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US 6,724,955 B2Granted
Add-drop multiplexer with signal amplification ability
AssigneesYutaka Sasaki, Toyokuni Electric Cable Co., Ltd.
InventorsYutaka Sasaki, Hirohisa Yokota, Yoshitaka Satoda
Life of this patent
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Abstract
Grating built-in type optical fiber couplers and optical amplifiers form a multiplexer for efficiently effecting multiplex separation of a specific wavelength without using an optical circulator. A function to add a signal of specific wavelength efficiently can be realized. Additionally, the device is inexpensive.
Claims8
An add-drop multiplexer with signal amplification ability comprising:
- a first optical coupler, of a grating built-in type, having an input port, a through port, a forward coupled port, and a reverse coupled port;
- a first optical amplifier having an input port for receiving a signal and an output port connected to the input port of the first optical coupler;
- a second optical coupler, of a grating built-in type, having an input port, a through port not connected to the through port of the first optical coupler, a forward coupled port connected to the forward coupled port of the first optical coupler, and a reverse coupled port connected to the reverse coupled port of the first optical coupler;
- and
- a second optical amplifier having an output, and an input connected to the input port of the second optical coupler wherein a Bragg wavelength, output by the reverse coupled port of the first optical coupler and input to the reverse coupled port of the second optical coupler, is outputted by the input port of the second optical coupler and amplified and outputted by the second optical amplifier.
2 more elements
Dependencies are inferred from the claim text.