Theoretical And Experimental Studies About Novel Arrayed-waveguide Devices

Waveguides have become essential device's basis in optical networks. The performance of waveguides is very important to influence the communication quality of the optical communication system. These devices such as multiplexer/demultiplexer, optical power splitter, wavelength-decoded optical detect arrayed-module, have become the focus for research. In this dissertation, several theoretical and experimental studies about novel arrayed-waveguide devices have been carried out as the followings: (1) This paper analyzes the characteristic of arrayed-waveguide gratings with the linear systems theory and the optical grating equation is educed. An optimal designing method for AWG is mentioned. A 32×0.8nm AWG multiplexer designed for an example with a center wavelength 1.54851μm is given. (2) A novel FD-BPM is put forwarded which enhance the modeling precision, not needing much more time. Introduce the simulation software based on the FD-BPM. Analyze and calculate the transmission mode in the AWG in detail. Calculate the optical power distributing and the spectrum response in 1×4 ,1×8 and 1×32 AWGs. (3) A scheme for novel polarization-insensitive AWG based on polarization-sensitive theory is proposed. Using this method, the intrinsical polarization-sensitivity of AWG can be overcome simply. The method, which improves the coupling efficiency between rectangular waveguide and fiber, is also studied. (4) Novel scheme for fabricating the AWG waveguide material using ion beam assisted deposition (IBAD) is brought forward firstly. Experimental results show that the performances of AWG including polarization-sensitivity and thermal stability are improved. (5) Theoretical model for novel AWG based on straight waveguide is established. The optimal designing method for novel AWG is particularly described. Theoretical simulations for novel AWG using FD-BPM show that this kind of AWG has good performance. The properties of the graded-index slab are analyzed. The important conclusion that the optical field on the back focal plane of the GISLAB is directly proportional to the Fourier transform of the object has been drawn and it has been validated through experiment. (6) An online measure method for the photosensitivity of fiber is proposed. This method has high precision. The relationship between the refractive index of fiber and exposal time is the same as the absorbing model that is brought forward by H. Patrick. The method is very accurate and has high practicality. The photosensitivity of fiber is investigated. The changing rate of the fiber refractive index can reach 1%, and the refractive index is uniform along the cross section of the fiber. The experiment is useful for the research of the photosensitivity of the waveguides. (7) A novel technique to fabricate 1×32 100GHz DWDM adopting Interleaver is studied. The influence that the two-grade Interleaver exerts on the device has been theoretically calculated. The optimal design method has been proposed. (8) A 1×32 100GHz AWG is produced. Based on it, the wavelength-choice optical receiving module is manufactured which realizes the integration between demultiplexer and detectors. This Module has a small size and high working stability, its output performance is good enough to match the application of communication systems, and it has passed the identification of experts. (9) A novel optical power splitter is devised. This device is simple, easy-fabrication and easy-upgradtion. The insert-loss and ununiformity of the device is theoretical calculated, its performances satisfy the actual application. The influence that the position mismatch exerts on the coupling efficiency is analyzed .The theory is very useful for the coupling assembly of the device.