IEVref: 731-03-84 ID: Language: en Status: Standard Term: acceptance angle Synonym1: Synonym2: Synonym3: Symbol: Definition: half the vertex angle of that cone within which optical power may be coupled into bound modes of an optical fibre NOTE 1 – Acceptance angle is a function of position on the entrance face of the core when the refractive index is a function of radius in the core. In that case, it is: $\text{arcsin}{\left[{n}^{2}\left(r\right)-{n}_{2}^{2}\right]}^{1/2}$ where n (r) is the refractive index and n2 is the minimum refractive index of the cladding. NOTE 2 – Power may be coupled into leaky modes at angles exceeding the acceptance angle. Publication date: 1991-10 Source: Replaces: Internal notes: 2017-06-02: Cleanup - Remove Attached Image 731-03-84.gif CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: