Claims
- 1. A device for integrating demultiplexing and optical channel monitoring, comprising:
a diffraction grating; an input waveguide providing an optical input to said diffraction grating; a first set of output waveguides providing optical outputs to said diffraction grating at a predetermined order of diffraction; and a second set of output waveguides providing monitor outputs to said diffraction grating at another order of diffraction different from said predetermined order of diffraction.
- 2. A device as claimed in claim 1, wherein said another order of diffraction is higher than said predetermined order of diffraction.
- 3. A device as claimed in claim 2, further comprising a third set of outputs at a further order of diffraction different from said predetermined order of diffraction and said another order of diffraction, said third set of outputs providing monitor outputs to said diffraction grating.
- 4. A device as claimed in claim 3, wherein said further order of diffraction is lower than said predetermined order of diffraction.
- 5. A device as claimed in claim 4, wherein said predetermined order of diffraction is order n, said another order of diffraction is order n+1, and said further order of diffraction is order n−1.
- 6. A device as claimed in claim 3, wherein said second set of output waveguides are positioned at channel locations, and said third set of waveguides are positioned at between-channel locations to provide information on inter-channel noise.
- 7. A device as claimed in claim 1, further comprising a detector array coupled to said second set of waveguides.
- 8. A device as claimed in claim 7, wherein said diffraction grating is an echelle grating.
- 9. A device as claimed in claim 8, which is in the form of an integrated optical device.
- 10. A method of performing demultiplexing and optical channel monitoring, comprising the steps of:
directing an optical input signal containing multiple channels to a diffraction grating; receiving reflected and diffracted signals at a first set of output waveguides providing optical outputs at a predetermined order of diffraction; and receiving reflected and diffracted signals at a second set of output waveguides providing monitor outputs at another order of diffraction different from said predetermined order of diffraction.
- 11. A method as claimed in claim 10, wherein said another order of diffraction is higher than said predetermined order of diffraction.
- 12. A method as claimed in claim 11, wherein reflected and diffracted signals are received at a third set of outputs at a further order of diffraction different from said predetermined order of diffraction and said another order of diffraction, said third set of outputs providing monitor outputs to said diffraction grating.
- 13. A method as claimed in claim 12, wherein said further order of diffraction is lower than said predetermined order of diffraction.
- 14. A method as claimed in claim 13, wherein said predetermined order of diffraction is order n, said another order of diffraction is order n+1, and said further order of diffraction is order n−1.
- 15. A method as claimed in claim 12, wherein said second set of output waveguides are positioned at channel locations, and said third set of waveguides are positioned at between-channel locations to provide information on inter-channel noise.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims the benefit under 35 USC 119(e) of prior U.S. provisional application serial No. 60/386,717 filed Jun. 10, 2002.
Provisional Applications (1)
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Number |
Date |
Country |
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60386717 |
Jun 2002 |
US |