Li Xihua

Multimode-waveguide-based optical power splitters in glass

Low-loss glass-based buried multimode waveguides are fabricated by using the field-assisted Ag+-Na+ ion-exchange technique, and multimode optical power splitters are investigated. The measured loss of the multimode waveguides is lower than 0.1dB/cm, and the additional loss of the multimode optical power splitters is lower than 1.3 dB under the uniform splitting condition.

A Novel Coupled Quantum Well Structure with Low-Driving Voltage, Low Absorption Loss and Large Field-Induced Refractive Index Change

Based on a two-energy-level system, we analyse the changing ground eigenenergies of symmetric GaAs/AlxGa1−x As coupled quantum wells in the presence of an applied electric field. From the theoretical analysis for symmetric coupled quantum well, we find the advantages and disadvantages when it is applied to travelling wave modulator. Hence the conception of quasi-symmetric coupled quantum wells is put forward. Based on the demands of travelling wave modulator for quantum well materials, the configuration of quasi-symmetric coupled quantum well is further optimized. Consequently, in the case of low applied electric field (F = 20 kV/cm) and low absorption loss (α≤100 cm−1), a large field-induced refractive change Δn (for TE mode, Δn = 0.021; for TM mode, Δn = 0.0121) is attained in the optimized coupled quantum well.

Fabrication of an 8 8 Multimode Interference Optical Coupler on a BK7Glass Substrate by Ion-Exchange

Based on the principle of the graded-index multimode interference (MMI), an 8?8 MMI optical coupler is designed and fabricated by using K + -Na + ion-exchange technique on a BK7 glass substrate. The performance of the device is tested. The output of optical coupler has a high uniformity of approximately 0.72?dB.

Recent development of ion-exchanged glass waveguide technology

A brief review is given on the physical mechanism and the state-of-the-art of glass-based integrated optic devices by ion-exchange technology, after which an comprehensive introduction is made on our recent research work conducted on glass-based waveguide devices manufacturing, including ion-exchange technology investigation, device configuration optimization, and novel devices development, Emphasis being put on development of glass based integrated optical splitter for optical communication networks application. In the last part, a prospect is given on glass based hybrid optical waveguide, which is regarded as a promising solution to low-cost, high-performance, multifunctional integrated optic devices, for it combines the advantages of glass waveguide and functionalities of another material