What is BS EN IEC 61977 about?
BS EN IEC 61977 applies to the family of fibre optic filters. These components have the following general features:
- They are passive because they contain no optoelectronic or other transducing elements that can process the optical signal launched into the input port
- They modify the spectral intensity distribution in order to select some wavelengths and inhibit others
- They are fixed, i.e., the modification of the spectral intensity distribution is fixed and cannot be tuned
- They have input and output ports or a common port (having both functions of input and output) for the transmission of optical power, the ports are optical fibre or optical fibre connectors
- They differ according to their characteristics
The characteristics of fibre optic filters can be divided into the following categories:
- Short-wave pass (only wavelengths lower than or equal to a specified value are passed)
- Long-wave pass (only wavelengths greater than or equal to a specified value are passed)
- Band-pass (only an optical window is allowed)
- Notch (only an optical window is inhibited)
- Gain flattening (compensating the spectral profile of the device)
It is also possible to have a combination of the above categories.
BS EN IEC 61977 provides generic information including the terminology of IEC 61753-04x series documents. BS EN IEC 61977 establishes uniform requirements for optical, mechanical and environmental properties.
Who is BS EN IEC 61977 for?
BS EN IEC 61977 on fibre optic filters is useful for:
- Telecommunication component manufacturers
- Design engineers
- Quality control personnel
Why should you use BS EN IEC 61977?
Fibre optic filters are fibre instruments used for wavelength selection, which can select the desired wavelengths to pass, and reject the others. At the receiving end, optical filters separate desired wavelengths from optical fibre.
The fibre optic fixed filters described in BS EN IEC 61977 are the passive components used in fibre optic transmission systems to modify the spectral intensity distribution of a signal in order to transmit or attenuate some wavelengths and block some others. BS EN IEC 61977 discusses two types of filters which are fixed optical filters whose spectral profile is fixed and optic filters whose spectral profile is changeable.
What’s changed since the last update?
BS EN IEC 61977:2020 supersedes BS EN 61977:2015. BS EN IEC 61977:2020 includes some technical changes with respect to BS EN 61977:2015. These include:
- Change of the title and the scope for the limitation to fibre optic fixed filters
- Addition of new terms and definitions reflecting the new title
- Removal of terms and definitions duplicated in IEC TS 62627-09
- Harmonization of the vertical axis of figures 1 to 5
- Restructuration of clause 4 reflecting the latest technology and market situation
