Directionless and colorless reconfigurable optical add/drop multiplexer
First Claim
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1. A directionless and colorless reconfigurable optical add/drop multiplexer (ROADM) for a plurality of clients, comprising:
- an add/drop interface for optical signals of at least one optical network,wherein each received optical signal is split by at least one optical splitter into optical signals which are applied to a downstream cross connector distributing the split optical signals to wavelength selectors of different clients,wherein each wavelength selector performs a wavelength selection of at least one wavelength from the distributed optical signals,wherein each wavelength selector comprises a wavelength selective switch, the wavelength selective switch comprising a grating filter and at least one of a liquid crystal on silicon switch (LCOS), a liquid crystal switch (LC), and a digital light processing switch (DLP),wherein an optical signal having a selected wavelength (λ
) is applied to at least a plurality of client transponders of the plurality of clients, andwherein each client transponder is connected to a corresponding (1×
M) optical switch switching an optical signal transmitted by said client transponder to an upstream cross connector distributing the transmitted optical signals to M optical combiners connected to said optical add/drop interface.
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Abstract
The invention relates to a directionless and colorless reconfigurable optical add/drop multiplexer (ROADM) for a number of clients comprising:
- an add/drop interface for optical signals of at least one optical network,
- wherein each received optical signal is split by at least one optical splitter into optical signals which are applied to a downstream cross connector distributing the split optical signals to wavelength selectors of different clients,
- wherein each wavelength selector performs a wavelength selection of at least one wavelength from the distributed optical signals,
- wherein an optical signal having a selected wavelength (λ) is applied to a client transponder of a client.
10 Citations
19 Claims
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1. A directionless and colorless reconfigurable optical add/drop multiplexer (ROADM) for a plurality of clients, comprising:
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an add/drop interface for optical signals of at least one optical network, wherein each received optical signal is split by at least one optical splitter into optical signals which are applied to a downstream cross connector distributing the split optical signals to wavelength selectors of different clients, wherein each wavelength selector performs a wavelength selection of at least one wavelength from the distributed optical signals, wherein each wavelength selector comprises a wavelength selective switch, the wavelength selective switch comprising a grating filter and at least one of a liquid crystal on silicon switch (LCOS), a liquid crystal switch (LC), and a digital light processing switch (DLP), wherein an optical signal having a selected wavelength (λ
) is applied to at least a plurality of client transponders of the plurality of clients, andwherein each client transponder is connected to a corresponding (1×
M) optical switch switching an optical signal transmitted by said client transponder to an upstream cross connector distributing the transmitted optical signals to M optical combiners connected to said optical add/drop interface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 18, 19)
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15. A directionless and colorless reconfigurable optical add/drop multiplexer (ROADM) for a plurality of clients, comprising:
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an add/drop interface for optical signals of at least one optical network, wherein each optical signal is split by at least one optical splitter into optical signals which are applied to at least one contentionless downstream (M×
S) wavelength selective switch switching the split optical signals to client transponders of S different clients of said plurality of clients,wherein each client transponder is connected to a corresponding (1×
M) optical switch switching an optical signal transmitted by said client transponder to an upstream cross connector distributing the transmitted optical signals to M optical combiners connected to said optical add/drop interface,wherein each wavelength selective switch comprises a grating filter and at least one of a liquid crystal on silicon switch (LCOS), a liquid crystal switch (LC), and a digital light processing switch filter (DLP. - View Dependent Claims (16)
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17. A method for dropping an optical signal with a selectable wavelength (λ
- ) comprising;
splitting the optical signal into several optical signals; distributing the split optical signals to wavelength selectors of all clients; performing a wavelength selection of the distributed optical signals via a wavelength selector; and applying an optical signal having the selected wavelength (λ
) to a client,wherein each of said plurality of clients comprises a client transponder; and wherein each client transponder is connected to a corresponding (1×
M) optical switch switching an optical signal transmitted by said client transponder to an upstream cross connector distributing the transmitted optical signals to M optical combiners connected to said optical add/drop interface, andwherein said wavelength selector comprises a wavelength selective switch, the wavelength selective switch comprising a grating filter and at least one of a liquid crystal on silicon switch (LCOS), a liquid crystal switch (LC), and a digital light processing switch(DLP).
- ) comprising;
Specification