Research And Development Of Tunable And Precise Dispersion Compensator Based On G-T Etalons

We know that the dispersion and loss are two major aspects to restrict thedevelopment of optical communication technologies. With the successful development ofoptical amplifiers, the loss of fiber is not principal factor that confine the development ofoptical communication, however, as the amplifier is an analog device, it can not berenewable on the signal, while the signal is transmitted, pulse broadening as a result ofdispersion will lead to a serious inter-symbol interference, dispersion has become the mainfactor to limit the high-speed fiber-optic communication systems and long-rangedevelopment. Therefore, dispersion compensation must be addressed if a system isupgrade to160Gbit/s and above and the realization of long-distance transmission rate. Inthis paper, a new program of the tunable dispersion compensation is proposed, it is a newtype of dispersion compensation device based on cascaded Gires-Tournois etalons bypricise temperature regulation. The program draws on G-T etalons made up of cascadedsingle-cavity dispersion compensation device make up for the shortcomings ofsingle-cavity, with compensation for the advantages of large bandwidth. At the same time,we achieve the precision adjustable dispersion compensation through temperaturecontrolling.First，this paper introduced the classification of tunable dispersion compensationdevice and its role in optical communication. The current international and domesticdevelopment and development trend in dispersion compensation is reviewed. Comparedwith each other, understand the importance of developing tunable dispersion compensator.And then stared with the theory of multi-beam interference, presents the principle of theG-T etalon interferometer, describe its working principle and the characteristics affectedby temperature. In order to facilitate the design of the structural parameters, we build amathematical model. After the analysis, we re-created the production of experimentalsamples and finished the tests，and produced a presise temperature control circuit. In thispaper, we introduce all the steps of the laboratory samples. At the same time, we test thelaboratory samples, and get the actual parameters and curves of the loss and dispersioncompensation value. With the comparison of the theoretical value, the tunable dispersioncompensator can get-1150ps/nm dispersion compensation value and20GHz bandwidth.