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The transmitting losses of several lower modes for four kinds of straight and bent circular hollow optical fibers (waveguide) made up with GeO_2 or SiO_2 and doped with PbO or Sb_2O_3 respectively are calculated. The results show that the HE_(11) mode has the minimum loss in straight waveguide and the loss of TM_(01) mode in bent waveguide is the minimun.
The results of the lower number of bending modes for four kinds of straight and bent hollow optical fibers (waveguide) made up with GeO_2 or SiO_2 and doped with PbO or Sb_2O_3 respectively are calculated. The results show that the HE_ (11) mode has the minimum loss in straight waveguide and the loss of TM_ (01) mode in bent waveguide is the minimun.