GB2340617B - Variable wavelength filter device and control method of variable wavelength filter - Google Patents

Variable wavelength filter device and control method of variable wavelength filter

Info

Publication number
GB2340617B
GB2340617B GB9918645A GB9918645A GB2340617B GB 2340617 B GB2340617 B GB 2340617B GB 9918645 A GB9918645 A GB 9918645A GB 9918645 A GB9918645 A GB 9918645A GB 2340617 B GB2340617 B GB 2340617B
Authority
GB
United Kingdom
Prior art keywords
wavelength filter
variable wavelength
control method
filter device
variable
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
Application number
GB9918645A
Other versions
GB2340617A (en
GB9918645D0 (en
Inventor
Takahiro Shiozawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Publication of GB9918645D0 publication Critical patent/GB9918645D0/en
Publication of GB2340617A publication Critical patent/GB2340617A/en
Application granted granted Critical
Publication of GB2340617B publication Critical patent/GB2340617B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/293—Signal power control
    • H04B10/294—Signal power control in a multiwavelength system, e.g. gain equalisation
    • H04B10/2941—Signal power control in a multiwavelength system, e.g. gain equalisation using an equalising unit, e.g. a filter
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
    • G02F1/0123—Circuits for the control or stabilisation of the bias voltage, e.g. automatic bias control [ABC] feedback loops
    • 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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
    • H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Plasma & Fusion (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Communication System (AREA)
GB9918645A 1998-08-07 1999-08-06 Variable wavelength filter device and control method of variable wavelength filter Expired - Fee Related GB2340617B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10223973A JP2943802B1 (en) 1998-08-07 1998-08-07 Variable wavelength filter device and variable wavelength filter control method

Publications (3)

Publication Number Publication Date
GB9918645D0 GB9918645D0 (en) 1999-10-13
GB2340617A GB2340617A (en) 2000-02-23
GB2340617B true GB2340617B (en) 2001-03-07

Family

ID=16806589

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9918645A Expired - Fee Related GB2340617B (en) 1998-08-07 1999-08-06 Variable wavelength filter device and control method of variable wavelength filter

Country Status (2)

Country Link
JP (1) JP2943802B1 (en)
GB (1) GB2340617B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4789847B2 (en) * 2007-04-18 2011-10-12 日本電信電話株式会社 Optical receiver and method for stabilizing operating point of optical interferometer used therefor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0857994A2 (en) * 1997-01-10 1998-08-12 Gpt Limited Method and apparatus for operating an optical modulator
US5933262A (en) * 1996-04-23 1999-08-03 Nec Corporation Optical amplification device and wavelength multiplexed light transfer apparatus using the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5933262A (en) * 1996-04-23 1999-08-03 Nec Corporation Optical amplification device and wavelength multiplexed light transfer apparatus using the same
EP0857994A2 (en) * 1997-01-10 1998-08-12 Gpt Limited Method and apparatus for operating an optical modulator

Also Published As

Publication number Publication date
JP2000059310A (en) 2000-02-25
GB2340617A (en) 2000-02-23
GB9918645D0 (en) 1999-10-13
JP2943802B1 (en) 1999-08-30

Similar Documents

Publication Publication Date Title
GB9702077D0 (en) Filter and method of making an optical device
GB2321816B (en) Loop filter and loop filtering method
GB2339946B (en) System and method of filtering
GB2286304B (en) Ladder filter and method
GB9419757D0 (en) Wavelength selective filter and laser including it
HK1039887A1 (en) Footcare device and method of using same
EP0922329A4 (en) Elliptic filter and method of making the same
GB2333377B (en) Engine control apparatus and method
HK1028818A1 (en) Time-measurement device and method of controlling the same
AU5381399A (en) Hair treatment device and method
IL135301A0 (en) Filter material construction and method
IL138365A0 (en) Communication device and method of operation
GB2323229B (en) Digital filter bank device structure and the method of operating the same
AU1183199A (en) Filter device and filtering process
GB9809448D0 (en) Treatment device and method
DE69721913D1 (en) FILTER METHOD AND RELATED FILTER SYSTEM
GB2314031B (en) Fluid filter element and method of manufacture
AU3792697A (en) Water treatment device and method
AU2648599A (en) Methods and apparatus for controlling filter adaption in noise
GB2340617B (en) Variable wavelength filter device and control method of variable wavelength filter
HK1041246A1 (en) Variable-speed moving sidewalk and method of designing it
NO962055D0 (en) Device and method of controlling functions
GB9523718D0 (en) Filter and filter element
GB9602944D0 (en) Structures for filters and/or resonators
AU6010998A (en) Method and device for the continuous cooking of pulp

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20130806