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Li H.,State Key Laboratory for New Optical Communication Technologies and Networks | Li H.,Accelink Technologies Co | Ma W.-D.,State Key Laboratory for New Optical Communication Technologies and Networks | Ma W.-D.,Accelink Technologies Co | And 8 more authors.
Guangdian Gongcheng/Opto-Electronic Engineering | Year: 2011

Optical communication system requires the high isolation and low polarization sensitivity of Tunable Optical Filter (TOF). At present, the most of TOF based on thin film are hard to meet this requirement. The reason of TOF transmission spectrum degradation is analyzed by simulation. Referring to the center wavelength and bandwidth separation when different polarization beam in tilted incidence, an optimization design is proposed based on symmetric optical path. It improves the isolation of TOF to more than 30 dB, and restrains the polarization dependent loss within 0.2 dB. Meanwhile, different polarization beam have the same optical path because of the symmetric optical path, which can avoid adding additional wave plate. The module performance is tested, which realizes that 96 ITU-T channels can be tuned in the range of C band. The experiment results are in good agreement with the analytical ones. Source

Wang D.-L.,Accelink Technologies Co | Wang D.-L.,State Key Laboratory for New Optical Communication Technologies and Networks | Liu W.,Accelink Technologies Co | Liu W.,Huazhong University of Science and Technology | And 4 more authors.
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2011

It is difficult to obtain a nanoimprint stamp with low cost and high quality in fabrication of Distributed Feedback (DFB) gratings. In this paper, the quartz stamp for semiconductor DFB gratings was fabricated by using double-layer metal mask and lift-off lithography. Firstly, the photoresist pattern of a DFB grating was written on a Ti coated quartz substrate by electron beam lithography, then a layer of metal Ni was sputtered on it to obtain a corresponding pattern by metal lift-off technology. Finally, the Inductively Coupled Plasma (ICP) dry etching was used to transfer the pattern on the quartz substrate. The scanning electron microscope image of the fabricated stamp shows good uniformity with sufficiently low line edge roughness. The stamp is suitable to fabricate DFB grating for 1310 nm semiconductor laser diodes using UV nanoimprint lithography. Source

Hu Q.,Huazhong University of Science and Technology | Hu Q.,Accelink Technologies Co | Hu Q.,State Key Laboratory for New Optical Communication Technologies and Networks | Liu D.,Huazhong University of Science and Technology | And 6 more authors.
Guangxue Xuebao/Acta Optica Sinica | Year: 2010

The wavelength selective switch (WSS) is now considered to be the most important wavelength engine technology, and will be the key component of next-generation optical networks for carriers all over the world. A novel WSS is theoretically and experimentally presented in this paper, which implements an one dimensional MEMS mirror to realize the function of wavelength switching, while the Hitless switching is achieved by a MEMS attenuator. Compared with traditional WSS implementing two dimensional MEMS mirror to achieve the two functions simultaneously, this novel WSS is manufactured based on mature technologies, so it is cost-effective and productive. The maximum attenuation of 34 dB, insertion loss of 6.4 dB, dispersion range of -1.64~6 ps/nm are reported, indicating a high uniformity with the simulation results. Source

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