Method and apparatus for validating a path through a switched optical network
AssigneeTellabs Operations, Inc.
InventorsDmitry Levandovsky, Srinivas V. Makam, Vishal Sharma
Life of this patent
Estimating the term…
Abstract
A method for validating a path through a switched optical network is disclosed. A bit error rate at the end of the path is determined. The path is validated if the bit error rate is within a predefined range.
Claims7
A method for selecting a path through a switched optical network comprising:
- identifying a bit error rate of paths through the switched optical network that include a noise figure for each element on the paths by
- determining an equivalent average number of noise photons per bit at an input of the element,
- determining an average number of photons per bit at the output of a previous element,
- determining an optical power gain of the element,
- determining a constant related to deviation of the statistical noise distribution, and
- determining a number of modes detectable at an end of the path by the receiver;
- and
- validating the path if the bit error rate is within a predefined range.
A method for selecting a path through a switched optical network, comprising:
- identifying bit error rates of paths through the switched optical network that include a noise figure for each element on the paths by
- computing NFiPoission=2nieq+1/Gi+└1+nieqViGi┘└Mnieq/(Gi<ni−1>)┘ where nieq is an equivalent average number of noise photons per bit added by the element, Vi is a constant that accounts for deviation of a statistical noise distribution, Gi is an optical power gain for the element, M is a number of modes detectable at an end of the path, and <ni−1> is the average number of photons at an output of a previous element in the path;
- and
- validating the path if the bit error rate is within a predefined range.
A method for selecting a path through a switched optical network, comprising:
- identifying bit error rates of paths through the switched optical network that include a noise figure for each element on the paths by computing NFiTotal=NFi−1Total+Ai−1(NF iPoisson −1) for a path containing “i” elements, wherein Ai≡Ai−1(gi/Gi) is defined recursively with excess noise factor gi=1+M(nieq/<ni−1>);
- and
- validating the path if the bit error rate is within a predefined range.
A method for validating a path through a switched optical network, comprises:
- determining an optical Signal to Noise ratio at an output of an element in the path that includes a total noise figure for a chain including all preceding elements up to an including a present element of the path by recursively computing NFiTotal=NFi−1Total+A i−1(NFiPoisson−1) for the path containing “i” elements, wherein Ai≡Ai−1(gi/Gi) is defined recursively with excess noise factor gi1+M(nieq/<ni−1>);
- modifying the path if the optical Signal to Noise ratio at the element is outside a predefined range;
- and
- validating the pat if the optical Signal to Noise ratio at the receiver are within a predefined range.
A computer-readable medium having stored thereon sequences of instructions, the sequences of instructions including instructions which, when executed by a processor, causes the processor to perform:
- determining a bit error rate of paths that including a noise figure for each element on the paths comprising
- determining an equivalent average number of noise photons per bit at an input of the element;
- determining an average number of photons per bit at an output of a previous element;
- determining an optical power gain of the element;
- determining a constant related to deviation of a statistical noise distribution;
- and determining a number of modes detectable at an end of the path;
- and
- validating the pat if the bit error rate is within a predefined range.
Dependencies are inferred from the claim text.