DE3872103D1 - Vorrichtung fuer optischen wellenlaengenmultiplexer. - Google Patents
Vorrichtung fuer optischen wellenlaengenmultiplexer.Info
- Publication number
- DE3872103D1 DE3872103D1 DE8888902183T DE3872103T DE3872103D1 DE 3872103 D1 DE3872103 D1 DE 3872103D1 DE 8888902183 T DE8888902183 T DE 8888902183T DE 3872103 T DE3872103 T DE 3872103T DE 3872103 D1 DE3872103 D1 DE 3872103D1
- Authority
- DE
- Germany
- Prior art keywords
- optical wavelength
- wavelength multiplexer
- multiplexer
- optical
- wavelength
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/14—External cavity lasers
- H01S5/141—External cavity lasers using a wavelength selective device, e.g. a grating or etalon
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/12007—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind forming wavelength selective elements, e.g. multiplexer, demultiplexer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
- G02B6/29305—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating as bulk element, i.e. free space arrangement external to a light guide
- G02B6/2931—Diffractive element operating in reflection
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
- G02B6/29316—Light guides comprising a diffractive element, e.g. grating in or on the light guide such that diffracted light is confined in the light guide
- G02B6/29325—Light guides comprising a diffractive element, e.g. grating in or on the light guide such that diffracted light is confined in the light guide of the slab or planar or plate like form, i.e. confinement in a single transverse dimension only
- G02B6/29328—Diffractive elements operating in reflection
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
- G02B6/29382—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM including at least adding or dropping a signal, i.e. passing the majority of signals
- G02B6/29383—Adding and dropping
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4206—Optical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4246—Bidirectionally operating package structures
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4249—Packages, e.g. shape, construction, internal or external details comprising arrays of active devices and fibres
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4249—Packages, e.g. shape, construction, internal or external details comprising arrays of active devices and fibres
- G02B6/425—Optical features
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08004—Construction or shape of optical resonators or components thereof incorporating a dispersive element, e.g. a prism for wavelength selection
- H01S3/08009—Construction or shape of optical resonators or components thereof incorporating a dispersive element, e.g. a prism for wavelength selection using a diffraction grating
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/506—Multiwavelength transmitters
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29331—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by evanescent wave coupling
- G02B6/29332—Wavelength selective couplers, i.e. based on evanescent coupling between light guides, e.g. fused fibre couplers with transverse coupling between fibres having different propagation constant wavelength dependency
- G02B6/29334—Grating-assisted evanescent light guide couplers, i.e. comprising grating at or functionally associated with the coupling region between the light guides, e.g. with a grating positioned where light fields overlap in the coupler
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
- H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
- H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
- H01S5/4031—Edge-emitting structures
- H01S5/4062—Edge-emitting structures with an external cavity or using internal filters, e.g. Talbot filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
- H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
- H01S5/4087—Array arrangements, e.g. constituted by discrete laser diodes or laser bar emitting more than one wavelength
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Plasma & Fusion (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Couplings Of Light Guides (AREA)
- Semiconductor Lasers (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8706014A GB2202404B (en) | 1987-03-13 | 1987-03-13 | Apparatus for optical wavelength division multiplexing |
PCT/GB1988/000191 WO1988007216A1 (en) | 1987-03-13 | 1988-03-11 | Apparatus for optical wavelength division multiplexing |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3872103D1 true DE3872103D1 (de) | 1992-07-23 |
DE3872103T2 DE3872103T2 (de) | 1993-01-07 |
Family
ID=10613913
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE8888902183T Expired - Fee Related DE3872103T2 (de) | 1987-03-13 | 1988-03-11 | Vorrichtung fuer optischen wellenlaengenmultiplexer. |
Country Status (5)
Country | Link |
---|---|
US (1) | US4923270A (de) |
EP (1) | EP0304462B1 (de) |
DE (1) | DE3872103T2 (de) |
GB (1) | GB2202404B (de) |
WO (1) | WO1988007216A1 (de) |
Families Citing this family (50)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2225482B (en) * | 1988-11-23 | 1992-10-14 | Stc Plc | Multichannel cavity laser |
WO1991001056A1 (en) * | 1989-07-06 | 1991-01-24 | Australian Electro Optics Pty. Ltd. | Segmented, fibre coupled diode laser arrays |
US5005934A (en) * | 1989-07-11 | 1991-04-09 | Galileo Electro-Optics Corporation | Fiber optics channel selection device |
GB2245096A (en) * | 1990-06-01 | 1991-12-18 | Gen Electric Co Plc | Semiconductor laser pump source |
US5245404A (en) * | 1990-10-18 | 1993-09-14 | Physical Optics Corportion | Raman sensor |
US5796096A (en) * | 1991-07-26 | 1998-08-18 | Accuwave Corporation | Fabrication and applications of long-lifetime, holographic gratings in photorefractive materials |
US5491570A (en) * | 1991-07-26 | 1996-02-13 | Accuwave Corporation | Methods and devices for using photorefractive materials at infrared wavelengths |
US5691989A (en) * | 1991-07-26 | 1997-11-25 | Accuwave Corporation | Wavelength stabilized laser sources using feedback from volume holograms |
AU2393892A (en) * | 1991-07-26 | 1993-03-02 | Accuwave Corporation | Photorefractive systems and methods |
US5335098A (en) * | 1991-07-26 | 1994-08-02 | Accuwave Corporation | Fixing method for narrow bandwidth volume holograms in photorefractive materials |
US5440669A (en) * | 1991-07-26 | 1995-08-08 | Accuwave Corporation | Photorefractive systems and methods |
SE501495C2 (sv) * | 1993-07-02 | 1995-02-27 | Ericsson Telefon Ab L M | Avstämbar optisk anordning |
US5488500A (en) * | 1994-08-31 | 1996-01-30 | At&T Corp. | Tunable add drop optical filtering method and apparatus |
JPH0964819A (ja) * | 1995-08-23 | 1997-03-07 | Fujitsu Ltd | 光システム |
US6130899A (en) * | 1996-12-12 | 2000-10-10 | Nortel Networks Corporation | Laser assembly |
US5978119A (en) * | 1997-02-18 | 1999-11-02 | Lucent Technologies Inc. | System and method for synchronizing an optical source and a router in a wavelength division multiplexed fiber optic network |
US6120190A (en) * | 1997-11-26 | 2000-09-19 | Lasertron, Inc. | Spatially variable bandpass filter monitoring and feedback control of laser wavelength especially in wavelength division multiplexing communication systems |
WO1999033152A1 (en) * | 1997-12-22 | 1999-07-01 | Northern Telecom Limited | Laser assembly |
FR2781613B1 (fr) | 1998-07-27 | 2000-10-06 | Photonetics | Laser en espace libre avec sortie fibre autoalignee |
CA2245389A1 (en) * | 1998-08-24 | 2000-02-24 | Ilya Golub | Multiplexer/demultiplexer for wdm optical signals |
US6327292B1 (en) | 1998-09-08 | 2001-12-04 | Massachusetts Institute Of Technology | External cavity laser source using spectral beam combining in two dimensions |
US6208679B1 (en) | 1998-09-08 | 2001-03-27 | Massachusetts Institute Of Technology | High-power multi-wavelength external cavity laser |
FR2786937B1 (fr) | 1998-12-04 | 2001-02-16 | Photonetics | Source multi-longueur d'onde |
JP3909969B2 (ja) * | 1998-12-09 | 2007-04-25 | 日本板硝子株式会社 | 光分波器 |
US6538817B1 (en) | 1999-10-25 | 2003-03-25 | Aculight Corporation | Method and apparatus for optical coherence tomography with a multispectral laser source |
US6456756B1 (en) | 1999-10-25 | 2002-09-24 | Aculight Corporation | Fiber raman amplifier pumped by an incoherently beam combined diode laser |
US6501782B1 (en) | 1999-10-25 | 2002-12-31 | Aculight Corporation | Compact laser apparatus |
US6501877B1 (en) * | 1999-11-16 | 2002-12-31 | Network Photonics, Inc. | Wavelength router |
US6529542B1 (en) | 2000-04-04 | 2003-03-04 | Aculight Corporation | Incoherent beam combined optical system utilizing a lens array |
US6707550B1 (en) | 2000-04-18 | 2004-03-16 | Pts Corporation | Wavelength monitor for WDM systems |
US6406193B1 (en) * | 2000-07-05 | 2002-06-18 | Intel Corporation | Fiber optic connector system |
US6556599B1 (en) | 2000-10-17 | 2003-04-29 | Bookham Technology Plc | External cavity laser using angle-tuned filter and method of making same |
US6901200B2 (en) | 2000-12-22 | 2005-05-31 | Fiber Optic Network Solutions, Inc. | Module and housing for optical fiber distribution and DWDM equipment |
US6570659B2 (en) | 2001-03-16 | 2003-05-27 | Lightlab Imaging, Llc | Broadband light source system and method and light source combiner |
US7623789B2 (en) * | 2001-04-11 | 2009-11-24 | Transmode Holding Ab | Low loss WDM add drop node |
US6665471B1 (en) | 2001-08-13 | 2003-12-16 | Nlight Photonics Corporation | System and method for optimizing the performance of multiple gain element laser |
US6657775B1 (en) | 2001-08-31 | 2003-12-02 | Nlight Photonics Corporation | System and method for providing a controlled linewidth external cavity laser |
US6836487B1 (en) | 2001-08-31 | 2004-12-28 | Nlight Photonics Corporation | Spectrally tailored raman pump laser |
US6663785B1 (en) | 2001-08-31 | 2003-12-16 | Nlight Photonics Corporation | Broad spectrum emitter array and methods for fabrication thereof |
US6907051B1 (en) | 2001-08-31 | 2005-06-14 | Nlight Photonics Corporation | Dynamically spectrally tailored raman pump laser |
JP3852409B2 (ja) * | 2003-02-04 | 2006-11-29 | 富士通株式会社 | 光機能デバイス |
US7265896B2 (en) * | 2004-12-17 | 2007-09-04 | Collinear Corporation | Optical power combining for optical frequency conversion having nonlinear feedback |
GB0623075D0 (en) | 2006-11-18 | 2006-12-27 | Ct For Integrated Photonics Th | Multiwavelength transmitter |
US9097580B2 (en) | 2010-07-26 | 2015-08-04 | Ii-Vi Incorporated | Multiport tunable optical filters |
US8755651B2 (en) | 2010-07-26 | 2014-06-17 | Oclaro (North America Inc.) | Tunable optical filters with multiple ports |
US8873905B2 (en) | 2010-07-26 | 2014-10-28 | Ii-Vi Incorporated | Reconfigurable optical add-drop multiplexer |
US8755652B2 (en) | 2010-07-26 | 2014-06-17 | Oclaro Technology Limited | Multi-channel optical signal monitoring device and method |
US8577192B2 (en) | 2010-07-26 | 2013-11-05 | Oclaro (North America Inc.) | Tunable optical filters with multiple ports |
DE102011003142A1 (de) * | 2011-01-26 | 2012-07-26 | Trumpf Laser Gmbh + Co. Kg | Diodenlaseranordnung mit dichter Wellenlängenkopplung |
CA2853431A1 (en) * | 2011-11-11 | 2013-05-16 | Lumenis Ltd. | Systems and methods for facilitating robotic surgical laser procedures |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1089932A (en) * | 1977-12-05 | 1980-11-18 | Norman Toms | Wavelength division multiplexer/demultiplexer in optical fiber communication systems |
WO1982001631A1 (en) * | 1980-10-23 | 1982-05-13 | Carter Andrew C | Optical transmission systems |
US4464759A (en) * | 1981-09-21 | 1984-08-07 | Massachusetts Institute Of Technology | Semiconductor diode laser system |
FR2524404B1 (fr) * | 1982-04-06 | 1986-10-31 | Mic | Plate-forme elevatrice, notamment pour vehicule industriel |
FR2525404A1 (fr) * | 1982-04-19 | 1983-10-21 | Instruments Sa | Dispositif de stabilisation de longueur d'onde d'une source laser a semi-conducteur |
GB8333054D0 (en) * | 1983-12-12 | 1984-01-18 | British Telecomm | Optical wavelength selector |
US4680767A (en) * | 1985-07-01 | 1987-07-14 | Polaroid Corporation | Optical fiber laser |
GB2178591B (en) * | 1985-07-25 | 1989-09-13 | Plessey Co Plc | Improvements relating to lasers |
US4730327A (en) * | 1985-12-16 | 1988-03-08 | Lytel Incorporated | Dual channel fabry-perot laser |
-
1987
- 1987-03-13 GB GB8706014A patent/GB2202404B/en not_active Expired - Fee Related
-
1988
- 1988-03-11 WO PCT/GB1988/000191 patent/WO1988007216A1/en active IP Right Grant
- 1988-03-11 EP EP88902183A patent/EP0304462B1/de not_active Expired - Lifetime
- 1988-03-11 US US07/269,913 patent/US4923270A/en not_active Expired - Lifetime
- 1988-03-11 DE DE8888902183T patent/DE3872103T2/de not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
WO1988007216A1 (en) | 1988-09-22 |
US4923270A (en) | 1990-05-08 |
EP0304462A1 (de) | 1989-03-01 |
GB8706014D0 (en) | 1987-04-15 |
DE3872103T2 (de) | 1993-01-07 |
EP0304462B1 (de) | 1992-06-17 |
GB2202404A (en) | 1988-09-21 |
GB2202404B (en) | 1991-01-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |