All-fiber spot-size transformer for efficient free-space optical interconnecting devices

Kyung Rok Kim, Kyunghwan Oh

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


A new concatenated configuration of optical fibers is proposed to improve misalignment tolerance and working distance in a free-space optical interconnection. The structure is composed of three segments: a thermally expanded core fiber, a coreless silica fiber, and a claddingless graded-index fiber. A numerical analysis for the design of each fiber segment is performed completely, and the device characteristics are experimentally evaluated in terms of the tolerances for a 1-dB coupling-loss increment against longitudinal, transverse, and angular misalignments.

Original languageEnglish
Pages (from-to)6261-6266
Number of pages6
JournalApplied Optics
Issue number31
Publication statusPublished - 2003 Nov 10

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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