Invention Grant
- Patent Title: Setting laser current based on modulation level of an optical power sensor measurement
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Application No.: US15333761Application Date: 2016-10-25
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Publication No.: US09741386B1Publication Date: 2017-08-22
- Inventor: Tim Rausch , Edward Charles Gage , Joshua Ward Christensen , Todd Michael Lammers
- Applicant: Seagate Technology LLC
- Applicant Address: US CA Cupertino
- Assignee: SEAGATE TECHNOLOGY LLC
- Current Assignee: SEAGATE TECHNOLOGY LLC
- Current Assignee Address: US CA Cupertino
- Agency: Hollingsworth Davis, LLC
- Main IPC: G11B5/02
- IPC: G11B5/02 ; G11B7/00 ; G11B7/1263 ; H01S5/042 ; H01S5/0683 ; G11B5/012 ; G11B5/00

Abstract:
Before writing to a heat-assisted magnetic recording medium, a current of a laser is modulated about a default threshold current level. A modulation level of an optical power sensor is measured, the optical power sensor being coupled to detect optical output of the laser in response to the modulated current. A bias current for subsequent activation of the laser is adjusted based on the modulation level of the optical power sensor.
Public/Granted literature
- US3109573A Tape guide apparatus for magnetic tape transports Public/Granted day:1963-11-05
Information query
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