Study And Design Of 100G MLSE WDM Optical Module

Entering the 21st century, the emergence and development of new technologies such as Mobile Internet, Cloud Computing and Internet of Things offers a broad space for businesses based on the Internet. Different kinds of innovative applications like high-definition video on demand, social networking sites, and micro letter emerge one after another. The deep changes of interconnected technology have brought great prosperity of communication, and information transmission has just ushered in the era of big data, when the transmission network with high speed and large capacity is needed to offer effective and accurate service for information interacting.Compared to the traditional electrical transmission, optical communication technology has the advantages of high bandwidth, stable transmission, strong anti-jamming, secrecy and relatively lower costs, which adapts to the requirements of the big data era and becomes the main application technology of current backbone transmission networks. Optical transceivers are responsible for photoelectric signal conversion, which plays the key role of the connection between signal transmission in the optical field and signal processing in the electric field. As the core components of optical communication, optical transceivers also continuously develop from the initial low speed types to the ones of higher rates with the improvement of transmission speed. At present,2.5G,10G and 40G transceivers have successfully implemented large-scale commercial applications, but as the traffic goes through explosive growth, such rates can not meet the needs of the present and future communication demands.100G or even higher rates transceivers will be the main optical transmission solution for in current and a relatively long period afterwards.As rate gets bigger, the dispersion effect becomes one of the main factors restricting the distance and quality of high speed transmission. Though coherent modulation technology can make good compensation for transmission damage caused by dispersion, the cost is relatively expensive, which is suitable for long backbone networks with more than hundreds of kilometers. Considering the cost control, for the applications of metropolitan area and data center transmission networks within 100km, operators tend to make deployment using low cost, low power consumption, compact pluggable transceivers. Due to the above requirements, this thesis studies and proposes a kind of high speed CFP transceiver solution based on the maximum likelihood sequence estimation (MLSE). The transmitter multiplexes 10G electrical signals in ten channels into 25G optical signals in four channels, which applies 10G laser and intensity modulation method; the receiver receives 25G optical signal of four channels by 10G monitors and demultiplexes them into original 10G electrical signals of ten channels after the optical signal is recovered with MLSE algorithm to compensate for high speed signal degradation.This thesis first makes a brief introduction to the development of optical communication and raises the application requirements. Combined with the specific requirements and agreements, the overall design scheme of the optical transceiver is presented, and then the detailed scheme design of the key circuits is done. Finally, it proves the feasibility of the scheme by testing various performance indicators of sample modules. Results show that the CFP design scheme can satisfy the application requirements as well as reduce the cost.