Abstract
A novel design of optical wavelength switch, based on an asymmetric switching architecture for edge node implementation, is presented in this paper. Compared to previous research for optical core transport network applications, the proposed work has a unique aspect to build dynamic multicasting and spectral equalization, vital functionalities for optical wavelength switch in the edge of optical access networks. An optical wavelength switch was experimentally implemented and evaluated in a 4 × 16 switching architecture to demonstrate the concept. This dynamic multicasting and spectral equalization were achieved by utilizing liquid crystal on a silicon spatial light modulator (LCoS-SLM) device. An optimal design of computer-generated holograms (CGHs) through an improved GS algorithm was used to perform the beam steering and wavelength switching. A variety of wavelength switching scenarios has been experimentally evaluated. The measurement results showed an average insertion loss of around -12.5 dB, and the calculated crosstalks were all less than -28 dB. Its applications in digital data transmissions were evaluated to achieve a transmission speed larger than 2.5 Gbps. The eye diagram measurement results showed that most wavelength switching scenarios have nearly bit-error-free transmission. The scenario includes the multicasting with spectral equalization within the proposed asymmetrical switching architecture.
Highlights
F AST deployment of wavelength division multiplexing (WDM) and dense WDM (DWDM) technologies in optical fiber transmission networks [1]–[4] have faced many severe challenges to implementing new reconfigurable edge node architectures for fiber network access
The light loss in the proposed optical wavelength switch system mostly resulted from the insertion losses of each used optical element, the diffractive grating component’s efficiency in combination with the Liquid Crystal on Silicon (LCoS)-spatial light modulator (SLM) device, and the fiber coupling loss
The LCoS-SLM device’s efficiency was obtained based on the calculation as the +1st diffraction order power relative to the 0th diffraction order power when no computer-generated holograms (CGHs) patterns were uploaded to the LCoS-SLM device
Summary
F AST deployment of wavelength division multiplexing (WDM) and dense WDM (DWDM) technologies in optical fiber transmission networks [1]–[4] have faced many severe challenges to implementing new reconfigurable edge node architectures for fiber network access. For the implementation of an edge node between the optical core transport network and the optical fiber access network, an optical wavelength switch based on asymmetrical switching architecture would help distribute the high-speed data rate to many clients. A reconfigurable optical wavelength switch utilizing the LCoS-SLM device in an asymmetric wavelength switching architecture, as illustrated, is presented It is the first time for edge node (i.e., e-ROADM) implementation to the best of our knowledge. Ports simultaneously) and spectral equalization, which are the vital functionalities required for the optical transport network to interface with the optical fiber access network, were implemented through the design of computer-generated-holograms (CGHs) The design of these CGHs was based on an optimal procedure of the Gerchberg-Saxton (GS) algorithm [18], [19]. The proposed optical wavelength switch system will offer a direct approach to efficiently implementing a reliable edge node architecture for an optical fiber access network
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