Intensity modulation of optical signals

Details Intensity modulation of optical signals Intensity modulation of optical signals

2006-04-18

2006-04-18

Kim, Ellen E. (Department: 2874)

Optical: systems and elements

Optical frequency converter

C359S332000

Reexamination Certificate

active

07031047

ABSTRACT:
A wavelength converter or demultiplexer device comprising first and second stages (30, 40). For wavelength converter action, the first stage impresses an intensity modulation (IM) and phase modulation (PM) on a CW input signal (λ1) carried by an input DATA signal (λ2) using cross phase modulation in a non-linear optical element (46). The first stage in an embodiment is a semiconductor laser amplifier loop optical mirror (SLALOM) which has a semiconductor optical amplifier (SOA) as the non-linear optical element. The second stage has a non-linear transfer function and impresses a further IM on the optical signal responsive to the PM impressed in the first stage. In an embodiment, the second stage is a polarization maintaining fiber (PMF) optical loop. The transfer function of the overall device is thus improved by making it steeper and more time confined. This is achieved by combining a fast first stage with a second stage that has a non-linear transfer function, so that the residual PM from the first stage synchronously drives a nonlinear process in the second stage.

REFERENCES:
patent: 5721637 (1998-02-01), Simon et al.
patent: 5798852 (1998-08-01), Billes et al.
patent: 5917972 (1999-06-01), Davies
patent: 6046841 (2000-04-01), Mahgerefteh et al.
patent: 6049642 (2000-04-01), Nakamura et al.
patent: 6101027 (2000-08-01), Lee et al.
patent: 6337762 (2002-01-01), Ueno
patent: 0 717 482 (1996-06-01), None
patent: 0 795 778 (1997-09-01), None
patent: 0 880 054 (1998-11-01), None
patent: 1 093 011 (2001-04-01), None
Spiekman, L. H. et al., “All-Optical Mach-Zehnder Wavelength Converter with Monolithically Integrated DFB Probe Source”, IEEE Photonics Technology Letters, vol. 9, No. 10, pp. 1349-1351, (Oct. 1997).
Eiselt, M. et al., “Polarization Insensitive Frequency Converter with the Capability of Chirp Removal”, IEEE Photonics Technology Letters, vol. 10, No. 1, pp. 63-65, (Jan. 1998).
Tajima, K. et al., “Hybrid Integrated Symmetric Mach-Zehnder All-Optical Switch with Ultrafast, High Extinction Switching”, Electronic Letters, vol., 35, No. 23, pp. 2030-2031, (Nov. 1999).
Nakamura, S. et al., “Ultrafast (200-fs Switching, 1.5-Tb/s Demultiplexing) and High-Repetition (10 GHz) Operations of a Polarization-Discriminating Symmetric Mach-Zehnder All-Optical Switch”, IEEE Photonics Technology Letters, vol. 10, No. 11, pp. 1575-1577, (Nov. 1998).
Nakamura, S. et al., “Demultiplexing of 168-Gb/s Data Pulses with a Hybrid-Integrated Symmetric Mach-Zehnder All-Optical Switch”, IEEE Photonics Technology Letters, vol. 12, No. 4, pp. 425-427, (Apr. 2000).
Davies, D. A. O. et al., “Regenerative 20Gbit/s Wavelength Conversion and Demultiplexing Using a Semiconductor Laser Amplifier Nonlinear Loop Mirror”, Electronics Letters, vol. 31, No. 12, pp. 1000-1001, (Jun. 8, 1995).
Xianbing, L. et al., “Analysis of Toad Switching Characteristics Considering the Gain and Phase Response of a Semiconductor Optical Amplifier to Control Pulses”, Microwave and Optical Technology Letters, vol. 24, No. 6, pp. 374-377, (Mar. 20, 2000).
Davies, D. A. O. et al., “10Gbit/s Data Switched Semiconductor Laser Amplifier Nonlinear Loop Mirror”, Electronics Letters, vol. 31, No. 2, pp. 111-112, (Jan. 19, 1995).
Sokoloff, J. P. et al., “A Terahertz Optical Asymmetric Demultiplexer (TOAD)”, IEEE Photonics Technology Letters, vol. 5, No. 7, pp. 787-790, (Jul. 1993).
Eiself, M. et al., “SLALOM: Semiconductor Laser Amplifier in a Loop Mirror”, Journal of Lightwave Technology, vol. 13, No. 10, pp. 2099-2112, (Oct. 1995).
Mahgerefteh, D. et al., “Enhanced Performance of a March-Zehnder Wavelength Converter Using a Fiber Bragg Grating”, ECOC 98, 20-24, pp. 663-664, (Sep. 1998).
Cho, P. S. et al., “High Performance Non-Interferometric Semiconductor-Optical-Amplifier/Fibre-Bragg-Grating Wavelength Converter”, Electronics Letters, vol. 34, No. 4, pp. 371-373, (Feb. 19, 1998).
Zheng, X. et al., “Experimental Investigation of the Cascadability of a Cross-Gain Modulation Wavelength Converter”, IEEE Photonics Technology Letters, vol. 12, No. 3, pp. 272-274, (Mar. 2000).
Yu, H. Y. et al., “Optimization of the Frequency Response of a Semiconductor Optical Amplifier Wavelength Converter Using a Fiber Bragg Grating”, Journal of Lightwave Technology, vol. 17, No. 2, pp. 308-315, (Feb. 1999).
Mahgerefteh, D. et al., “Technique for Suppression of Pattern Dependence in a Semiconductor-Optical-Amplifier Wavelength Converter”, IEEE Photonics Technology Letters, vol. 9, No. 12, pp. 1583-1585, (Dec. 1997).
Olsson, B. E. et al., “Wavelength Routing of 40Gbit/s Packets with 2.5 Gbit/s Header Erasure/Rewriting Using All-Fibre Wavelength Converter”, Electroncis Letters, vol. 36, No. 4, pp. 345-347, (Feb. 17, 2000).
ÖHlén, P. et al., “Wavelength Dependence and Power Requirements of a Wavelength Converter Based on XPM in a Dispersion-Shifted Optical Fiber”, IEEE Photonics Technology Letters, vol. 12, No. 5, pp. 522-524, (May 2000).
Öhlén, P. et al., “Wavelength Dependence and Power Requirements of a Wavelength Converter Based on XPM in a Dispersion-Shifted Optical Fiber”, CLEO 2000, pp. 279-280, (May 10, 2000).
Yu, H. Y. et al., “Improved Frequency Response of a Semiconductor-Optical-Amplifer Wavelength Converter Using a Fiber Bragg Grating”, Digest of the IEEE/LEOS Summer Topical Meeting, pp. 40-41, (1997).
Cho, P. S. et al., “A High-Performance Semiconductor Optical Amplifier/Fiber Bragg Grating Wavelength Converter”, OFC '98 Technical Digest, pp. 247-248, (1998).
Patrick, D. M. et al., “20Gbit/s Wavelength Conversion Using Semiconductor Nonlinearity”, Electronics Letters, vol. 30, No. 3, pp. 252-253, (Feb. 3, 1994).

Affiliated with

Also associated with

Rating

Intensity modulation of optical signals does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Intensity modulation of optical signals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Intensity modulation of optical signals will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3528140