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    Current boost profile applied to laser during heat-assisted magnetic recording
    21.
    发明授权
    Current boost profile applied to laser during heat-assisted magnetic recording 有权
    在热辅助磁记录中应用于激光的电流增强曲线

    公开(公告)号：US09202506B1

    公开(公告)日：2015-12-01

    申请号：US14595740

    申请日：2015-01-13

    Applicant: Seagate Technology LLC

    Inventor： Drew Michael Mader ,  Alfredo Sam Chu ,  Jason Riddering

    IPC: G11B7/1263 ,  G11B5/31 ,  G11B5/48 ,  G11B5/60 ,  G11B5/00

    CPC classification number: G11B7/1263 ,  G11B5/3133 ,  G11B5/314 ,  G11B5/4866 ,  G11B5/6088 ,  G11B2005/0021

    Abstract: A power level is applied to a laser that heats a heat-assisted recording medium is increased during recording for a plurality of iterations. Each iteration involves writing test data to a plurality of sequential tracks of the recording medium using the power level and determining bit error rates of the test data. Based on the bit error rates of the iterations, a power boost profile is determined. The power boost profile starts at a baseline level at a first track of a plurality of sequentially-written tracks, incrementally increases to a steady-state level over a first portion of the tracks, and remains at the steady-state level over subsequent ones of the tracks. The power boost profile is applied to the laser when recording to the recording medium.

    Abstract translation: 对于在多次迭代的记录期间加热热辅助记录介质的激光器施加功率电平。 每次迭代涉及使用功率电平将测试数据写入记录介质的多个顺序轨道并确定测试数据的误码率。 基于迭代的误码率，确定功率提升曲线。 功率提升曲线在多个顺序写入的轨道的第一轨道处的基线水平处开始，在轨道的第一部分上递增地增加到稳态水平，并且在随后的轨迹中保持在稳态水平 轨道。 当记录到记录介质时，功率提升曲线被应用于激光器。

    Laser bias current control
    25.
    发明授权
    Laser bias current control 有权

    公开(公告)号：US09916850B1

    公开(公告)日：2018-03-13

    申请号：US15375368

    申请日：2016-12-12

    Applicant: Seagate Technology LLC

    Inventor： Alfredo Sam Chu ,  Robert Matousek ,  Todd Michael Lammers ,  Thomas Lee Schick ,  Wenzhong Zhu

    IPC: G11B5/02 ,  G11B5/00 ,  G11B7/1263

    CPC classification number: G11B5/012 ,  G11B5/314 ,  G11B2005/0021

    Abstract: A preamplifier circuit can include a control line dedicated to receive a control signal that corresponds to indicating a specific register of the preamplifier circuit, which can allow the preamplifier to switch between utilizing two or more registers to control a current output of the preamplifier circuit. The preamplifier circuit may also have a serial input to program multiple registers of the preamplifier circuit in a serial fashion. In some embodiments, the current output may be a laser bias current. The preamplifier may adjust an output current that drives a laser emitter based on a control signal indicating which specific registers controls the output current. Further, a controller, such as a system-on-chip controller, may selectively vary the control signal to affect the current output of the preamplifier circuit. These systems and methods may be particularly useful for lasers and heat-assisted magnetic recording (HAMR).

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