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IEC 61291-1 pdf free download

IEC 61291-1 pdf free download.Optical amplifiers – Part 1: Generic specification.
The list of parameter definitions of OAs, given in 3.2, is divided into two parts: the first part, 3.2.1, lists those parameters relevant for OA devices, namely power, pre-, line- and distributed amplifiers: the second part, 3.2.2, lists the parameters relevant for optically amplified, elementary assemblies, namely the optically amplified transmitter (OAT) and the optically amplified receiver (OAR).
In any case where the value of a parameter is given for a particular device, it will be necessary to specify certain appropriate operating conditions such as temperature, bias current, pump optical power. In Clause 3, two different operating conditions are referred to:
nominal operating conditions, which are those suggested by the manufacturer for normal use of the CA, and limit operating conditions, in which all the parameters adjustable by the user (e.g. temperature, gain, pump laser injection current) are at their maximum values, according to the absolute maximum ratings stated by the manufacturer.
The CA shall be considered as a “black box”, as shown in Figure 1. The CA device shall have two optical ports, namely an input and an output port (Figure 1 a)). The OAT and OAR shall be considered as an CA integrated on the transmitter side or on the receiver side, respectively. Both kinds of integration imply that the connection between the transmitter or the receiver and the OA is proprietary and not to be specified. Consequently, only the optical output port can be defined for the OAT (after the OA, as shown In Figure 1 b)1 and only the optical input port can be defined for the CAR [before the CA, as shown in Figure 1 c)]. The optical ports may consist of unterminated fibres or optical connectors. Electrical connections for power supply (not shown in Figure 1) are also necessary. Following this “black box” approach, the typical loss of one connection and the corresponding uncertainty will be included within the values of gain, noise figure and other parameters of the CA device.
NOTE 1 For distributed amplifiers, as described in Clause 4. this black-box configuration can be simulated for test purposes, for example by attaching a reference fibre to test a Raman pump unit.
At the input reference plane, m input signals at the m wavelengths are considered, each with a unique power level, P11. P12. P,,, respectively. At the output reference plane, m output signals at the m wavelengths, resulting from the optical amplification of the corresponding m input signals, are considered, each with power level P01. P02. . .. P01w, respectively. Moreover, the amplified spontaneous emission, ASE, with a noise power spectral density, AsE’ is also to be considered at the CA output port.
Most definitions of relevant single-channel parameters can be suitably extended to multichannel applications. When this extension is straightforward, the word “channel” will be added to the pertinent parameter. In particular, the noise figure and the signal-spontaneous noise figure may be extended to multichannel applications, channel by channel, by considering the value of AsE) at each channel wavelength and the channel signal bandwidth. For each channel wavelength there will be a unique value of noise figure that will be a function of the input power level of all signals. In this case the parameters, channel noise figure and channel signal-spontaneous noise figure, are introduced. However, some additional parameters also need to be defined. For each parameter, the particular multichannel configuration, including the full set of channel signal wavelengths and input powers, needs to be specified.
The parameters defined in 3.2.1 will in general depend on temperature and polarization state of input channels. The temperature and state of polarization should be kept constant or controlled or be measured and reported together with the measured parameter.
NOTE 2 Except where noted, the optical powers mentioned in 3.2.1 are intended as average powers
NOTE 3 The measured optical powers are open beam powers this can result in differences of about 0,18 dB in the measurement of absolute power levels.
NOTE 4 In the case of the distributed amplifier, all the parameters are related to a suitable reference fibre used to emulate the transmission fibre in conjunction with the pumping assembly.IEC 61291-1 pdf download.

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