Several laser-to-fiber coupling schemes have been compared with regard to coupling efficiency. A coupling scheme with a cylindrical lens is simple and effective for enhancing coupling efficiency. As a mounting and aligning structure for the laser-to-fiber coupling with a cylindrical lens, a hybrid structure has been proposed using a copper mount on which two vee grooves are produced for aligning all optical elements without adjustment. Even though the mounting structures have been produced by machining, the average coupling efficiency of about 50% has been achieved when using a multimode optical fiber with a half acceptance angle of 3-4 degrees . The couplers have been successfully mounted in hermetically sealed laser packages, indicating feasibility and usefulness for practical applications.
Abxstruct-Some new optical pulse formats are investigated for solving practical problems in fiber optic communication systems. These pulse formats provide many advantageous features such as error monitoring capability, abundant timing information, uniform optical power utilization, stable detection of optical input, and so forth.It is shown that a modification of Personick's receiver design theory can be used for comparison of various optical pulse formats. The comparison suggests that for state-of-the-art fiber systems with moderate fiber loss and moderate repeater spacing, where no pulse equalization is required, some new classes of 1 binary digit converted to 2 binary digits (1B2B) or 2B3B formats will permit the realization of very simple and reliable repeaters for fiber optic digital transmission.A future low-loss fiber system may permit a very long repeater spacing with the help of equalization.In this case, application of the Experimental 6.3 Mbit/s and 100 Mbit/s transmissions demon-, correlative signal-processing technique is shown to be very promising.strate some advantageous features of these optical pulse formats.
Filtered and filter‐less full color iEL displays with 4.25″ diagonal size using TDEL structure have been developed. These results were provided by improvement of a fabrication process and using new RGB set of phosphor. In this paper, the characteristics and features of these devices are discussed.
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