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This paper describes a new active optical alignment method that is developed for the alignment of optical fibers to planar waveguide in order to improve the precision and efficiency of that. A new coupling mode, which is a polynomial function, is rebuilt by simplifying effect factors of the light field coupling process, such as angular offsets and line offsets. The optimum curve which is calculated to fit those sampling points by taking advantage of the least square method assists to locate the maximum coupling point of the alignment. Simulation results show that the alignment of two single mode fields is improved into 0.1μm precision with only 6 sampling points by the new method instead of 0.4μm offset with average 21.4 sample points by hill-climbing method. Using this alignment method, a fiber-to-waveguide, high-efficient coupling that provides higher accurate alignment with less sampling points is achieved.

Aiming at problems of planar optical waveguide aligning and coupling multi-dimensional space sub-micron motion error, with using topology theory, estimating distribution of motion error paramount precisely, this paper establishes position model of precise motion platform, based on Monte Carlo method, obtains precise position distribution of fiber end point. The result indicated that this method can obtain accurate position in the adjust process of planar optical waveguide automatic aligning and coupling, and achieve effective control of aligning and coupling accuracy.

Optical fiber array is a key component in the assembly of planar optical waveguide devices and enable greater channel counts than previously. However, assembling optical fiber array has been a challenge due to the stringent performance and reliability requirements posed by optical fiber communication applications. This paper investigates the causes of the failures involving the adhesive including: surface contamination, air entrapment, uneven curing, curing shrinkage; and thermal expansion coefficient mismatch.

Micro V-groove is an important optical component in the packaging of optoelectronic devices, which holds the position of the optical fibers. The micro V-groove can be fabricated by three main techniques on different materials: wet etching, ultra precision machining and molding press. The main parameters, which determine the micro V-groove quality, include core pitch, surface roughness and cured adhesive height. In this paper, three fabrication techniques are discussed to address the future needs of the next-generation optical fiber communication technology. The advantages and disadvantages of each fabrication technique are discussed with the quality issues. The findings can be served as guides for the materials and fabrication in micro V-groove in optoelectronic packaging.

Organic light-emitting diodes (OLEDs) with inserting an ultrathin sol–gel titanium oxide (TiO2) buffer layer between the ITO anode and hole transport layer (HTL) were fabricated. The carrier injection and the device efficiency were affected by surface morphology of TiO2, which was changed by different plasma pre-treatment of ITO. Treated by CF4 plasma, the TiO2 layer is the smoothest, and treated by H2 plasma it is like island. The TiO2 layer like island is favor of carrier injection from the anode, which was attributed to the point discharged.