We report what is, to our knowledge, the first demonstration of strong Bragg reflection gratings operating at ~1550 nm written using standard phase mask techniques in a novel multimode fiber. A reflectivity of >98% and a bandwidth of <0.5 nm in very good agreement with modeling predictions have been observed.
A variety of ball-lens based optical add/drop multiplexers (OADMs) are designed and implemented. Insertion losses as low as 0.5 to 0.6 dB for the reflection light-path, and 1.2 to 1.5 dB for the transmission light-path are demonstrated. The 0.5-dB passband and -30 dB stopband for 100-GHz OADM are 0.35 nm and 1.15 nm, respectively. The reflection path has an isolation 15 dB. In addition to the distinct cost advantage of ball lenses over the GRIN lenses, the ball-lens based OADMs also offer a significant simplification in packaging due to the intrinsic spherical symmetry of ball lenses. Optical designs and optics-related packaging issues are discussed in detail.
In this paper, we reported, for the first time to our knowledge, that polycrystalline germanium-dioxide has a n < 1 and the extinction coefficient becomes smaller than other materials given at 10.6 micrometers , n is 0.27 and K is 0.51, we also exactly measured the infrared reflective spectra of polycrystalline germanium-dioxide from the input angle 20 degree to 70 for wavelengths between 2 and 25 micrometers . Our measuring results are compared with an exact calculation, and the agreement is found to be excellent. On the other hand, in order to study on the properties of polycrystalline germanium-dioxide for the materials of hollow-core fiber in detail, we fabricated a hollow-core fiber by use of this material. After then, we measured the straight optical fiber losses, the transmission properties of the bending fiber and the spot size of the fiber's output beam, we found that the high order mode degenerate quickly with the increase of the length and the nonuniform in the structure of fiber causes the loss of all kinds of modes. We further found that the different focal length of coupling Len causes different bending loss and the diameter of the output beam depends strongly on the existence of transmission mode in the fiber, meantime, the transmission rate of fiber depends strongly on the divergence angle (theta) .
An all-around research has been made for the properties of the polycrystal GeO2 hollow-core fiber. Based on the transmission properties of this kind of fiber, a coupling system with three lenses has been designed for the first time, which ensures the practical application of these fibers.
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