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1

A multimode interference polymer-silica hybrid waveguide 2×2 thermo-optic switch

Sun X. Q., Chen C. M., Wang F., Sun J., Gao W. N., Gao L., Zheng H. L., Kang C. P., Zhang D. M.

Optica Applicata

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2010

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Vol. 40, nr 3

737--745

EN

A polymer-silica hybrid 2×2 thermo-optic switch is demonstrated. The top cladding and core layer are composed of polymers, while the bottom cladding is made of silica. Since polymer and silica have opposite signs of thermo-optic coefficients, the change of the refractive index of the core is opposite to that of the bottom cladding as the temperature increased. With the finite difference beam propagation method (FD-BPM) and thermal coupling simulation, the proposed device presents a crosstalk of 20 and 18 dB at bar state and cross state, respectively. The device also exhibits extinction ratios of 19 and 27 dB at each state. In addition, the low absorption of material and simple structure of the device enable the insertion loss to be 17 dB. Also the electrical power consumption is about 45 mW at ? = 1.55 mm. The rise time and fall time of switching are 0.2 ms and 0.4 ms, respectively.

2

Formulized analytical technique for gain characteristics of phosphate glass Er3+/Yb3+ co-doped waveguide amplifiers

Wang Y.H., Ma C.S., Li D.L., Zhang D.M.

Optica Applicata

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2008

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Vol. 38, nr 2

329-339

EN

Novel formulas for analyzing the gain characteristics of the phosphate glass erbium-ytterbium (Er3+-Yb3+) co-doped waveguide amplifier (EYCDWA) are derived from the rate equations and the light propagation equations under the uniform dopant and steady-state conditions. In the derivation of these formulas, we have neglected the amplified spontaneous emission (ASE) and have introduced the initial energy transfer efficiency. By using these formulas, the effects of the pump power, signal power, dopant concentration and waveguide length on the gain characteristics of the EYCDWA are analyzed, the comparison is performed between the EYCDWA and the singly erbium-doped waveguide amplifier (EDWA), and some useful results are obtained.

3

Effect of bending on transmission characteristics of polymeric arrayed waveguide grating multiplexers

Qin Z.K., Ma C.S., Li D.L., Li H., Zhang D.M., Liu S.Y.

Optica Applicata

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2008

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Vol. 38, nr 2

315-327

EN

In terms of the transmission theory of the arrayed waveguide grating (AWG), parameter optimization is performed, and bending effect of arrayed waveguides on transmission characteristics is analyzed for a 33×33 polymeric AWG multiplexer around the central wavelength of 1550.918 nm with the wavelength spacing of 0.8 nm. Analytical results show that the bending of arrayed waveguides causes the phaseshift of the light propagating in the AWG, results in the shift of the transmission spectrum, and brings about the variation of the crosstalk. For the designed AWG device, the Shift of the transmission spectrum is about 0.01 nm, which is much less than the wavelength spacing of 0.8 nm.

4

Design of athermal arrayed waveguide grating using silica/polymer hybrid materials.

Li D. L., Ma C. S., Qin Z. K., Zhang H. M., Zhang D. M., Liu S.Y.

Optica Applicata

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2007

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Vol. 37, nr 3

305-312

EN

This study demonstrates a novel athermal arrayed waveguide grating (AWG) which is composed of silica/polymer hybrid materials on a silicon substrate. The temperature-dependent wavelength shift of the AWG depends on the refractive indices of the materials and the size of the waveguide. The athermalization of the AWG can be realized by selecting the proper values of the material and structural parameters of the device.