BS EN 61280-2-2:2012:2015 Edition
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Fibre optic communication subsystem test procedures – Digital systems. Optical eye pattern, waveform and extinction ratio measurement
| Published By | Publication Date | Number of Pages |
| BSI | 2015 | 32 |
This standard specifies a gauging system for metric taper external threads and mating parallel internal threads as specified in DIN 158-1.
Gauging of parallel internal threads is to be carried out as specified in ISO 1502.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 6 | CONTENTS |
| 8 | 1 Scope 2 Normative references 3 Terms and definitions |
| 9 | 4 Apparatus 4.1 General |
| 10 | 4.2 Reference receiver definition 4.3 Time-domain optical detection system 4.3.1 Overview Figure 1 – Optical eye pattern, waveform and extinction ratio measurement configuration |
| 11 | 4.3.2 Optical-to-electrical (O/E) converter 4.3.3 Linear-phase low-pass filter |
| 12 | 4.3.4 Oscilloscope Figure 2 – Oscilloscope bandwidths commonly used in eye pattern measurements |
| 13 | 4.4 Overall system response 4.5 Oscilloscope synchronization system 4.5.1 General Table 1 – Frequency response characteristics |
| 14 | 4.5.2 Triggering with a clean clock 4.5.3 Triggering using a recovered clock |
| 15 | 4.5.4 Triggering directly on data Figure 3 – PLL jitter transfer function and resulting observed jitter transfer function |
| 16 | 4.6 Pattern generator 4.7 Optical power meter 4.8 Optical attenuator 4.9 Test cord 5 Signal under test 6 Instrument set-up and device under test set-up |
| 17 | 7 Measurement procedures 7.1 Overview 7.2 Extinction ratio measurement 7.2.1 Configure the test equipment 7.2.2 Measurement procedure |
| 18 | 7.2.3 Extinction ratio calculation Figure 4 – Histograms centred in the central 20 % of the eye used to determine the mean logic one and 0 levels, b1 and b0 |
| 19 | 7.3 Eye amplitude 7.4 Optical modulation amplitude (OMA) measurement using the square wave method 7.4.1 General 7.4.2 Oscilloscope triggering 7.4.3 Amplitude histogram, step 1 |
| 20 | 7.4.4 Amplitude histogram, step 2 7.4.5 Calculate OMA 7.5 Contrast ratio (for RZ signals) 7.6 Jitter measurements Figure 5 – OMA measurement using the square wave method |
| 21 | 7.7 Eye width 7.8 Duty cycle distortion (DCD) |
| 22 | 7.9 Crossing percentage Figure 6 – Construction of the duty cycle distortion measurement |
| 23 | 7.10 Eye height 7.11 Q-factor/signal-to-noise ratio (SNR) 7.12 Rise time Figure 7 – Construction of the crossing percentage measurement |
| 24 | 7.13 Fall time Figure 8 – Construction of the risetime measurement with no reference receiver filtering |
| 25 | 8 Eye-diagram analysis using a mask 8.1 Eye mask testing using the ‘no hits’ technique Figure 9 – Illustrations of several RZ eye-diagram parameters |
| 26 | 8.2 Eye mask testing using the ‘hit-ratio’ technique Figure 10 – Basic eye mask and coordinate system |
| 28 | 9 Test result 9.1 Required information 9.2 Available information 9.3 Specification information Figure 11 – Mask margins at different sample population sizes |
| 29 | Bibliography |
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