Low-noise bidirectional optical amplifier
OwnerPeter Krummrichinventor
Life of this patent
Estimating the term…
Abstract
A low-noise bidirectional optical amplifier is arranged so that the bidirectional transmission fiber is divided into two unidirectional branches by two circulators. Each of the branches is equipped with at least two amplifiers with at least one optical filter element disposed therebetween. Preferably, the first amplifier of each unidirectional branch is an active fiber which is pumped through a wavelength-division multiplex coupler that is arranged to follow the active fiber.
Claims20
A bidirectional optical amplifier for an optical wavelength-division multiplex transmission system comprising a bidirectional line section, two circulators for dividing the bidirectional line section into two unidirectional branches, each unidirectional branch having a first optical amplifier and a second optical amplifier with an optical filter being arranged between the first optical amplifier and the second optical amplifier.
Dependencies are inferred from the claim text.