JPS6471337A - Optical transmission system - Google Patents

Optical transmission system

Info

Publication number
JPS6471337A
JPS6471337A JP62228988A JP22898887A JPS6471337A JP S6471337 A JPS6471337 A JP S6471337A JP 62228988 A JP62228988 A JP 62228988A JP 22898887 A JP22898887 A JP 22898887A JP S6471337 A JPS6471337 A JP S6471337A
Authority
JP
Japan
Prior art keywords
modulation
pfm
circuit
converted
signal
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
JP62228988A
Other languages
Japanese (ja)
Other versions
JP2751162B2 (en
Inventor
Michiyuki Takemata
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
Priority to JP62228988A priority Critical patent/JP2751162B2/en
Publication of JPS6471337A publication Critical patent/JPS6471337A/en
Application granted granted Critical
Publication of JP2751162B2 publication Critical patent/JP2751162B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE:To obtain large S/N while keeping a low distortion characteristic by combin ing a PFM modulation circuit applying pre-modulation by a small modulation and a PFM modulation circuit applying pre-modulation with a large modulation. CONSTITUTION:An input signal 12 is converted into a pulse frequency modulation wave 13 by a 1st PFM modulation circuit 2. The modulation circuit 2 emphasizes a low distortion characteristic to apply pre-modulation by a small modulation. A pulse modulation wave 13 is converted into a pulse frequency modulation wave 14 by a 2nd PFM modulation circuit 3. The modulation circuit 3 emphasizes the S/N characteristic to apply pre-modulation by a large modulation. The modulation wave 14 is converted into an optical signal and sent to the optical fiber 6. On the other hand, the optical signal from the optical fiber 6 is converted into an electric signal at the reception side and its output 15 is modulated by the 2nd PFM demodulation circuit 9 corresponding to the 2nd PFM modulation circuit 3 and the signal is demodulated into the original signal by the 1st PFM demodulation circuit corresponding to the 1st PFM modulation circuit 2. Moreover, the 2nd PFM modulation circuit and the PFM demodulation circuit are replaced into FSK modulation and demodulation circuits.
JP62228988A 1987-09-11 1987-09-11 Optical transmission system Expired - Lifetime JP2751162B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62228988A JP2751162B2 (en) 1987-09-11 1987-09-11 Optical transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62228988A JP2751162B2 (en) 1987-09-11 1987-09-11 Optical transmission system

Publications (2)

Publication Number Publication Date
JPS6471337A true JPS6471337A (en) 1989-03-16
JP2751162B2 JP2751162B2 (en) 1998-05-18

Family

ID=16885007

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62228988A Expired - Lifetime JP2751162B2 (en) 1987-09-11 1987-09-11 Optical transmission system

Country Status (1)

Country Link
JP (1) JP2751162B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06291727A (en) * 1992-05-29 1994-10-18 Matsushita Electric Ind Co Ltd Pulse forming analog optical transmission system
US5663824A (en) * 1993-11-02 1997-09-02 Lucent Technologies Inc. Optical modulators as monolithically integrated optical isolators

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61198935A (en) * 1985-02-28 1986-09-03 Toshiba Corp Optical transmission system
JPS6267937A (en) * 1985-09-19 1987-03-27 Hitachi Cable Ltd Pulse analog optical communication system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61198935A (en) * 1985-02-28 1986-09-03 Toshiba Corp Optical transmission system
JPS6267937A (en) * 1985-09-19 1987-03-27 Hitachi Cable Ltd Pulse analog optical communication system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06291727A (en) * 1992-05-29 1994-10-18 Matsushita Electric Ind Co Ltd Pulse forming analog optical transmission system
US5663824A (en) * 1993-11-02 1997-09-02 Lucent Technologies Inc. Optical modulators as monolithically integrated optical isolators

Also Published As

Publication number Publication date
JP2751162B2 (en) 1998-05-18

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