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Optical oscillation device and recording apparatus

A technology for recording equipment and optics, applied in the field of recording equipment and optical oscillation devices, can solve the problems of increased cost and proportional increase of high-frequency superposition circuits, etc.

Inactive Publication Date: 2013-01-23
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method may lead to an increase in device size proportional to the added high-frequency superposition circuit, which may lead to an increase in cost

Method used

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  • Optical oscillation device and recording apparatus
  • Optical oscillation device and recording apparatus
  • Optical oscillation device and recording apparatus

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Experimental program
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no. 2 approach

[0132] 3. Second Embodiment (Example of Controlling Oscillation Frequency by DC Voltage During Oscillation)

[0133] In the first embodiment, the oscillation frequency of the self-excited oscillation semiconductor laser 1 is controlled using the value of the gain current during oscillation. However, if image 3 As shown, the oscillation frequency of the self-excited oscillation semiconductor laser 1 is also changed using the value of the reverse bias voltage. Hereinafter, a recording apparatus that uses a reverse bias to control the oscillation frequency of the self-excited oscillation semiconductor laser 1 will be described.

[0134] Figure 12 is a schematic diagram showing the configuration of the recording apparatus 200 according to the second embodiment. For the units corresponding to the units of the first embodiment (see Figure 11 ) use the same reference numerals, and their description will not be repeated.

[0135] The recording apparatus 200 according to this e...

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Abstract

Provided is a recording apparatus including a self-excited oscillation semiconductor laser that has a double quantum well separate confinement heterostructure and includes a saturable absorber section to which a negative bias voltage is applied and a gain section into which a gain current is injected, an optical separation unit, an objective lens, a light reception element, a pulse detection unit, a reference signal generation unit, a phase comparison unit, a recording signal generation unit, and a control unit.

Description

technical field [0001] The present invention relates to an optical oscillation device emitting laser light and a recording apparatus using the same. Background technique [0002] In recent years, with the development of information technology (IT) in society, larger capacity and higher speed communication are necessary. Therefore, as for the medium used to propagate information, not only the optical communication technology of radio waves with frequencies such as 2.4GHz band and 5GHz band in radio communication but also the band with wavelengths such as 1.5μm (up to hundreds of THz frequencies) are used The optical communication technology of light has rapidly entered into widespread use. [0003] For example, a method of transmitting information by light is used not only for optical communication such as optical fiber communication, but also for recording and reproducing information on / from a recording medium. Therefore, optical information technology will become an impor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/127G11B7/126G11B7/13H01S5/042
CPCH01S5/0658H01S5/34333H01S5/0602G11B7/126G11B2007/00457H01S5/06255G11B7/127B82Y20/00G11B7/1275G11B7/128H01S5/0261H01S5/06253
Inventor 藤田五郎丸山务仓本大渡边秀辉
Owner SONY CORP