GB1220486A – Digital optical modulator
– Google Patents
GB1220486A – Digital optical modulator
– Google Patents
Digital optical modulator
Info
Publication number
GB1220486A
GB1220486A
GB8909/68A
GB890968A
GB1220486A
GB 1220486 A
GB1220486 A
GB 1220486A
GB 8909/68 A
GB8909/68 A
GB 8909/68A
GB 890968 A
GB890968 A
GB 890968A
GB 1220486 A
GB1220486 A
GB 1220486A
Authority
GB
United Kingdom
Prior art keywords
optic
cells
modulators
electro
modulator
Prior art date
1967-02-25
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
Application number
GB8909/68A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
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.)
1967-02-25
Filing date
1968-02-23
Publication date
1971-01-27
1968-02-23
Application filed by Philips Electronic and Associated Industries Ltd
filed
Critical
Philips Electronic and Associated Industries Ltd
1971-01-27
Publication of GB1220486A
publication
Critical
patent/GB1220486A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03K—PULSE TECHNIQUE
H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
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
G02F1/03—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 based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
G02F1/0327—Operation of the cell; Circuit arrangements
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
G02F1/29—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 position or the direction of light beams, i.e. deflection
G02F1/31—Digital deflection, i.e. optical switching
Abstract
1,220,486. Light modulators. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 23 Feb., 1968 [25 Feb., 1967], No. 8909/68. Heading H4F. A digital electro-optic or magneto-optic modulation arrangement comprises at least two separate modulators of different construction and/or different electric or magnetic operating characteristics which are successively passed by the radiation to be modulated, each modulator being individually switchable between two operating points in which the electro-optic or magneto-optic material is subject to different electric or magnetic field strengths. The modulators may comprise Kerr or Pockels cells in which the electro-optic material is nitrobenzene, KDP or KTN, the length of the cells, the spacing of the electrodes of the cells, the voltages applied to the cells, or the lengths and voltages of the cells being varied from cell to cell (Figs. 2-4, not shown). Different lengths of magnetooptic material e.g. YIG, may be subjected to a magnetic field (Figs. 5, not shown). To obtain a more homogeneous polarization of the electrooptic material, dielectric plates of material having a small dielectric constant compared to the dielectric constant of the electro-optic material are interposed between adjacent modulators the refractive index of the two materials being substantially equal (Fig. 8, not shown). To produce a system in which the intensity of a radiation beam may be varied in logarithmically equidistant steps, the dielectric plates of Fig. 8 are arranged to comprise plane polarizers or are replaced by plane polarizers (e.g. Nicol prisms or multilayer dielectrics one layer of which comprises a plane polarizer) having the same direction of polarization (Fig. 9, not shown), the direction of polarization being preferably at 45 degrees to the direction of the electric field in the modulators. Each modulator thus changes the intensity of the radiation beam by a factor F i which is less than one. The resulting intensity of the beam after passage through the entire modulator thus equals I = I 0 F 1 F 2 F 3 . . . F n or 1nI= 1nI 0 + 1 n F 1 + 1nF 2 + …. A binary system having logarithmically equidistant stages is obtained, for example, by making F 1 = 0À5, F 2 = 0À5
GB8909/68A
1967-02-25
1968-02-23
Digital optical modulator
Expired
GB1220486A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
DEP0041495
1967-02-25
Publications (1)
Publication Number
Publication Date
GB1220486A
true
GB1220486A
(en)
1971-01-27
Family
ID=7377880
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB8909/68A
Expired
GB1220486A
(en)
1967-02-25
1968-02-23
Digital optical modulator
Country Status (5)
Country
Link
US
(1)
US3588749A
(en)
DE
(1)
DE1614329B2
(en)
FR
(1)
FR1557234A
(en)
GB
(1)
GB1220486A
(en)
NL
(1)
NL6802432A
(en)
Families Citing this family (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4789843A
(en)
*
1987-07-28
1988-12-06
Hicks John W
Laser diode optical modulating devices
US5227912A
(en)
*
1991-10-30
1993-07-13
Ho Ping Pei
Multiple-stage optical kerr gate system
US6963677B1
(en)
*
2003-11-25
2005-11-08
Lockheed Martin Corp.
Optical memory and logic using cross-switches
1967
1967-02-25
DE
DE1614329A
patent/DE1614329B2/en
not_active
Withdrawn
1968
1968-02-20
NL
NL6802432A
patent/NL6802432A/xx
unknown
1968-02-23
GB
GB8909/68A
patent/GB1220486A/en
not_active
Expired
1968-02-26
US
US708278A
patent/US3588749A/en
not_active
Expired – Lifetime
1968-02-26
FR
FR1557234D
patent/FR1557234A/fr
not_active
Expired
Also Published As
Publication number
Publication date
DE1614329B2
(en)
1974-01-03
DE1614329A1
(en)
1970-07-02
US3588749A
(en)
1971-06-28
FR1557234A
(en)
1969-02-14
NL6802432A
(en)
1968-08-26
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Legal Events
Date
Code
Title
Description
1971-06-09
PS
Patent sealed [section 19, patents act 1949]
1980-10-08
PCNP
Patent ceased through non-payment of renewal fee
