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公开(公告)号:US20050105574A1
公开(公告)日:2005-05-19
申请号:US10713380
申请日:2003-11-14
申请人: Xin Wu , Allen Earman , Yen-Ping Ho
发明人: Xin Wu , Allen Earman , Yen-Ping Ho
IPC分类号: H01S3/00 , H01S5/042 , H01S5/0683
CPC分类号: H01S5/042 , H01S5/0683
摘要: A transistor, such as a FET or bipolar transistor, may be gate or base coupled to a laser driver output stage to receive a varying voltage from a driver output stage. The transistor converts the varying voltage to a varying current. The transistor, in series with the laser, may be coupled to a supply voltage on one side and ground on the other side. Thus, the current supplied to the laser diode is a function of the drive supplied to the transistor's base or gate.
摘要翻译: 诸如FET或双极晶体管的晶体管可以是栅极或基极耦合到激光驱动器输出级,以从驱动器输出级接收变化的电压。 晶体管将变化的电压转换为变化的电流。 与激光器串联的晶体管可以耦合到一侧的电源电压并且在另一侧上被接地。 因此,提供给激光二极管的电流是提供给晶体管的基极或栅极的驱动的函数。
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公开(公告)号:US5781130A
公开(公告)日:1998-07-14
申请号:US440557
申请日:1995-05-12
CPC分类号: G11B20/1496 , H03M5/20 , H04L25/4917
摘要: A system for encoding digital data with an M-ary (d,k) code to provide multi-level coded data where M>2 comprises an M-ary (d,k) encoder for accepting digital input data. The M-ary (d,k) coder encodes the digital input data to produce a plurality of code symbols, where each code symbol is at one of M levels and each pair of non-zero code symbols is separated by at least d but no more than k zeros. A waveform encoder converts the code symbols into waveform signal amplitudes compatible with a multi-level channel. Each waveform signal amplitude is generated by modulo M addition of a current code symbol with a previous waveform signal amplitude. A specific M-ary (d,k) code provides high density recording to a multi-level storage medium. The M-ary (d,k) encoder is implemented using a M-state encoder and a modulo M waveform encoder.
摘要翻译: 一种用M-ary(d,k)码编码数字数据以提供多级编码数据的系统,其中M> 2包括用于接受数字输入数据的M-ary(d,k)编码器。 M-ary(d,k)编码器对数字输入数据进行编码以产生多个码符号,其中每个码符号处于M个电平中的一个,并且每对非零码符号分开至少d但不分 多于k个零。 波形编码器将码符号转换为与多电平信道兼容的波形信号幅度。 每个波形信号幅度通过具有先前波形信号振幅的当前码元的模M相加产生。 特定的M-ary(d,k)码向多级存储介质提供高密度记录。 M-ary(d,k)编码器使用M状态编码器和模M波形编码器实现。
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