JPS5727233A - Frequency modulation modulator - Google Patents

Frequency modulation modulator

Info

Publication number
JPS5727233A
JPS5727233A JP10226680A JP10226680A JPS5727233A JP S5727233 A JPS5727233 A JP S5727233A JP 10226680 A JP10226680 A JP 10226680A JP 10226680 A JP10226680 A JP 10226680A JP S5727233 A JPS5727233 A JP S5727233A
Authority
JP
Japan
Prior art keywords
light beam
frequency
led
optical
circuit part
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
JP10226680A
Other languages
Japanese (ja)
Other versions
JPH028294B2 (en
Inventor
Takeshi Koseki
Masaru Nakamura
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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.)
Filing date
Publication date
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP10226680A priority Critical patent/JPS5727233A/en
Publication of JPS5727233A publication Critical patent/JPS5727233A/en
Publication of JPH028294B2 publication Critical patent/JPH028294B2/ja
Granted 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
    • H04B10/60—Receivers

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To utilize a wide band property of an optical area without requiring a wide band in an electric circuit part, by modulating the frequency of a carrier laser (CL) beam by an electric signal, and transmitting it. CONSTITUTION:A high fine picture electric signal which is led into an input terminal 1 in a transmission side A is applied to CL oscillator 3 (center frequency fc) whose wave length is variable, through a driving electric circuit part 2, an optical FM signal is generated, and it is transmitted to a receiving side B through an optical fiber cabel 8 together with a pilot laser (PL) beam (frequency fp). The received light beam is synthesized with a light beam from a local laser (LL) oscillator 9 whose length is variable, and is led to an optical discriminator 13 having a frequency characteristic as shown in the figure M. Only the PL light beam and the LL light beam pass through 13, are led to a photodetector 13, are homodyne-detected, and an output ot the photdetector 14 is outputted as a demodulated electric signal to an output terminal 16 through a receiving circuit part 15.
JP10226680A 1980-07-25 1980-07-25 Frequency modulation modulator Granted JPS5727233A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10226680A JPS5727233A (en) 1980-07-25 1980-07-25 Frequency modulation modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10226680A JPS5727233A (en) 1980-07-25 1980-07-25 Frequency modulation modulator

Publications (2)

Publication Number Publication Date
JPS5727233A true JPS5727233A (en) 1982-02-13
JPH028294B2 JPH028294B2 (en) 1990-02-23

Family

ID=14322783

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10226680A Granted JPS5727233A (en) 1980-07-25 1980-07-25 Frequency modulation modulator

Country Status (1)

Country Link
JP (1) JPS5727233A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61267422A (en) * 1985-05-22 1986-11-27 Nec Corp Method for optical heterodyne detection communication

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54114005A (en) * 1978-02-24 1979-09-05 Nippon Telegr & Teleph Corp <Ntt> Optical communication system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54114005A (en) * 1978-02-24 1979-09-05 Nippon Telegr & Teleph Corp <Ntt> Optical communication system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61267422A (en) * 1985-05-22 1986-11-27 Nec Corp Method for optical heterodyne detection communication

Also Published As

Publication number Publication date
JPH028294B2 (en) 1990-02-23

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