JPS6456426A - Optical a/d converter - Google Patents

Optical a/d converter

Info

Publication number
JPS6456426A
JPS6456426A JP25107787A JP25107787A JPS6456426A JP S6456426 A JPS6456426 A JP S6456426A JP 25107787 A JP25107787 A JP 25107787A JP 25107787 A JP25107787 A JP 25107787A JP S6456426 A JPS6456426 A JP S6456426A
Authority
JP
Japan
Prior art keywords
intensity
light
threshold level
input
light beam
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.)
Granted
Application number
JP25107787A
Other languages
Japanese (ja)
Other versions
JP2564852B2 (en
Inventor
Hajime Sakata
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP62251077A priority Critical patent/JP2564852B2/en
Priority to US07/195,950 priority patent/US4926177A/en
Publication of JPS6456426A publication Critical patent/JPS6456426A/en
Application granted granted Critical
Publication of JP2564852B2 publication Critical patent/JP2564852B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE:To efficiently execute a high speed processing even in case of multicolor image information, by outputting simultaneously a first output light beam consisting of a digital signal, and a light beam being proportional to the input light intensity when the input light beam is below a threshold level, and being proportional to the light intensity which has subtracted the threshold level from the input light intensity when the input light is the threshold level or above, based on the threshold level as a reference. CONSTITUTION:A non-linear optical element 12 has a prescribed threshold level, and when the intensity I of an input light is a threshold value It or below, said element outputs a light beam of the intensity I0 corresponding to a digital signal for signifying a digit '0' as a first output light T, and a light beam of the intensity IR0 being proportional to the intensity of the input light as a second output light R, respectively. Also, when the intensity I of the input light is the threshold level It or above, the light beam of the intensity I1 corresponding to a digital signal for signifying a digit '1', and the light beam of the intensity IR1 being proportional to the light intensity which has subtracted the threshold level from the input light intensity I are outputted as the first output light T, and the second output light R, respectively. In such a way, information extending from an input to an output is all processed by light and brought to A/D conversion. Thus, an optical A/D converter of high speed and high accuracy can be attained.
JP62251077A 1987-05-21 1987-10-05 Optical AD converter Expired - Fee Related JP2564852B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP62251077A JP2564852B2 (en) 1987-05-21 1987-10-05 Optical AD converter
US07/195,950 US4926177A (en) 1987-05-21 1988-05-19 Optical analog-digital converter provided with a nonlinear optical element and an optical feedback system for the output lights of said element

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP12438087 1987-05-21
JP62-124380 1987-05-21
JP62251077A JP2564852B2 (en) 1987-05-21 1987-10-05 Optical AD converter

Publications (2)

Publication Number Publication Date
JPS6456426A true JPS6456426A (en) 1989-03-03
JP2564852B2 JP2564852B2 (en) 1996-12-18

Family

ID=26461066

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62251077A Expired - Fee Related JP2564852B2 (en) 1987-05-21 1987-10-05 Optical AD converter

Country Status (1)

Country Link
JP (1) JP2564852B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8922410B2 (en) 2010-05-19 2014-12-30 Nec Corporation Optical intensity-to-phase converter, mach-zehnder interferometer, optical A/D converter, and method of constructing optical intensity-to-phase converter
US8941519B2 (en) 2010-12-01 2015-01-27 Nec Corporation Light intensity subtractor, optical A-D converter, and method for subtracting light intensity
US9052534B2 (en) 2010-05-19 2015-06-09 Nec Corporation Optical analog-to-digital converter, method of constructing the same, optical signal demodulator, and optical modulator-demodulator
US9091593B2 (en) 2010-08-09 2015-07-28 Nec Corporation Optical intensity determination unit, method of forming the same, and optical A/D converter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8922410B2 (en) 2010-05-19 2014-12-30 Nec Corporation Optical intensity-to-phase converter, mach-zehnder interferometer, optical A/D converter, and method of constructing optical intensity-to-phase converter
US9052534B2 (en) 2010-05-19 2015-06-09 Nec Corporation Optical analog-to-digital converter, method of constructing the same, optical signal demodulator, and optical modulator-demodulator
US9091593B2 (en) 2010-08-09 2015-07-28 Nec Corporation Optical intensity determination unit, method of forming the same, and optical A/D converter
US8941519B2 (en) 2010-12-01 2015-01-27 Nec Corporation Light intensity subtractor, optical A-D converter, and method for subtracting light intensity

Also Published As

Publication number Publication date
JP2564852B2 (en) 1996-12-18

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees