Bi-directional Dense Wavelength Division Multiplexed Systems for Broadband Access Networks

Broadband access;Wavelength division multiplexing;Optical networks

Akanbi, Oladeji Bamidele ; Electrical and Computer Engineering

University:Georgia Institute of Technology

Department:Electrical and Computer Engineering

关键词: Broadband access;    Wavelength division multiplexing;    Optical networks;   

Others  :  https://smartech.gatech.edu/bitstream/1853/13964/1/akanbi_oladeji_b_200612_phd.pdf.pdf

美国|英语

来源: SMARTech Repository

【 摘 要 】

Dense wavelength division multiplexing (DWDM) is becoming the technology of choice for meeting the increasing bandwidth demands in optical networks. DWDM has been used to increase the capacity of long-haul optical transport systems. Efforts are being made to move DWDM into the broadband access network serving residential and business subscribers. First, a new centralized DWDM PON scheme is demonstrated for bi-directional upstream and downstream transmissions. The proposed DWDM PON scheme is implemented using optical carrier suppression and separation (OCSS) technology to generate a wavelength pair from a single laser source at the central office. This method enables the co-location of both upstream and downstream DWDM transmitters in the central office. In addition, the complexity, cost, and maintenance of the optical network unit are reduced by enabling wavelength independent operation.Second, a new multistage architecture is proposed for the delivery of information to groups of subscribers located at different distances from the central office. A 25 GHzDWDM comb is generated using OCSS technology, and error-free transmission of four 10 Gbps channels is demonstrated.Finally, a new wide area access network with bi-directional DWDM amplification using semiconductor optical amplifiers (SOAs) is demonstrated. The detrimental effect of SOAcrosstalk resulting from cross gain modulation can be suppressed using a constant intensitymodulation format such as differential phase shift keying (DPSK). The feasibiity of bi-directional DPSK transmission of 16interleaved DWDM channels using an in-line SOA has been studied experimentally. In addition, the reduction of bi-directional SOA reflections has been realized by optimizing the SOA bias current and facet reflectivities.