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ISO 20780:2018 pdf free

ISO 20780:2018 pdf free.Space systems一Fiber optic components一Design and verification requirements
Employ an optimal overall design scheme according to the FOC function and required specifications:
一Operating principles: for the same function, the FOC could be fabricated by different operating principles. For example, for non-wavelength selective branching components (such as optical fibre couplers), fibre fused and tapered structure, fibre polished structure or optical waveguide structure are all usable;for fibre filters, etalon, FBG or thin film filter technologies are both adoptable; and for semiconductor light sources, different resonant cavities structures could be used. Hence,the operating principle shall be first determined according to the required specifications and applications.
一Packaging: determine the packaging type, external structure and fibre bending radius inside the FOC according to the application environment and dimension requirements; determine the type of connector and the interface structure of the fibre connectors, such as FC, SC, ST, etc.
一Operating conditions: determine the operating conditions of the FOC according to the application requirements (e.g:: long life-time application, severe environment application). The FOC shall not be used out of the range of their qualified characteristics.
一Raw materials and accessories: determine the key parameters of raw materials and accessories according to the operating conditions. Especially, many kinds of polymeric compounds are used in FOC, including adhesive, sealant, pouring sealant, etc. Besides the functional requirements, space environmental adaptabilities shall be considered for polymeric compounds, such as decomposition under high temperature and irradiation environments, volatilization under vacuum environment.
一TRL 6 (refer to ISO 16290) shall be preferred as a minimum for any choice of technology.
The optical parameter design of FOC includes:
一By determining the design of active light-emitting devices, determine the parameters of active light luminescent devices, such as beam mode field, divergence angle, output power, wavelength, spectral bandwidth, polarization, side-mode suppression ratio, pulse width and so on.
一By determining the design of active light-receiving devices, determine the parameters of active optical receivers, such as operating wavelength, esponsivity, sensitivity, polarization sensitivity and so on.
一Design the parameters of passive FOC, such as operating wavelength range, insertion loss, return loss, PDL, extinction ratio, isolation (e.g. for fibre optic isolators and fibre WDM), split-ratio (optical fibre coupler, fibre WDM), reflectivity (fibre reflector, fibre grating) and set up the overall optical loss for the system.
一Analyze compatibility of monitoring optical signal (wavelength, continuous or pulsed signal, power or energy delivered) with optical detector.ISO 20780 pdf download.

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