Refining the calculation of the sensitivity threshold of the photo­simple device of a digital fiber­optical link of the signal with spectral separation of the signal

DOI: 10.31673/2412-9070.2019.064751

Abstract

As traffic increases for telecommunications operators, the issue of upgrading existing urban transport networks becomes more pressing. One way to address this is to increase network bandwidth. Fiber optic bandwidth can be increased in two main ways: by increasing the STM signal or by introducing dense wave multiplexing technology. One of the most urgent solutions to increasing the bandwidth of a fiber optic link, especially in lines with spectral signal separation, is to take into account the properties of the components of their component equipment. Due to the fact that spectral channel separation systems use equipment that is not physically perfect and has certain tolerances, spurious cross-talk between multiplexed channels occurs. This is especially important when, as one component of the system, it is planned to use equipment that is theoretically capable of increasing bandwidth, but at the same time there are doubts as to the possible negative impact on the properties and deterioration of the overall transmission quality characteristics of the system. Existing methods and techniques propose to take into account the discrepancies in the parameters of optical components in systems with frequency optical separation of channels by means of so-called optical fines in the energy budget of the optical path, and also propose an approach to calculating the quality characteristics of a system containing decomposition elements where possible, and recomposition elements for designing systems from a set of optical components with constant or variable parameters. This article analyzes the order of calculation of the sensitivity threshold of fiber-optic lines due to spectral signal separation. The expediency of taking into account in the calculations for such lines of interaction of a pair of «photodetector-optical amplifier» is shown in order to establish the threshold of sensitivity of their composition as a separate linear element of the system. Refined calculations of the photo sensitivity threshold of the receiving device, one of the most appropriate variant of the optical amplifier and p-n-p photodiode is proposed.

Keywords: fiber-optic communication lines; sensitivity threshold; photoreceiving device; photodiode.

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