title: Mode matching and insertion loss in ultrabroadband Cr-doped multimode fibers.
abstract: We investigate the fundamental insertion loss due to mode mismatch in an optical link involving a single-mode fiber-optic (SMF) transmission with the insertion of a segment of a multimode Cr(4+)-doped fiber (MMCDF). With an MMCDF core diameter of approximately 15.5 microm that matches the SMF, we obtained coupling efficiencies of 60.3% to 87.5% in the entire transmission spectral range of 1,300 to 1,600 nm. The high coupling efficiency (or low insertion loss) makes it possible for the employment of the MMCDF as an inline ultrabroadband optical amplifier in an optical link for the entire transmission spectral range.
authors.affiliation: Institute of Electro-Optical Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan.
authors.forename: Szu-Ming
authors.initials: SM
authors.lastname: Yeh
authors.forename: David Jui-Yang
authors.initials: DJ
authors.lastname: Feng
authors.forename: Yen-Chieh
authors.initials: YC
authors.lastname: Huang
authors.forename: Tsong-Sheng
authors.initials: TS
authors.lastname: Lay
authors.forename: Sheng-Lung
authors.initials: SL
authors.lastname: Huang
authors.forename: Pochi
authors.initials: P
authors.lastname: Yeh
authors.forename: Wood-Hi
authors.initials: WH
authors.lastname: Cheng