Отправить запрос
    Оптический рефлектометр QWM-8000-OTDR от компании QTECH
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    Оптический рефлектометр QWM-8000-OTDR от компании QTECH

    6 июля 2021

    Одним из основных направлений производственной деятельности компании QTECH является выпуск оборудования спектрального уплотнения. DWDM системы нашего производства позволяют значительно увеличить пропускную способность оптоволоконных IP-сетей без замены волоконно-оптических кабелей.

    Наращивание пропускной способности ВОЛС достигается благодаря применению технологии оптического мультиплексирования с разделением каналов по длине волны. Это решение дает возможность передавать по одной паре волокон до 80 каналов в окне прозрачности 1550 нм. Скорость передачи информационного трафика достигает 10 Гбит/с на каждый канал.

    Важным фактором обеспечения работоспособности DWDM-систем является непрерывная рефлектометрия оптического волокна. Согласно рекомендации ITU-T L.301, длины волн 1625 и 1650 нм определяются как наиболее приемлемые для внеполосного измерения трафика DWDM систем C-диапазона. Можно подключать рефлектометры через TFF (Thin-Film Filter) фильтр в работующую DWDM систему, при этом не внося помех на передаваемые данные.

    Оценка качества волокна с определенной периодичностью позволяет выставлять пороговые значения для эталонной рефлектограммы и, таким образом, отслеживать тенденцию деградации оптического волокна после ввода WDM-системы в эксплуатацию. Такое решение оптимально для своевременного выявления и устранения неисправностей оптических волокон.

    Компания QTECH предлагает модель оптического рефлектометра QWM-8000-OTDR, выполненную в виде карты для шасси DWDM-оборудования.

    Модуль OTDR 1625nm, динамический диапазон 40dB, SC/UPC, занимает 2 слота
    Модуль OTDR 1625nm, динамический диапазон 36dB, SC/UPC, занимает 2 слота
    При заказе возможен выбор динамического диапазона оптического рефлектометра: от 20 до 40dB. Что позволяет тестировать ВОЛС длиной 200 км и более.

    Рассмотрим конкретный пример применения рефлектометра. Ниже приведена схема одной из реально созданных систем плотного спектрального уплотнения.

    Схема применения рефлектометра QWM-8000-OTDR

    Рефлектометр OTDR работает на длине волны 1625 нм. Подключение измерительного устройства осуществляется через специальный порт EDFA усилителя (разделительный фильтр TFF находится в составе карты EDFA-усилителя). Высокое качество TFF-фильтра способствует надежной фильтрации сигнала измерения от пользовательских сервисов C- диапазона.

    Возможно размещение рефлектометра как на стороне передачи, так и на стороне приема. Второй вариант лучше подходит для протяженных линий (свыше 150 км), поскольку позволяет минимизировать вредное влияние от вынужденного Рамановского рассеяния (SRS).

    Суть этого явления: сигнал C-диапазона с длиной волны 1550 нм распространяется вдоль волокна. Сигнал обратного рассеяния попадает на частоты рефлектометра OTDR 1625/1650 нм и проходит через фильтр TFF тестового OTDR-порта практически без потерь. Несмотря на то, что уровень мощности рамановского рассеяния довольно мал, оно может значительно уменьшить динамический диапазон рефлектометра из-за его высокой чувствительности.

    Программное обеспечение карты OTDR-рефлектометра позволяет привязать рефлектограмму к схеме трассы прокладки оптоволоконного кабеля и параметрам ВОЛС. Таким образом достигается точное определение места повреждения оптического волокна.

    Измерение производится пачками импульсов с усреднением результирующей рефлектограммы. Таким образом минимизируются шумовые составляющие. Задавая периодичность импульсных пачек, можно задать интервал между измерениями.

    Также можно задать величину отклонения текущей рефлектограммы от исходной для срабатывания сигнализации на превышение заданного порога, оповещающей оператора о деградации/повреждении оптического волокна.

    Вывод: комплектация DWDM-оборудования картой оптического рефлектометра предоставляет большие возможности по мониторингу и выявлению неисправности оптических волокон с их точной локализацией.


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