Development of CdS-Doped Glass Optical Fibers for All-Optical Switching

摘要

We have successfully fabricated samples of CdSSe-doped fibers made from RG630Schott glass and designed for single-mode operation in the 1300nm and 1550nm communication wavelength region. The linear absorption coefficient of the CdSSe-doped fiber was measured to be 0.14 dB/cm. A comparison between the measured transmittance of a sample of 350 micrometer O.D. fiber and a bulk rod of RG630 Schott glass shows the two to have similar characteristics. That is, (1) the absorption edge of the fiber and the RG630 are found to be the same and near 630nm, and (2) the region of maximum transmittance occurs beyond 680nm for both fiber and RG630. The transmittance remains relatively constant for wavelengths greater than 68Onm. These results point to the fact that the fabrication of the fiber yielded good samples. Also we have developed an experimental procedure to gain switch the probe signal. This capability will be employed for time synchronization of pump and probe in the switch implementation. We have measured the nonlinear refractive index of the RG630 glass at 1313nm. The nonresonant nonlinear refractive index for a CdSSe-doped fiber has been determined experimentally, at a wavelength of 1313nm and found to be 1.8 x 10(exp-17) m squared/W. In comparison. silica fiber has an n(2) value of 4.2 x 10(exp-20) m squared/W.