DD IEC PAS 61300-3-29:2002 pdf download Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 3-29: Examinations and measurements — Measurement techniques for characterizing the amplitude of the spectral transfer function of DWDM components
Scope
The purpose of this document is to identify two basic measurement methods forcharacterising the spectral transfer functions of DWDM filter components as defined in IEC62074-1. The transfer functions can be used to produce measurements of attenuation (A)polarisation dependent loss (PDL), isolation, centre wavelength, and bandwidth (BW).
Normative references
The following normative documents contain provisions which, through reference in this textconstitute provisions of this part of IEC 61300. All normative documents are subject torevision and parties to agreements based on this part of IEC 61300 are recommended toapply the most recent edition. A catalogue of current IEC and ISO standards can be found onhttp://www.iec.ch/ and http://wwwiso.ch/ respectively.
IEC 62074-1: Fibre Optic WDM devices – Part 1 Generic specification
EC 61300-3-2: Fibre optic interconnecting devices and passive components – Polarisationdependence of attenuation for single mode fibre optic devices
EC 61300-3-5: Fibre optic interconnecting devices and passive components – Wavelengthdependence ofattenuation
IEC 61300-3-7: Fibre optic interconnecting devices and passive components – Wavelengthdependence ofattenuation and return loss
EC 61300-3-12: Fibre optic interconnecting devices and passive components – Polarisationof a single-mode fibre optic component: Matrix calculation method
General description
This document is complementary to the wavelength dependence of attenuation (IEC61300-3-5), the wavelength dependence of attenuation and return loss (IEC 61300-3-7)polarisation dependence of attenuation (lEC 61300-3-2), and the polarisation dependence otattenuation using matrix methods (lEC 61300-3-12) test procedures. lt is meant to cover anyDWDM devices described by lEC 62074-1. In general, these DWDM devices have channebandwidths less than 1 nm, filter response slopes greater than 100 dB/nm, and out-of-bandrejection extending over tens of nm.
The methods described in this procedure will show how to obtain the transfer function from asingle input to a single output port (single conducting path). For an m x n device, it will berequired to repeat this procedure using all possible combinations of input and output ports.
The methods described in this procedure are intended to be applicable to any wavelengthband (C, L, S, O, etc.) although examples may be shown in the C-band for illustrativepurposes
The two methods contained in this procedure differ mainly in the way in which the wavelengthresolution is obtained. Method A uses a tuneable laser source and a broad band detectorwhile Method B uses a broad band source and a tuneable receiver, Method A shall beconsidered the reference test method for DWDM devices.This procedure also includesappendixes that illustrate the following:
Reflection spectrum measurements
B.Determination of wavelength increment parameter
Determination of a mean value using the shorth function
Precautions in using IEC 61300-3-7 for DWDM devices0
3.1Terms and abbreviations
Many of the terms and abbreviations in this document are described in the IEC genericstandard 60050-731 and the lEC WDM component standard 62074-1Some terms andabbreviations specific to this measurement technique are included below.
Amplified spontaneous emissions
Bandwidth: The spectral width of a signal or filter. in case of a laser signasuch as a tuneable laser source, the term linewidth is commonly preferredOften defined by the width at a set power distance from the peak power level ofthe device (i.e. 3 dB BW or 1 dB BW). Must be defined as the distancebetween the closest crossings on either side of the centre wavelength in thecases where the spectral shape has more than 2 such points. The distancebetween the outermost crossings can be considered the full spectral width.
Wavelength sampling increment during the measurement
Centre channel or nominal operating wavelength for a component
Operating wavelength range. The specified range of wavelengths from Ahmin toAhmax centred about the nominal operating wavelength, within which a WDMdevice operates
Source spontaneous emission: Broad band emissions from a laser cavity thatbear no phase relation to the cavity field. These emissions can be seen as thebaseline noise on an optical spectrum analyzer.
DD IEC PAS 61300-3-29:2002 pdf download
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