16 January 2006 Improved passive optical network architectures to support local area network emulation and protection
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We describe two optical layer schemes which simultaneously facilitate local area network emulation and automatic protection switching against distribution fiber breaks in passive optical networks. One scheme employs a narrowband fiber Bragg grating placed close to the star coupler in the feeder fiber of the passive optical network, while the other uses an additional short length distribution fiber from the star coupler to each customer for the redirection of the customer traffic. Both schemes use RF subcarrier multiplexed transmission for intercommunication between customers in conjunction with upstream access to the central office at baseband. Failure detection and automatic protection switching are performed independently by each optical network unit that is located at the customer premises in a distributed manner. The restoration of traffic transported between the central office and an optical network unit in the event of the distribution fiber break is performed by interconnecting adjacent optical network units and carrying out signal transmissions via an independent but interconnected optical network unit. Such a protection mechanism enables multiple adjacent optical network units to be simultaneously protected by a single optical network unit utilizing its maximum available bandwidth. We experimentally verify the feasibility of both schemes with 1.25 Gb/s upstream baseband transmission to the central office and 155 Mb/s local area network data transmission on a RF subcarrier frequency. The experimental results obtained from both schemes are compared, and the power budgets are calculated to analyze the scalability of each scheme.
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Elaine Wong, Elaine Wong, Nishaanthan Nadarajah, Nishaanthan Nadarajah, Chang-Joon Chae, Chang-Joon Chae, Ampalavanapillai Nirmalathas, Ampalavanapillai Nirmalathas, Sanjeewa Manik Attygalle, Sanjeewa Manik Attygalle, "Improved passive optical network architectures to support local area network emulation and protection", Proc. SPIE 6038, Photonics: Design, Technology, and Packaging II, 60380W (16 January 2006); doi: 10.1117/12.651718; https://doi.org/10.1117/12.651718


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