1 Scope and object
This part of IEC 61292, which is a technical report, applies to all commercially available optical amplifiers
(OAs), including optical fibre amplifiers (OFAs) using active fibres, as well as Raman
amplifiers. Semiconductor optical amplifiers (SOAs) using semiconductor gain media
are also included.
This technical report provides a simple informative guideline on the threshold of
high optical power that causes high-temperature damage of fibre. Also discussed is
optical safety for manufacturers and users of optical amplifiers by reiterating substantial
parts of existing standards and agreements on eye and skin safety.
To identify the maximum permissible optical power in the optical amplifier from damage-free
and safety viewpoints, this technical report identifies the following values:
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– the optical power limit that causes thermal damage to the fibre, such as fibre fuse
and fibre-coat burning;
-
– the maximum permissible exposure (MPE) to which the eyes/skin can be exposed without
consequential injury;
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– the optical power limit in the fibre that causes MPE on the eyes/skin after free-space
propagation from the fibre;
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– the absolute allowable damage-free and safe level of optical power of the optical
amplifier by comparing (a) and (c).
The objective of this technical report is to minimize potential confusion and misunderstanding
in the industry that might cause unnecessary alarm and hinder the progress and acceptance
of advancing optical amplifier technologies and markets.
It is important to point out that the reader should always refer to the latest international
standards and agreements because the technologies concerned are rapidly evolving.
In fact, the concept of hazard level and labelling is still evolving: more rigorous
labelling requirements are under discussion in IEC Technical Committee 76 as of October
2008.
The present technical report will be frequently reviewed and will be updated by incorporating
the results of various studies related to OAs and OA-supported optical systems in
a timely manner.