In this dissertation, we demonstrate that the 10Gbps coaxial DFB laser module packaging can not only achieve the high performance but also can keep low cost by employing the conventional TO-Can processes. The laser module has a built-in matching resistor to reduce the resonant phenomenon. In order to optimize the module’s performance, detailed equivalent circuit model is employed to investigate both the DFB laser diode and the coaxial package comprehensively. This study makes it possible to fabricate the 10Gbps coaxial laser modules in low cost while still maintaining the high performance by just using the existing low-cost TO-Can package technology. Previously, the high-performance 10Gbps coaxial laser modules have only been available by using complicated design, customized components, and specialized fabrication process that lead to high packaging cost. The subsequent content of this thesis is organized as follows.
Chapter 2 describes the equivalent circuit model of 10-Gb/s DFB laser diode. The comparisons of the theoretical and experimental results show a good agreement in frequency response. The fabrication procedures of the 10-Gb/s laser module are also described in chapter 2.
Chapter 3 presents the equivalent circuit model of proposed coaxial package and the theoretical study result. The measurement results of 10Gbps coaxial DFB laser modules are also described in Chapter 3. This uncooled 10Gbps laser module operates at a high temperature up to 105oC and maintains an eye mask margin above 28% in the full operational temperature range to meet the stringent requirements of 10Gbps Ethernet for long reach applications.
Chapter 4 describes the application of the 10-Gb/s BOSA modules by applying the 10-Gb/s coaxial laser module. A modulation bandwidth of 11.86GHz and an OC-192 eye diagram of 19% mask margin are obtained from the transmitter side. After 10-km single-mode-fiber (SMF) transmission, the mask margin for OC-192 eye diagram decreases
to 11%. For the receiver, an OC-192 eye diagram of 31% mask margin is obtained under back-to-back connections. The mask margin maintains at 29% after a 10-km SMF transmission. The measured crosstalk penalty is 0.9dB at the receiver side. These results indicate that the BOSA module is capable of a 10-Gb/s bi-directional transmission.
Chapter 5 describes another application of the 10-Gb/s coaxial laser modules. A 4channels x 10-Gb/s CWDM laser module are described. The fabrication and characteristic of the 4 channels CWDM laser module are also presented. The results of the 40-Gb/s optical module showed that the output optical power was above -1 dBm per channel and the system power penalty was 12 dB. The transmission distance with a single-mode fiber reached more than 30 km at a bit-error-rate of 10-9. This proposed high-performance 40-Gb/s CWDM optical module demonstrates not only the feasibility of a 30 km transmission, but also shows the low-cost possibility of ensuring the application of WDM-passive optical network (WDM-PON) fiber-to-the-home (FTTH) systems.
Chapter 6 draws the conclusions and the final remarks.
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