Optical waveguides – With optical coupler
Patent
1995-09-14
1997-05-13
Bovernick, Rodney B.
Optical waveguides
With optical coupler
385 14, 385 17, G02B 624
Patent
active
056299923
ABSTRACT:
An optical filter, such as a wavelength-division multiplexer, demultiplexer, or optical router, in which several single-mode waveguides are coupled to the sides of an optical interaction region containing a wavelength dispersive element that collects light from one or more input waveguides inputting light to the interaction region and disperses it according to wavelength to one or more output waveguides outputting wavelength-separated light. According to the invention, a multi-moded waveguide is interposed between one or more of the single-moded waveguides and the optical interaction region. It has a predetermined length to create at one end a multiply peaked image of a singly peaked profile presented to it at the other end, thus being a multi-mode interference (MMI) filter that presents a flatter filter profile at the interface between the MMI and the optical interaction region and affords reduced filter sensitivity to wavelength drift of an optical signal. The wavelength dispersive element is preferably an arrayed waveguide grating between two optical interaction regions at the input and output sides. Several optical switches, multiplexers, and add-drop circuits have architectures that beneficially use the filter of the invention.
REFERENCES:
patent: 5002350 (1991-03-01), Dragone
patent: 5136671 (1992-08-01), Dragone
Soldano et al, "Planar Monomode Optical Couplers Based on Multimode Interference Effects", Journal of Lightwave Technology, vol. 10 No. 12, pp. 1843-1850. Dec. 1992.
van Roijen et al, "Compact InP-based ring lasers employing multimode interference couplers and combiners", Appl. Phys. Lett. 64 (14), pp. 1753-1755. Apr. 1994.
Adar et al., "Broad-Band Array Multiplexers Made with Silica Waveguides on Silicon," Journal of Lightwavbe Technology, vol. 11, 1993, pp. 212-218 (Feb.).
Amersfoort et al., "Phased-array wavelength demultiplexer with flattened wavelength response," Electronics Letters, vol. 30, 1994, pp. 300-302 (Feb.).
Brackett et al., "A Scalable Multiwavelength Multihop Optical Network: A Proposal for Research on All-Optical Networks" Journal of Lightwave Technology, vol. 11, 1993, pp. 736-753 (May/Jun.).
Cremer et al., "Grating spectrograph in In GaAsP/InP for dense wavelength division multiplexing," Applied Physics Letters, 1991, pp. 627-629 (Aug.).
Girton et al., "20GHz electro-optic polymer Mach-Zehnder modulator," Applied Physics Letters, vol. 58, 1991, pp. 1730-1732 (Apr.).
Glance et al., "Applications of the Integrated Wavegtuide Grating Router," Journal of Lightwave Technology, vol. 12, 1994, pp. 957-961 (Jun.).
Ishida et al., "Multichannel Frequency-Selective Switch Employing an ARrayed-Waveguide Grating Multiplexer with Fold-Back Optical Paths," IEEE Photonics Technology Letters, vol. 6, 1994, pp. 1219-1221 (Oct.).
Laube et al., "Selective Area Growth of Q/Q-MQW Structures for Active/Passive 2 .times.2 Space Switch Matrices," Proceedings 7th European Conference on Integrated Optics, Apr. 3-6, 1995, pp. 527-530.
Marcuse, Theory of Dielectric Optical Waveguides, 2d ed., (Academic, 1974), pp. 1-19 (no month avail.).
"Mottier, Integrated optics at the Laboratoire d'Electroniqe, de Technologie et d'Instrumentation," International Journal of Optoelectronics, vol. 9, 1994, pp. 125-134 (no month available).
Okamoto et al., "Arrayed-waveguide grating multiplexer with flat spectral response," Optics Letters, vol. 20, 1995, pp. 43-45 (Jan.).
Okamoto et al., "16-channel optical add/drop multiplexer using silica-based arrayed-waveguide gratings," Electronics Letters, vol. 1995, pp. 723-724 (Apr.).
Poguntke et al., "High-performance InP reflection-grating wavelength multiplexer," Electronics Letters, 1994, pp. 512, 513 (Mar.).
Smit, "New focusing and dispersive planar component based on an optical phased array,", Electronics Letters, vol. 24, 1988,pp. 385-386 (Mar.).
Soldano, Multimode Interference Couplers: Design and Applications, Delft University Press, 1994, pp. 9-35, 57-62, 84-89 (no month available).
Soldano et al., "Optical Multi-Mode Interference Devices Based on Self-Imaging: Principles and Applications", Journal of Lightwave Technology, vol. 13, 1995, pp. 615-627 (Apr.).
Steenbergen et al., "4-channel wavelength flattened demultiplexer integrated with photodetectors," Proceedings 7th European Conference on Integrated OpticsApr. 3-6, 1995, Delft, The Netherlands, pp. 271-274.
Suzuki et al., "Multichannel optical wavelength selective switch with arrayed-waveguide grating multiplexer," Electronics Letters, vol. 30, 1994, pp. 1091, 1092 (Jun.).
Syms, "Silica-on silicon integrated optics," Advances in Integrated Optics, eds. Martellucci et al., Plenum Press, 1994, pp. 121-150 (no month available).
Tachikawa et al., "Arrayed-waveguide grating add-drop multiplexer with loop-back optical paths," Electronics Letters, 1993, vol. 29, pp. 2133, 2134 (Nov.).
Takahashi et al., "Arrayed-waveguide for wavelength division multi-demultiplexer with nanmetre resolution," Electronics Letters, vol. 26, 1990, pp. 87, 88 (Jan.).
Thompson et al., "Fabrication of a Low Loss Inegrated InGaAsP/InP Demultiplexer using CH.sub.4 /H.sub.2 /CO.sub.2 Reactive Ion Etching," European Conference on Integrated Optics, 1993 (no month available).
Vance et al., "Asymmetric adiabatic multiprong for mode-multiplexed systems," Electronics Letters, vol. 24, pp. 2134-2135 (Nov. 1993).
Vellekoop et al., "Four-Channel Inegrated-Optic Wavelength Demultiplexer With Weak Polarization Dependence," Journal of Lightwave Technology, vol. 9, 1991, pp. 310-314 (Mar.).
Vinchant et al., "Low driving voltage or current digital optical switch on InP for multiwavelength system applications," Electronics Letters, vol. 28, 1992, pp. 1135, 1136 (Jun.).
Young et al., "A 16.times.1 Wavelength Division Multiplexer with Integrated Distributed Bratgg Reflector Lasers and Electroabsorption Modulators", IEEE Photonics Technology Letters, 5, 1993, pp. 908-910 (Aug.).
Zah et al., "Multiwavelength light source with integrated DFB laser Array and star coupler for WDM lightwave communications," International Journal of High Speed Electronics and Systems, vol. 3, 1994, pp. 91-109 (no month avail.).
Zirngibl et al., "Demonstration of a 15.times.15 Arrayed Waveguide Multiplexer on InP," IEEE Photonics Technology Letters, vol. 4, 1992, pp. 1250-1253 (Nov.).
Amersfoort Martin R.
Soole Julian B. D.
Bell Communications Research Inc.
Bovernick Rodney B.
Falk James W.
Giordano Joseph
Song Yisun
LandOfFree
Passband flattening of integrated optical filters does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Passband flattening of integrated optical filters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Passband flattening of integrated optical filters will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1391989