JPS4943823B1 - - Google Patents

Info

Publication number
JPS4943823B1
JPS4943823B1 JP2465664A JP2465664A JPS4943823B1 JP S4943823 B1 JPS4943823 B1 JP S4943823B1 JP 2465664 A JP2465664 A JP 2465664A JP 2465664 A JP2465664 A JP 2465664A JP S4943823 B1 JPS4943823 B1 JP S4943823B1
Authority
JP
Japan
Prior art keywords
pulse
input signal
diode
transistor
modulated
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.)
Pending
Application number
JP2465664A
Other languages
Japanese (ja)
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 filed Critical
Publication of JPS4943823B1 publication Critical patent/JPS4943823B1/ja
Pending 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
    • H04B10/50—Transmitters
    • 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
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/062—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
    • H01S5/06209—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes in single-section lasers
    • H01S5/06216—Pulse modulation or generation

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Semiconductor Lasers (AREA)
  • Optical Communication System (AREA)

Abstract

1,044,992. Lasers; pulse modulation systems. INTERNATIONAL BUSINESS MACHINES CORPORATION. May 14, 1964 [May 17, 1963], No. 20096/64. Headings H3B and H4L. A pulse modulated carrier wave transmitter comprises a semi-conductor laser the input current of which is pulse-modulated in accordance with the amplitude of an input signal. An audio input signal applied to terminal 30 and amplified by transistor T1 is applied to the base of transistor T2 so that the current on line 34 is modulated in accordance with the audiomodulated input signal. The capacitors of L-C delay line 36 are charged by the modulated current on line 34 until the voltage across PNPN diode 40 is sufficient to cause this diode to break down and a pulse to be passed to semi-conductor laser diode 42 so as to switch the diode to its lasing condition. At the end of the output pulse on line 41 the PNPN diode 40 is switched back to its high impedance state by feeding a positive pulse to the base of transistor T2 to reduce the emitter/collector current of transistor T1 to zero and hence also the current flowing through diode 40. After restoration of the switch 40 the capacitors of delay line 36 begin to recharge through the transistor T2 so that a PFM signal corresponding in information content to the audio modulated input signal is generated on line 41. The radiation output from the laser is thus an optical PFM signal embodying the information carried on the audio input signal. The amplitude characteristics of the input signal correspond to the pulse repetition rate of the PFM signal and frequency characteristics of the input signal are embodied as the rate of change of the pulse repetition rate. The laser may be a gallium-arsenide diode.
JP2465664A 1963-05-17 1964-05-01 Pending JPS4943823B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US28115663A 1963-05-17 1963-05-17

Publications (1)

Publication Number Publication Date
JPS4943823B1 true JPS4943823B1 (en) 1974-11-25

Family

ID=23076170

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2465664A Pending JPS4943823B1 (en) 1963-05-17 1964-05-01

Country Status (5)

Country Link
JP (1) JPS4943823B1 (en)
CH (1) CH422595A (en)
DE (1) DE1185721B (en)
ES (1) ES299861A1 (en)
GB (1) GB1044992A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5036125U (en) * 1973-07-28 1975-04-16

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2446632A (en) * 2007-02-13 2008-08-20 David Holmes Transmission of audio signals over a fibre optic cable using pulse width modulation or pulse density modulation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5036125U (en) * 1973-07-28 1975-04-16

Also Published As

Publication number Publication date
GB1044992A (en) 1966-10-05
ES299861A1 (en) 1964-11-01
CH422595A (en) 1966-10-15
DE1185721B (en) 1965-01-21

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