440-2327/01 – Measurements in optical communications I (MOK I)
| Gurantor department | Department of Telecommunications | Credits | 4 |
| Subject guarantor | doc. Ing. Jan Nedoma, Ph.D. | Subject version guarantor | doc. Ing. Jan Nedoma, Ph.D. |
| Study level | undergraduate or graduate | Requirement | Choice-compulsory type A |
| Year | 3 | Semester | winter |
| | Study language | Czech |
| Year of introduction | 2021/2022 | Year of cancellation | |
| Intended for the faculties | FEI | Intended for study types | Bachelor |
Subject aims expressed by acquired skills and competences
During the semester, students will get acquainted with the principles of today's most frequently performed measurements on optical lines and with measuring instruments and devices used in laboratories and for field measurements.
Teaching methods
Lectures
Seminars
Summary
Students will learn to use measuring instruments and perform orientation and overview measurements on optical paths. They will get acquainted with the current requirements of telecommunications operators for protocol measurements on new routes. They will also get acquainted with the parameters of measuring instruments in order to be able to independently evaluate and select instruments from a wide range on the market.
Compulsory literature:
Recommended literature:
Way of continuous check of knowledge in the course of semester
Submission of measurement protocols. Two tests during theoretical exercises. Passing the written and oral exams.
E-learning
Other requirements
There are no additional requirements for the student.
Prerequisities
Subject has no prerequisities.
Co-requisities
Subject has no co-requisities.
Subject syllabus:
1. Introduction to the basic handling of measuring instruments, safety when working with LASER sources, and connecting optical fibers. Work with inspection microscope (digital), problems of dirt distribution within the connector connection, etc.
2. Basic terms and definitions, sources of optical radiation, optical power meters.
- overview of optical fiber standards according to ITU-T
- measurement of optical power in burst mode and in standard mode (difference for PON networks), what radiation sources are used (where F-P lasers, where DFB lasers, where SLED, where VCSEL)
- Influence of macro and micro bends.
3. Measurement of attenuation by the direct method (3 types - 1, 2, 3 patchcords)
- measurement according to network and cable standards, wavelength
- creation of a professional protocol.
4. Measurement of attenuation by the method of two lengths, production of connectors, production of optical fibers.
5. Noise measurement, methods based on signal-to-noise ratio (OSNR) measurement
6. Reflectometric measurements on single-mode routes - measurement of insertion and return attenuation, route profile, OTDR measurements
- measurement on the live network, measurement on fibers according to ITU-T (difference of measurement in backbone and access network)
- creation of a professional protocol
- OTDR meter: basic parts of the instrument, dead zones of measurement, course of the backscatter curve
7. Measurement of chromatic dispersion, methods of chromatic dispersion compensation
- Design of chromatic dispersion compensator (majority of implementations are fiber), limit values for backbone networks (penalties)
8. Spectral power characteristics of excitation LEDs and LD.
9. Problems of backbone networks - physical optical layers up to higher layers (MPLS, SDH). DWDM / CWDM. Problems of optical access networks - all series of xPON technologies and their mutual compatibility
10. Measurement of parameters of passive optical networks
- passive network design
- measurement by PON power meter
- basic settings of PON networks (EPON, GPON)
11. Measurement of transmission parameters of xWDM and PON networks, throughput, delay, error rate, BER
- TCP throughput (RFC 6349), Annex No. 1 of the CTU Methodology
- Bandwidth (ITU-T Y.1564), Annex No. 2 of the CTO Methodology
- delay, its fluctuations, and loss of frames (ITU-T Y.1564), Annex No. 2 of the CTO Methodology
- measurement of failures and losses of samples PRBS31 (ITU-T O.150), an alternative method of Annex No. 1 of the CTO Methodology
12. Legislation - reporting of network parameters to ESD (active and available connections), Regulation (EU) 2015/2120 and network neutrality, conditions of service provision, ban on blocking, deceleration, speed limitation, ZEK, and amendment with transposition of EC Code, BEREC documents ( instructions),
13. Reserve
Conditions for subject completion
Occurrence in study plans
Occurrence in special blocks
Assessment of instruction
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