US5577057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modelocked lasers
Assignee: Telstra Corp Ltd
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Filing: 1992-03-02
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Granted: 1996-11-19
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Expires: 2012-03-02
Abstract
Abstract A configuration enabling passive modelocking in an optical fiber device is disclosed, utilizing the non-linear Kerr effect. Various configurations are disclosed, using both standard and polarization maintaining fiber, and a bulk optics implementation. One embodiment comprises a figure of eight arrangement formed by two cross-coupled fiber loops, one of the loops being a Sagnac mirror. A further embodiment exploits the non-linearity of polarization in polarization maintaining fibers.
Inventors
- 👤 Steven J. Frisken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:17
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/11; H01S3/1106; H01S3/1112; H01S3/05; H01S3/06; H01S3/063; H01S3/067; H01S3/06791
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
152 words
A mode-locked laser device comprising a first optical fiber path forming a loop, a second optical fiber path forming a loop, and coupling means for connecting said first and second optical paths to form a figure eight topography whereby a light waveform propagating in said second optical path is coupled into said first optical path in the form of two counter-propagating light waveforms; at least one of said first and second optical paths including means for coupling pump light into said device, at least one of said first and second optical paths including means for coupling output pulses from said device, at least one of said first and second optical paths including means for providing optical gain, and at least one of said first and second optical paths including means having a refractive index dependent on light intensity wherein said first and second optical paths operatively propagate light having different polarization modes.
Claim 2
Dependent Claim
152 words
A mode-locked laser device comprising a first optical fiber path forming a loop, a second optical fiber path forming a loop, and coupling means for connecting said first and second optical paths to form a figure eight topography whereby a light waveform propagating in said second optical path is coupled into said first optical path in the form of two counter-propagating light waveforms; at least one of said first and second optical paths including means for coupling pump light into said device, at least one of said first and second optical paths including means for coupling output pulses from said device, at least one of said first and second optical paths including means for providing optical gain, and at least one of said first and second optical paths including means having a refractive index dependent on light intensity wherein said first and second optical paths operatively propagate light having different polarization modes.
Claim 3
Dependent Claim
34 words
A device according to claim 1 wherein one of said first and second optical paths includes both said means for providing optical gain and said means having a refractive index dependent on light intensity.
Claim 4
Dependent Claim
23 words
A device according to claim 2, wherein the other of said first and second optical paths includes second means for providing optical gain.
Claim 5
Dependent Claim
20 words
A device according to claim 3, wherein said second means for providing gain provides higher gain than said first means.
Claim 6
Dependent Claim
20 words
A device according to claim 4, wherein said first means for providing optical gain provides about 4.8 dB of gain.
Claim 7
Dependent Claim
13 words
A device according to claim 5, wherein said means comprise polarization maintaining fibre.
Claim 8
Dependent Claim
14 words
A device according to claim 2, wherein said second optical path is substantially unidirectional.
Claim 9
Dependent Claim
17 words
A device according to claim 2, wherein said first optical path further includes means for controlling polarization.
Claim 10
Dependent Claim
36 words
A device according to claim 2, wherein said coupling means has two outputs, and a splitting ratio whereby each of said outputs receives about 50% of the light incident at an input of said coupling means.
Claim 11
Dependent Claim
37 words
A device according to claim 2, wherein said means for providing gain comprises a length of erbium doped optical fibre, and said means having a refractive index dependent on light intensity comprises a length of optical fibre.
Claim 12
Dependent Claim
36 words
A device according to claim 2, wherein said means for providing gain comprises a length of erbium doped optical fibre, and said means having a refractive index dependent on light intensity comprises a semiconductor optical amplifier.
Claim 13
Dependent Claim
14 words
A device according to claim 1, wherein said second optical path is substantially unidirectional.
Claim 14
Dependent Claim
17 words
A device according to claim 12, wherein said first optical path further includes means for controlling polarization.
Claim 15
Dependent Claim
36 words
A device according to claim 12, wherein said coupling means has two outputs and a splitting ratio whereby each of said outputs receives about 50% of the light incident at an input of said coupling means.
Claim 16
Dependent Claim
37 words
A device according to claim 12, wherein said means for providing gain comprises a length of erbium doped optical fibre, and said means having a refractive index dependent on light intensity comprises a length of optical fibre.
Claim 17
Dependent Claim
36 words
A device according to claim 12, wherein said means for providing gain comprises a length of erbium doped optical fibre, and said means having a refractive index dependent on light intensity comprises a semiconductor optical amplifier.
Claim 18
Dependent Claim
17 words
A device according to claim 1, wherein said first optical path further includes means for controlling polarization.
Claim 19
Dependent Claim
14 words
A device according to claim 17, wherein said second optical path is substantially unidirectional.
Claim 20
Dependent Claim
36 words
A device according to claim 1 wherein said coupling means has two outputs and a splitting ratio whereby each of said outputs receives about 50% of the light incident at an input of said coupling means.
Claim 21
Dependent Claim
37 words
A device according to claim 1, wherein said means for providing gain comprises a length of erbium doped optical fibre, and said means having a refractive index dependent on light intensity comprises a length of optical fibre.
Claim 22
Dependent Claim
36 words
A device according to claim 1, wherein said means for providing gain comprises a length of erbium doped optical fibre, and said means having a refractive index dependent on light intensity comprises a semiconductor optical amplifier.
References Cited (Backward Citations)
US3873825A
Cited
US3988704A
Cited
US4787714A
Cited
US5018857A
Cited
JPH02310982A
Cited
US5050183A
Cited
US5311525A
Cited
US5251230A
Cited
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| 7.5 Years (Year 8) | 2003-11-19 | 2004-05-20 | 2004-11-19 | $3760.00 | Window Closed / Lapsed |
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