High isolation, optical add-drop multiplexer
First Claim
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1. Optical add-drop multiplexer having:
- a first band-pass, multidielectric filter (F1) for receiving a first group of optical signals and able to transmit at least one of these signals and reflect the signals of the group which are not transmitted andan optical adding means (F2, C) for receiving the thus reflected signals and at least one optical signal to be added among them and which is able to supply a second group of optical signals including the reflecting signals and the signal to be added,said multiplexer being characterized in that it also comprises a photo-induced Bragg grating filter (R), which is optically coupled on one side, to the first multidielectric filter (F1) for receiving the signals reflected by said first filter and, on the other side, to the adding means (F2, C) and able to transmit said reflecting signals to said adding means and reflect to the first filter one or more optical signals, which have the same wavelength or wavelengths as the signal or signals transmitted by said first filter and which are liable to exist among the signals reflected by said first filter.
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Abstract
According to the invention, a first band-pass multidielectric filter (F1) receives optical signals, transmits at least one of them and reflects the untransmitted signals. An adding means (F2) inserts among them at least one other optical signal. A photoinduced Bragg grating filter (R) receives the signals reflected by the first filter and transmits them to the adding means and reflects any optical signal of the same wavelength as the signal transmitted by the first filter and which is liable to exist among the signals reflected by it. Application to optical telecommunications.
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7 Claims
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1. Optical add-drop multiplexer having:
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a first band-pass, multidielectric filter (F1) for receiving a first group of optical signals and able to transmit at least one of these signals and reflect the signals of the group which are not transmitted and an optical adding means (F2, C) for receiving the thus reflected signals and at least one optical signal to be added among them and which is able to supply a second group of optical signals including the reflecting signals and the signal to be added, said multiplexer being characterized in that it also comprises a photo-induced Bragg grating filter (R), which is optically coupled on one side, to the first multidielectric filter (F1) for receiving the signals reflected by said first filter and, on the other side, to the adding means (F2, C) and able to transmit said reflecting signals to said adding means and reflect to the first filter one or more optical signals, which have the same wavelength or wavelengths as the signal or signals transmitted by said first filter and which are liable to exist among the signals reflected by said first filter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification