Er (3 +) / Yb (3 +) Co-doped Phosphate Glass Waveguide Amplifier Design And Production

Ignoring the amplified spontaneous emission(ASE) and excited - state absorption(ESA), the rate equations for integrated erbium-ytterbium co-doped waveguide amplifiers(EYCDWA's) pumped with 980nm wavelength is analyzed using overlapping methods in this paper. The effects of erbium-doped concentration, ratio of ytterbium -doped concentration to erbium-doped concentration, pump power, amplifier length and overlapping between the lateral distribution of doped ions(Er3+ and Yb ^concentration and that of the light(pump and signal) field intensity inside erbium-ytterbium co-doped waveguide on the gain characteristic of EYCDWA's are discussed , and compared with erbium-doped phosphate glass optical waveguide amplifiers(EDWA's). Numerical results demonstrate, with the sensitization of Yb3+, that the gain of EYCDWA's is apparently higher than that of EDWA's, and it is possible to fabricate higher gain and super-shorter (centimeter order) EYCDWA's.Planar and channel waveguides( with optical lithography) are fabricated in erbium/ytterbium co-doped phosphate glass substrate. The mode refractive index of 632.8nm wavelength, which propagates in ion-exchanged planar waveguides ,is obtained by m line technology; the near figure for channel waveguide with 632.8nm,650nm and 1550nm waveguide is obtained, respectively. Experiment demostrates that when the waveguide exists three modes for 632.8nm wavelength there exists single mode for 1550nm wavelength . The refractive index profile of planar waveguide is obtained with inverse WKB method by measured mode refractive index, which is well consistent with complentary error function.Finally, the gain characteristic of Er3+/Yb3+ co-doped phosphate glass waveguide amplifiers fabricated with ion-exchange is mearsured, the results show that for an 3.8dB small signal gain is achievable at a pump power HOmW. for 1.8cm length EYCDWA's.