BS EN IEC 61290-1-3:2021 pdf free.Optical amplifiers – Test methods Part 1-3: Power and gain parameters – Optical power meter method.
The test equipment listed below, with the required characteristics, is needed.
a) Optical source: The optical source shall be either at fixed wavelength or wavelengthtuneable.
— Fixed-wavelength optical source: This optical source shall generate a light with a wavelength and optical power specified in the relevant product specification. Unless otherwise specified, the optical source shall emit a continuous wave with FWHM of the spectrum narrower than I nm (). A distributed feedback (DFB) laser, a distributed Bragg reflector (DBR) laser, an external cavity laser (ECL) diode, a light emitting diode (LED) with a narrow-band filter and a single line laser are applicable, for example.
The suppression ratio for the side modes for the DFB laser, the DBR laser or the ECL shall be higher than 30 dB (t). The output power fluctuation shall be less than 0,05 dB (), which can be more easily attainable with an optical isolator at the output port of the optical source. Spectral broadening at the foot of the lasing spectrum shall be minimal for laser sources, and the ratio of the source power to total spontaneous emission power of the laser shall be more than 30 dB.
— Wavelength-tuneable optical source: This optical source shall be able to generate a wavelength-tuneable light within the range specified in the relevant product specification. Its optical power shall be specified in the relevant product specification. Unless otherwise specified, the optical source shall emit a continuous wave with the full width at half maximum (FWHM) of the spectrum narrower than 1 nm (). An ECL or an LED with a narrow bandpass optical filter is applicable, for example. The suppression ratio of side modes for the ECL shall be higher than 30 dB (1:). The output power fluctuation shall be less than 0,05 dB, which can be more easily attainable with an optical isolator at the output port of the optical source. Spectral broadening at the foot of the lasing spectrum shall be minimal for laser sources, and the ratio of the source power to total spontaneous emission power of the laser shall be more than 30 dB.
b) Optical power meter: It shall have a measurement uncertainty of less than 0,2 dB, irrespective of the state of polarization, within the operational wavelength bandwidth of the OA. A maximum optical input power shall be large enough [e.g. +20 dBm (t)J. Sensitivity shall be high enough [e.g. —40 dBm (t)J. A dynamic range exceeding the measured gain is required (e.g. 40 dB).
C) Optical isolator: Optical isolators may be used to bracket the OA. The polarization dependent loss (PDL) of the isolator shall be less than 0,2 dB (). Optical isolation shall be more than 40 dB (). The reflectance from this device shall be smaller than —40 dB (1) at each port.
d) Variable optical attenuator: The attenuation range and stability shall be over 40 dB () and less than 0,2 dB (), respectively. The reflectance from this device shall be smaller than —40 dB () at each port.
e) Polarization controller: This device shall be able to provide as input signal light all possible states of polarization (e.g. linear, elliptical and circular). For example, the polarization controller may consist of a linear polarizer followed by an all-fibre-type polarization controller, or by a linear polarizer followed by a quarter-wave plate rotatable by minimum of 90 and a half wave plate rotatable by minimum of 180°. The loss variation of the polarization controller shall be less than 0,2 dB (4). The reflectance from this device shall be smaller than —40 dB () at each port. The use of a polarization controller is considered optional, except for the measurement of polarization dependent gain, but can be necessary to achieve the desired accuracy for OA devices exhibiting significant polarization dependent gain.BS EN IEC 61290-1-3 pdf download.