This paper introduces the development of FM simulcast, as well as the specific implementation methods and requirements of FM simulcast system for "Triple Same" and "One Guarantee". Finally, this paper takes the same frequency overlay network of JingJinTang highway as example, furthermore, details the FM simulcast system how to accomplish the testing of the same frequency, the same modulation, the same phase and cover the field strength.
Two main types of TWDM PON are distinguished by the locations of AWG and splitter. Three self-protection mechanisms i.e., dual fiber bridging pair (DFBP), single fiber bridging pair (SFBP), and single fiber bridging ring (SFBR) are designed based on bridging fiber and can be directly used on TDM part of optical distribution networks (ODN). After combined with the spectral periodicity property of AWG, the three schemes can be used in WDM part too. Each ONU can use monitoring and reporting mechanisms on optical signal to detect the fiber failure. DF then can get self-protection without any service interrupt and loss. The calculation results show the proposed schemes can keep high survivability and connection availability, while the cost, recovery time and power budget are acceptable.
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