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AssigneeFujitsu Limited
InventorSusumu Kinoshita
Estimating the term…
The present invention relates to a wavelength-multiplexed light amplifying apparatus to be used in a state of being connected to a branching portion of a multiplexing/branching unit or to be used for a m×n matrix optical switch of an optical cross-connect. The wavelength-multiplexed light amplifying apparatus is composed of a plurality of wavelength-multiplexed light amplifying units and an optical feedback loop system. A signal input port of an optical branching section in one wavelength-multiplexed light amplifying unit is connected to an output side of an optical amplifying section in the preceding wavelength-multiplexed light amplifying unit. This configuration disperses the power loss of an optical signal to perform amplification with high efficiency and further enables the expansion of the branching port in the in-service. Additionally, it can eliminate the need for the installation of an optical isolator or reduce the required value of isolation to stabilize the system, or can accomplish the control to maintain the gains of all ports constant.
An optical amplifier, comprising:
An optical amplifier, comprising:
A wavelength-multiplexed light amplifying apparatus, comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
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Signal power control: in a multiwavelength system, e.g. gain equalisation
Arrangements therefor: broadcast and select arrangements, e.g. with an optical splitter at the input before adding or dropping
Arrangements therefor: select and combine arrangements, e.g. with an optical combiner at the output after adding or dropping
Arrangements therefor: multi-stage arrangements, e.g. by cascading multiplexers or demultiplexers
Term end not estimated
1. Field of the Invention
The present invention relates to a wavelength-multiplexed light amplifying apparatus, an optical amplifier, and further to an optical add-and-drop apparatus (optical ADM:Optical Add-Drop Multiplexer) using a wavelength-multiplexed light amplifying basic unit.
2. Description of the Related Art
FIG. 1 is an illustration of a wavelength-multiplexed light amplifying apparatus according to a first embodiment of the present invention;
FIG. 2 is a block diagram illustrating an aspect of the present invention;
FIG. 3 is a block diagram showing a configuration of a wavelength-multiplexed light amplifying unit in the first embodiment of this invention;
Embodiments of the present invention will be described hereinbelow with reference to the drawings.
(A) Description of a First Embodiment of the Invention
FIG. 1 shows a wavelength-multiplexed light amplifying apparatus according to a first embodiment of this invention. A wavelength-multiplexed light amplifying apparatus, designated generally at numeral 25 in FIG. 1, is for distributing one optical signal to 32 users, and employs optical feedback control. Besides, in the wavelength-multiplexed light amplifying apparatus 25 shown in FIG. 1, of the 32 users, 16 users are put in the illustration, and this system is mainly for use in a system shown in FIG. 2.