Optical waveguides – With optical coupler – Input/output coupler
Patent
1997-05-01
1999-08-03
Ngo, Hung N.
Optical waveguides
With optical coupler
Input/output coupler
385 11, 385 24, G02B 626
Patent
active
059335556
ABSTRACT:
An optical depolarizer and method of depolarizing light is described. An input light beam is split into two beams. One split beam is recirculated through a birefringent medium and looped back to be recombined with the input light. This allows a weighted averaging of the different polarization states that result from birefringence in the recirculation path of the recirculated beam. The depolarizer is formed from single mode fiber optic cables and fused single mode fiber couplers. Each fiber coupler has an input pair of fibers and an output pair of fibers. One of the output fibers is coupled to one of the input fibers to form a recirculation loop. Additionally, polarization controllers provided in the input fiber and recirculation loop allow the degree of polarization of the output beam to be varied across a wide spectrum of values.
REFERENCES:
patent: 4922309 (1990-05-01), Sekiwa et al.
patent: 5075893 (1991-12-01), Epstein et al.
patent: 5159481 (1992-10-01), Maeda
patent: 5164854 (1992-11-01), Takanashi et al.
patent: 5218652 (1993-06-01), Lutz
patent: 5245407 (1993-09-01), Nishiura et al.
patent: 5293264 (1994-03-01), Van Deventer
patent: 5408545 (1995-04-01), Lee et al.
patent: 5446533 (1995-08-01), Udd et al.
patent: 5457756 (1995-10-01), Hartl et al.
patent: 5486916 (1996-01-01), Michal et al.
patent: 5644397 (1997-07-01), Blake
Burns, W., "Degree of Polarization in the Lyot Depolarizer," Journal of Lightwave Technology, vol. LT-1, No. 3, pp. 475-478, (Sep. 1983).
Cooper, P.R., "All-fibre Lyot depolarizer," Optics and Laser Technology, vol.18,No.2, pp. 99-100, (Apr. 1986).
Heismann, F., "Analysis of a Reset-Free Polarization controller for Fast Automatic Polarization Stabilization in Fiber-optic Transmission Systems," Journal of Lightwave Technology, vol.12, No.4, pp. 690-698, (Apr. 1994).
Heismann, F., et al., "Electrooptic Polarization Scramblers for Optically Amplified Long-Haul Transmission Systems," IEEE Photonics Technology Letters, vol.6, No. 9, pp. 1156-1158, (Sep. 1994).
Heismann, F., et al., "Polarization-independent electro-optic depolarizer," Optics Letters, vol.20,No.9, pp. 1008-1010, (May 1, 1995).
Howerton, M., et al., "Depolarized Source for High Power Remote Operation of an Integrated Optical Modulator," IEEE Photonics Technology Letters, vol.6, No.1, pp. 115-117, (Jan. 1994).
Kersey, D., et al., "Monomode Fibre Polarisation Scrambler," Electronics Letters, vol.23, No.12, pp. 634-636, (Jun. 4, 1987).
Koehler, B., et al., "In-line single-mode fiber polarization controllers at 1.55, 1.30 and 0.63 .mu.m," Applied Optics, vol.24, No.3, pp. 349-352, (Feb. 1, 1985).
Lefevre, H.C., "Single-Mode Fibre Fractional Wave Devices and Polarisation Controllers," Electronics Letters, vol. 16, No. 20 pp. 778-780 (Sep. 26, 1980).
Lutz, D., "A Passive Fiber-Optic Depolarizer," IEEE Photonics Technology Letters, vol.4, No.4, pp. 463-465, (Apr. 1993).
Maeda, M., et al., "New passive polarization scrambler for lightwave systems," OFC, p. 211, (Feb. 22, 1991).
Matsumoto, T., et al., "Proposal for a Fiber-Optic Endlessly Rotatable Fractional Wave Device and Its Applications to Lightwave Technologies," Electronics and Communications in Japan, Part 2, vol.71, No.6, pp. 36-47 (1988).
Santoro, M., et al., "Polarization Scrambling Using a Short Piece of High-Birefringence Optical Fiber and a Multifrequency Laser Diode," Journal of Lightwave Technology, vol.12, No. 2, pp. 288-293, (Feb. 1994).
Shen, Pai-Sheng, "A True Single-Mode Fiber Depolarizer Based On Incoherent Recirculating Delay Line,""Ph.D. Dissertation, Arizona State University, (May 1997).
Shen, P., et al., "Tunable singlemode fibre depolariser," Electronics Letters, vol.33, No.12, pp. 1077-1078, (Jun. 5, 1997).
Shen, P., et al., "New Single-Mode Fiber Polarization Scrambler," Optical Fiber Technology 3, Article No. OF970217, pp. 184-188, (1997).
Shen, P., et al., "Fiber recirculating delay-line tunable depolarizer," Applied Optics, vol.37, No. 3, pp. 443-448, (Jan. 20, 1998).
Takada, K., et al., "New Fiber-Optic Depolarizer," Journal of Lightwave Technology, vol.LT-4,No.2, pp. 213-219, (Feb. 1986).
Takada, K, et al., "Development of Fiber-Optic Depolarizer and Its Application to Measurement Systems for Polarization-Insensitive Operation of Silica-Waveguide Matrix Switches," Journal of Lightwave Technology, vol.12, No. 9, pp. 1640-1647 (Sep. 1994).
Vizoso, B., et al., "Amplified Fiber-Optic Recirculating Delay Lines," Journal of Lightwave Technology, vol.12,No.2, pp. 294-305, (Feb. 1994).
Yamashita, S., et al., "Polarization-Independent Depolarizers for Highly Coherent Light Using Faraday Rotator Mirrors," Journal of Lightwave Technology, vol.15, No.5, pp. 900-905, (May 1997).
Alliance Fiber Optics Products, Inc.
Ngo Hung N.
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