FOTL - Tutorial 005. Fiber-optic cables. Classification

fiber, волс, ВОК

Classification of fiber optic cables

Fiber-optic cables (FOC) - a cable products, containing a number of optical fibers and the reinforcing member enclosed in a common envelope, on top of which, depending on the operating conditions of the protective cover can be imposed.

Fiber-optic cables are classified by purpose and conditions of use, as shown in the figure below.

Since FOC less durable than electric cables, they must be protected from the harmful effects of the environment and human activities, which include mechanical stress (tension, bending, compression, torsion, shock, vibration); temperature changes; water penetration.

Fiber-optic cable can consist of the following components:

  1. Outer PE shell - protects the cable from external influences;
  2. Armid thread - protects the cable from the squeezing and stretching;
  3. Inner polyethylene shell - separates the optical module from armid shell and the outer shell;
  4. Binding tapes - connect optical modules in the overall braid;
  5. Filling unit - empty unit without the optical fiber cable is designed to form a shape;
  6. Optical module - module with optical fibers. Usually there is one module 8 to the fibers;
  7. Optical fibers;
  8. Fiberglass bars - reinforcing the central element, also protects the cable from stretching. It is used often in self-supporting cables;
  9. The hydrophobic filler - filler, protects from moisture.

Basic requirements for the fiber-optic cable, and the material of its main components

Common basic requirements for physical and mechanical characteristics of the fiber optic cable are:

  1. high tensile strength;
  2. moisture resistance;
  3. sufficient buffer protection to reduce losses caused by mechanical stresses;
  4. thermal stability in the operating temperature range (–40—+50 о С);
  5. flexibility and the possibility of laying on the actual routes;
  6. radiation resistance;
  7. chemical and impact resistance;
  8. ease of installation and gaskets;
  9. reliability in operation for 20 years.

Also during the design must take into account the relative POC location strength members and optical fibers. There are two main options for such a mutual arrangement:

  • In the first reinforcing member is located in center of the cable, and fiber - concentrically relative to the central element.
  • In the second optical fibers are arranged in the center and power elements - around

Typical designs of optical fiber cables

Currently in different countries developed and produced a large number of construction POC. The most widely used group of four cable designs:

  • with a free tube;
  • free-fiber bundle;
  • with core-core;
  • belt type.

The construction of the FOC with the free fiber bundle

With this structure, the optical fiber bundles are placed freely inside the core tube. This design reduces the tensile, compressive and compressive loads on the optical fibers. Fume cables are used for the convenience of cutting the outer sheath of the optical cable.

The construction of the FOC core with core

With this structure, there is a core shaped with cavities for placing the optical fibers. The advantage of this type of construction is that the center of figure of the core is a steel strength member that receives the compressive and tensile impact.

Design ribbon fiber optic cable

In this structure, all the optical fibers are combined into bands, which are located within the core tube.

The construction of ocean-going fiber optic cable

It designs cables laid on the seabed, there are special requirements. Cables of this type are experiencing particularly heavy loads. Therefore, more than 90% of the data cable constructions make up the protective and reinforcing elements.

Fiber Optic Cables urban telephone networks

Cables used for urban telephone networks have, as a rule, lightweight design, as laid in cable ducts, pipes, reservoirs and inside buildings. Such cables are designed according to the principle of free tube with a large number of optical fibers in each module.

JSC "Samara Optical Cable Company" FOC makes the city the following brands: OKL 01 OKL 02.

NF JSC "Wiring harness" produces urban brands EQA OK M M ACS (TU 16.K12 16, 97).

"Plant Saransk Cable" in addition to long-distance FOC has mastered the production of cables and urban telephone networks of the following brands: JAG (laying in cable ducts) and CPR (laying directly in the ground).

Fiber-optic cables for internal wiring

The design of the fiber-optic cable for internal wiring consists of the following main elements:

  1. an optical fiber;
  2. buffer shell;
  3. power element;
  4. outer shell

Cables are designed for internal wiring, divided into:

  1. Simplex cables;
  2. duplex cables;
  3. multi-fiber cables;
  4. cables for heavy duty;
  5. fireproof cables.

Virtual hosting with 10 percent discount
Virtual hosting with 10 percent discount
EVILEG offers reliable hosting with a 10% discount for virtual hosting and 5% for VPS
Support the author Donate

Comments

Only authorized users can post comments.
Please, Log in or Sign up
N
June 25, 2019, 2:41 p.m.
Nico03

C++ - Test 001. The first program and data types

  • Result:40points,
  • Rating points-8
S
June 25, 2019, 9:16 a.m.
SabaNtuy

C ++ - Test 004. Pointers, Arrays and Loops

  • Result:40points,
  • Rating points-8
SZ
June 24, 2019, 5:49 p.m.
Serg Zhi

C++ - Тест 003. Условия и циклы

  • Result:78points,
  • Rating points2
Last comments
June 24, 2019, 10:23 a.m.
Евгений Легоцкой

Хорошо, ну будут проблемы помимо того, что касается статей, то не стесняйтесь задавать вопросы на форуме.
МБ
June 24, 2019, 10:21 a.m.
Михаил Булатов

Извиняюсь, все работает(из-за невнимательности).
June 24, 2019, 9:52 a.m.
Евгений Легоцкой

Придётся делать ещё сигнал в дочернем qml и пробрасывать через коннекты и обработчики. А вообще нужно смотреть конкретный код и что вы пытаетесь сделать. Так что лучше будет, если вы зад...
June 21, 2019, 8:31 a.m.
Ruslan Polupan

Вот моя строка по которой все отлично сработало %cqtdeployer% -bin c:/CentralMposKeys/CentalMposKeys.exe -qmake c:/Qt/5.12.2/mingw73_64/bin/qmake.exe
June 21, 2019, 8:24 a.m.
Андрей Янкович

Возможно кому то пригодится сqtdeployer для windows работает точно так же как и для Linux разница лишь в команде запуска Linux: cqtdeployer Windows: %cqtdeployer...
Now discuss on the forum
June 26, 2019, 6:10 p.m.
Евгений Легоцкой

Попробуйте включить все триггеры редактирования у TableView, а потом уже немного поиграться с ними, если заработает. tableView->setEditTriggers(QAbstractItemView::AllEditTriggers);
June 26, 2019, 4:22 p.m.
Михаиллл

Похоже никак и нужно использовать вебвью
June 26, 2019, 4:13 p.m.
Михаиллл

Таке попробовал сделать так, но не работает вы вырубается при загрузкею.Может быть вы знаете, как это можно исправить? //import QtWebEngine 1.9import QtWebView 1.13Item { width: 4...
June 26, 2019, 7:55 a.m.
Михаиллл

Пробовал перезапускать qmake, удалять папку билд. Не помогало. Потом перезапустил сам Qt, и помогло. Жутко глючит. Сейчас опять сталкиваюсь с подобными багами.
June 26, 2019, 7:07 a.m.
Евгений Легоцкой

Да, работает. Но это решение подходит в основном для отоюражения статической информацию, которая не меняется. А TableView или ListView позволяют работать с моделями данных и редактировать их, ...
Looking for a Job?
10,000.00 руб. - 15,000.00 руб.
Нужен помощник для создания API.
Moscow, Moscow, Russia
25,000.00 руб. - 30,000.00 руб.
Разработчик Qt/C++
Barnaul, Altai Krai, Russia

For registered users on the site there is a minimum amount of advertising

EVILEG
About
Services
Join us
© EVILEG 2015-2019
Recommend hosting TIMEWEB