JPS6477984A - Distribution feedback type semiconductor laser - Google Patents

Distribution feedback type semiconductor laser

Info

Publication number
JPS6477984A
JPS6477984A JP62235525A JP23552587A JPS6477984A JP S6477984 A JPS6477984 A JP S6477984A JP 62235525 A JP62235525 A JP 62235525A JP 23552587 A JP23552587 A JP 23552587A JP S6477984 A JPS6477984 A JP S6477984A
Authority
JP
Japan
Prior art keywords
mode
corrugations
wavelength
periods
corrugation
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
JP62235525A
Other languages
Japanese (ja)
Inventor
Haruo Yonetani
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP62235525A priority Critical patent/JPS6477984A/en
Publication of JPS6477984A publication Critical patent/JPS6477984A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
    • H01S5/12—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region the resonator having a periodic structure, e.g. in distributed feedback [DFB] lasers
    • 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
    • H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
    • H01S5/12—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region the resonator having a periodic structure, e.g. in distributed feedback [DFB] lasers
    • H01S5/1206—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region the resonator having a periodic structure, e.g. in distributed feedback [DFB] lasers having a non constant or multiplicity of periods
    • H01S5/1215—Multiplicity of periods

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Semiconductor Lasers (AREA)

Abstract

PURPOSE:To make an oscillating mode to agree with a specified wavelength, by providing two corrugations having the different periods, and determining the periods of the corrugations so as to satisfy specified relation. CONSTITUTION:Corrugations having the periods of A1 and A2 are provided between upper and lower clad layers 2 and 6 holding an active layer 4 and an n-type guide layer 3 and a p-type guide layer 5. When the wavelength of a mode (+1) at the right of a wavelength lambdaB1 determined by the corrugation 1 agrees with the wavelength of a mode (-1) at the right of a wavelength lambdaB2 determined by the corrugation 2, there is relation of A1<-1>-A2<-1>=L<-1> between the periods A1 and A2 of both corrugations and a length L of a resonator. When the periods of two corrugations are determined as A1<A2 in order to satisfy said relation, the + first mode of the corrugation on the side A1 agrees with the - first mode on the side of A2. Since the oscillating threshold value of this mode is largely decreased, the single mode oscillation is implemented.
JP62235525A 1987-09-18 1987-09-18 Distribution feedback type semiconductor laser Pending JPS6477984A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62235525A JPS6477984A (en) 1987-09-18 1987-09-18 Distribution feedback type semiconductor laser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62235525A JPS6477984A (en) 1987-09-18 1987-09-18 Distribution feedback type semiconductor laser

Publications (1)

Publication Number Publication Date
JPS6477984A true JPS6477984A (en) 1989-03-23

Family

ID=16987267

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62235525A Pending JPS6477984A (en) 1987-09-18 1987-09-18 Distribution feedback type semiconductor laser

Country Status (1)

Country Link
JP (1) JPS6477984A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0507956A1 (en) * 1990-10-19 1992-10-14 Optical Measurement Technology Development Co. Ltd. Distributed feedback semiconductor laser

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0507956A1 (en) * 1990-10-19 1992-10-14 Optical Measurement Technology Development Co. Ltd. Distributed feedback semiconductor laser

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