We designed a novel core-suspended capillary fiber that the core was suspended in the air
hole and close to the inner surface of the capillary, and experimentally demonstrated its fabrication
technology. In addition, a method for linking a single mode fiber and a core-suspended fiber was
proposed based on splicing and tapering at the fusion point between the two fibers. By combining
with the optical time domain reflectometer technology, we constructed a distributed gas sensor
system to monitor greenhouse gas based on this novel fiber.