Wavelength grid for DWDM
First Claim
1. A method of transmitting a wavelength multiplexed signal carrying higher bitrate wavelength channels having a wider, regular channel spacing through an optical transport network designed for the transport of wavelength division multiplexed signals carrying lower bitrate wavelength channels having a narrower channel spacing and conforming with a predefined wavelength grid, said method comprises the steps of:
- generating optical signals at wavelengths corresponding to said higher bitrate wavelength channels, wherein said wavelengths are detuned from corresponding wavelengths of said predefined wavelength grid by at least 30% of said narrower channel spacing and combining said optical signals to form said wavelength multiplexed signal for transmission.
1 Assignment
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Accused Products
Abstract
In order to allow transmission of higher bitrate optical wavelength channels (C1-C4) over a transport network designed for the transmission of lower bitrate optical wavelength channels (A1-A8), the wavelengths of the higher bitrate wavelength channels (C1-C4) are detuned by at least 30% of the channel spacing (S2) the lower bitrate wavelength channels (A1-A8) with respect to a predefined ITU wavelength grid.
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Citations
11 Claims
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1. A method of transmitting a wavelength multiplexed signal carrying higher bitrate wavelength channels having a wider, regular channel spacing through an optical transport network designed for the transport of wavelength division multiplexed signals carrying lower bitrate wavelength channels having a narrower channel spacing and conforming with a predefined wavelength grid, said method comprises the steps of:
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generating optical signals at wavelengths corresponding to said higher bitrate wavelength channels, wherein said wavelengths are detuned from corresponding wavelengths of said predefined wavelength grid by at least 30% of said narrower channel spacing and combining said optical signals to form said wavelength multiplexed signal for transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An optical transmission system comprising
at least one wavelength blocker or wavelength selective switch for blocking individual wavelengths from a wavelength division multiplexed signal, wherein the wavelength blocker or wavelength selective switch is designed for operation with wavelength division multiplexed signals carrying lower bitrate wavelength channels having a narrower channel spacing and conforming with a predefined wavelength grid; - and
an optical transmitter for generating a higher bitrate optical signal at a wavelength corresponding to a higher bitrate wavelength channel of the wavelength division multiplexed signal to be transmitted, wherein said higher bitrate wavelength channels have a wider channel spacing and wherein said wavelengths are detuned from corresponding wavelengths of said predefined wavelength grid by at least 30% of said narrower channel spacing.
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9. An optical network element comprising a wavelength blocker or a wavelength selective switch for blocking individual wavelengths from a wavelength division multiplexed signal carrying higher bitrate wavelength channels having a wider channel spacing, wherein the wavelength blocker or wavelength selective switch is designed for operation with wavelength division multiplexed signals carrying lower bitrate wavelength channels having a narrower channel spacing and conforming with a predefined wavelength grid;
- and a control means for controlling said wavelength blocker or wavelength selective switch which is adapted to configure said wavelength blocker or wavelength selective switch to block two adjacent wavelengths of said predefined wavelength grid to extract one of said higher bitrate wavelength channels.
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10. A method of transmitting a wavelength multiplexed signal carrying wavelength channels having a narrower, regular channel spacing through an optical transport network designed for the transport of wavelength division multiplexed signals carrying wavelength channels having a wider channel spacing and conforming with a predefined wavelength grid, said method comprises the steps of:
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generating optical signals at wavelengths corresponding to said narrower channel spacing, wherein said wavelengths are detuned from corresponding wavelengths of said predefined wavelength grid by at least 30% of said narrower channel spacing and combining said optical signals to form said wavelength multiplexed signal for transmission. - View Dependent Claims (11)
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Specification