Новый лазер

Данная статья посвяшена описанию нового лазера, который при моем участии был создан в фирме AT&T Bell Laboratories. Мы назвали его «рассеченный лазер со связанными резонаторами» (cleaved — coupled — cavity laser), или, по первым буквам английского названия, «С3-лазер». В сущности это всего лишь два обычных полупроводниковых лазера, близко расположенных на одной прямой, которые могут взаимодействовать оптически, но электрически независимы. Расположением лазеров на одной прямой достигается возможность получить на выходе электромагнитное излучение в виде пучка света одной длины волны. К тому же такой лазер становится перестраиваемым и его можно быстро переключать с одной длины волны на другую. Применение С -лазеров может сыграть большую роль в дальнейшем развитии систем оптической связи и позволит существенно увеличить скорость передачи информации. Кроме того, возможность перестройки лазера расширит сферу его применения за пределы систем оптической связи. Например, его можно будет использовать в качестве оптоэлектронного логиче

 Конфигурация, соответствующая С3- лазеру и представляющая собой пару лазерных диодов с сильной оптической связью, полученных разделением одной диодной заготовки путем скалывания на два резонатора типа Фабри—Перо, впервые была получена и исследована в Физическом институте им. П.Н. Лебедева АН СССР в 1965 г. (см. Елисеев П.Г. и др. Эффекты взаимодействия двух лазерных диодов. — Письма в ЖЭТФ. 1965, т. 2. вып. 2. с. 58-59) Материалом для рассматриваемого в статье С3- лазера служит четверная система нндий- галлий-фосфор-мышьяк, также впервые реализованная в лазерной гетероструктуре в этом же институте, (см. Богатов А.П. и др. Г етеролазеры на основе AlGaAsSb и GalnAsP. — Квантовая электроника, 1974. т. 1, вып. 10, с. 2286-2287) — Прим. ред.

ского элемента систем обработки информации, работающих со скоростью несколько гигабит (109 бит) в секунду.

Поскольку главные элементы оптического канала связи — лазер, или генератор сигналов, и волоконный световод, или передающая среда, — тесно связаны, то, прежде чем перейти к оценке достоинств С3-лазера, рассмотрим вначале, как работает оптическое волокно.

 

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