fiber fixing system, optical fiber butting system and optical fiber fusion-splicing system

An optical fiber fixing system for fixing an optical fiber comprising:

• a fixing body comprising a first groove, formed in a first surface thereof, extending in a first direction to support the optical fiber along its axial direction and a second groove, formed in a second surface thereof, shaped to support the optical fiber, wherein the second groove extends in the first direction laterally adjacent to the first groove so that both the first and second grooves can axially support the optical fiber simultaneously, and the seconds surface of the fixing body is arranged above, and laterally adjacent to, the first surface of the fixing body to form a stepped structure;
• and
• a pressing body comprising a protrusion, formed on a first surface thereof, a longer part of the protrusion extending in a lateral direction, wherein said lateral direction is substantially perpendicular to the direction of the first groove, and
• wherein the first surface of the pressing body faces the first surface of the fixing body.