AATCC 6-1998 Optical fibre amplifiers — Basic specification — Part 6-1: Test methods for pump leakage parameters — Optical demultiplexer.
This part of IEC 61290 applies to optical fibre amplifiers (OFAs) using active fibres, containing rare-earth dopants, presently commercially available. The object of this standard is to establish uniform requirements for accurate and reliable measurements, by means of the optical demultiplexer test method, of the following OFA parameters, as defined in clause 3 of IEC 61291-1: a) pump leakage to output; b) pump leakage to input. NOTE All numerical values followed by (‡) are currently under consideration.
2 Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of this part of IEC 61290. At the time of publication, the edition indicated was valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC 61290 are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 61291-1, — Optical fibre amplifiers — Part 1: Generic specification 1) .
3 Apparatus A scheme of the measurement setup is given in Figure 1. The test equipment listed below, with the required characteristics, is needed: a) optical source: The optical source shall emit a light at the signal wavelength and, for optical demultiplexer calibration, at the pump wavelength. A wavelength-tunable optical source covering both wavelength ranges, or two optical sources at fixed wavelength shall be used: — fixed-wavelength optical source: This optical source shall generate a light with a wavelength and optical power specified in the relevant detail specification. Unless otherwise specified, the optical source shall emit a continuous wave with the full width at half maximum of the spectrum narrower than 1 nm (‡). A distributed feedback (DFB) laser, a distributed Bragg reflector (DBR) laser, an external cavity laser diode (ECL), and a light-emitting diode (LED) with a narrow-band filter are applicable, for example; — wavelength-tunable optical source: This optical source shall be able to generate a wavelength-tunable light within the range specified in the relevant detail specification. Its optical power shall be specified in the relevant detail specification. Unless otherwise specified, the optical source shall emit a continuous wave with the full width at half maximum 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 (‡); NOTE The use of an LED should be limited to small-signal measurements.
b) optical isolator: The polarization-dependent loss variation of the isolator shall be better than 0,2 dB (‡). Optical isolation shall be better than 40 dB (‡). The reflectance from this device shall be smaller than – 40 dB (‡) at each port; c) variable optical attenuator: It shall be insensitive to polarization, and its attenuation range and stability shall be over 40 dB (‡) and better than ± 0,1 dB (‡), respectively. The reflectance from this device shall be smaller than – 40 dB (‡) at each port; d) optical demultiplexer: The polarization dependence of the optical demultiplexer transmissivity shall be less than ± 0,1 dB (‡). This device shall have the following characteristics: — the port A shall have a passband at the pump and the signal wavelength ranges, it shall be internally connected to ports B and C;AATCC 6 pdf download.