Research And Implementation Of A Wavelength Division Multiplexed Single Fiber Bi-Directional Data Transceiver Module

In order to meet the rapid development of data centers,optical fiber interconnection technology progresses toward bi-directional(BiDi)transmission of wavelength division multiplexed signals in a single fiber.Minimized optical transceiver modules are required for such applications.In contrast to transmission of dense wavelength division multiplexed(DWDM)signals for telecom network applications,data centers usually employ coarse wavelength division multiplexing(CWDM)technology to reduce cost.Thus data transceiver module based on BiDi transmission and CWDM technology emerges as required.This thesis researches a compact data transceiver module based on hybrid integration for BiDi transmission of CWDM signals.The main work includes,The present CWDM and BiDi transmission technologies are analyzed.Based on this,a new structure of data transceiver module based on hybrid integration for BiDi transmission of CWDM signals is presented.Two CWDM chips based on integrated optics are employed as the multiplexer and de-multiplexer.A three-port optical circulator is used for BiDi transmission.A dual-core waveguide convertor is designed to realize hybrid integration of the transceiver module.The two ports on the left side of the waveguide convertor are coupled to the two CWDM chips functioning as the multiplexer and de-multiplexer,respectively.The other two ports on the right side function as port 1 and 3 of the optical circulator.The new structure integrates the optical circulator into the transceiver module,which is different from the current solutions requiring independent optical circulator outside the module.The transceiver module is minimized based on such hybrid integration.Design of the structure,parameters and mechanical assembly is accomplished for the presented data transceiver module.The two ports on the right side of the waveguide convertor are tapered to enlarge the core size.The mode size of the output is expanded and the collimated beam size in the optical circulator is compressed.Thus minimization design of the optical circulator is accomplished.The system parameters are calculated based on MathCAD software.The waveguide convertor is simulated with RSoft software.The optical system is simulated and optimized based on Zemax software.The mechanical structure and assembly are designed with SolidWorks software.An experimental scheme is designed for feasibility verification of the transceiver module.The elements for experiments are fabricated.The experimental platform for hybrid assembly of integrated optics and free-space optics is constructed step-by-step.A transceiver module sample is fabricated and the specifications are measured.The insertion loss of the transmitting and receiving optical paths is 9.2dB and 9.7dB,respectively.The minimum isolation is 23.8dB and 21.8dB,respectively.The four CWDM channels show equivalent specifications.The experimental results verify the feasibility of the proposed compact data transceiver module based on hybrid integration for BiDi transmission of CWDM signals.