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US 6,611,640 B2Granted
Optical dispersion compensator
AssigneeEvident Technologies
InventorsMichael LoCasclo, Clinton T. Ballinger, Daniel P. Landry
Life of this patent
Estimating the term…
Abstract
An optical dispersion compensator includes a saturable absorber. Coupled to the saturable absorber is a pre-amplifier and a post-amplifier. The saturable absorber compresses optical pulse signals based upon the amplitude envelope of the optical pulse in order to prevent optical dispersion.
Claims23
An optical dispersion compensator comprising:
- a saturable absorber having an input and an output;
- a first optical amplifier coupled to said input;
- and
- a second optical amplifier coupled to said output;
- wherein said saturable absorber receives an optical pulse having tail regions and a central region, and absorbs the tail regions at a higher rate than the central region, and the absorption is performed in accordance with the following equation:
- I out ( t ) = ( I peak ) ⅇ ( - t 2 2 σ 2 ) × ⅇ ( - α 0 L 1 + ( I peak ) ⅇ ( - t 2 2 σ 2 ) I sat - α b L )
- wherein Iout is an intensity profile of the optical pulse after passing through the saturable absorber, Ipeak is a peak of the optical pulse, Isat is an intensity at which an absorption coefficient drops to ½ its low field value, t is a time, σ is a standard deviation in units of time, α0 is a low field absorption, αB is a non-saturating background absorption, and L is a length of the saturable absorber.
4 more elements
An optical dispersion compensator comprising:
- a doped fiber comprising quantum dot semiconductor nanoparticles;
- and
- a pump laser coupled to said doped fiber;
- wherein said doped fiber receives an optical pulse having tail regions and a central region, and saturably absorbs the tail regions at a higher rate than the central region, and the absorption is performed in accordance with the following equation:
- I out ( t ) = ( I peak ) ⅇ ( - t 2 2 σ 2 ) × ⅇ ( - α 0 L 1 + ( I peak ) ⅇ ( - t 2 2 σ 2 ) I sat - α b L )
- wherein Iout is an intensity profile of the optical pulse after passing through the doped fiber, Ipeak is a peak of the optical pulse, Isat is an intensity at which an absorption coefficient drops to ½ its low field value, t is a time, σ is a standard deviation in units of time α0 is a low field absorption, αB is a non-saturating background absorption, and L is a length of the doped fiber.
3 more elements
A method of performing optical dispersion compensation comprising:
- receiving an optical pulse having tail regions and a central region;
- and
- absorbing the tail regions at a higher rate than the central region in a saturable absorber
- wherein said absorbing step is performed in accordance with the following equation:
- I out ( t ) = ( I peak ) ⅇ ( - t 2 2 σ 2 ) × ⅇ ( - α 0 L 1 + ( I peak ) ⅇ ( - t 2 2 σ 2 ) I sat - α b L )
- wherein Iout is an intensity profile of the optical pulse after passing through the saturable absorber, Ipeak is a peak of the optical pulse, Isat is an intensity at which an absorption coefficient drops to ½ its low field value, t is a time, σ is a standard deviation in units of time, α0 is a low field absorption, αB is a non-saturating background absorption, and L is a length of the saturable absorber.
3 more elements
Dependencies are inferred from the claim text.