IEC 62802:2017 pdf download

IEC 62802:2017 pdf download.Measurement methods of a half-wavelength voltage and a chirp parameter for Mach-Zehnder optical modulators in high-frequency radio on fibre (RoF) systems
1 Scope
This document specifies measurement methods of a half-wavelength voltage and a chirp parameter applicable to MZMs in microwave and millimeter-wave RoF systems. In addition, these methods are also effective for the estimation of the intermodulation distortions and transmission performances. The methods apply for the following: – frequency range: 5 GHz to 1 1 0 GHz; – wavelength band: 0,8 µm to 2,0 µm; – electro-optic material based MZMs and their modules.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 62007-1 , Semiconductor optoelectronic devices for fibre optic system applications – Part 1: Specification template for essential ratings and characteristics IEC 62007-2, Semiconductor optoelectronic devices for fibre optic system applications – Part 2: Measurement methods
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 62007-1 :201 5 and IEC 62007-2:2009 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp 3.1 .1 half-wavelength voltage V π voltage required for a Pockels effect material based Mach-Zehnder optical modulator to induce a phase shift of half a wavelength between the lightwaves of two arms of the Mach-Zehnder interferometer SEE: Figure 1 . Note 1 to entry: It corresponds to an ON/OFF voltage of the Mach-Zehnder optical modulator. Note 2 to entry: IEC PAS 62593 defines a measurement method for a half-wavelength voltage suitable for lower frequency applications, especially less than 5 GHz.
4.2 Requirements for MZMs
4.2.1 General This method is based on the theoretical transfer curve of electro-optic material based Mach-Zehnder interferometer, where the phase shift of traveling light on each arm of the interferometer should be proportional to applied voltage, and the power of traveling lightwaves in each arm are almost the same. Requirements for the modulator of this measurement method are as follows. 4.2.2 Substrate material The main substrate materials of the modulator should be materials such as LiNbO 3 , LiTaO 3 , KH 2 PO 4 , PZT, PLZT, InP, GaAs, InGaAs, InAlAs, InGaAsP, nonlinear optical chromophore containing polymer, FTC type chromophore containing polymer, etc., which realise the electro-optic effect (Pockels effect). If strictly considered, semiconductor materials do not possess a pure electro optic effect, however, the semiconductor Mach-Zehnder modulators can be adjudged as electro-optic material-based Mach-Zehnder modulators. 4.2.3 Optical waveguide design The optical waveguide should be designed as a single Mach-Zehnder interferometer type comprised of two Y-junctions or symmetric directional couplers and parallel waveguides. Reflection-type Mach-Zehnder optical modulators are modified designs of the modulators.
5 Sampling for quality control
5.1 Sampling A statistically significant sampling plan shall be agreed upon by user and supplier. Sampled devices shall be randomly selected and representatives of production population, and shall satisfy the quality assurance criteria using the proposed test methods. 5.2 Sampling frequency Appropriate statistical methods shall be applied to determine adequate sample size and acceptance criteria for the considered lot size. In the absence of more detailed statistical analysis, the following sampling plan can be employed: Half-wavelength voltage: two units at least per manufacturing lot.