Controlling method for write pulse waveform of high-density optical recording

• Main Authors: JIN-GYO SEO, SUNG-RO KO, SEONG-SIN JOO, KYUNG-GEUN LEE, CHANG-JIN YANG, JONG-KYU KIM, MYUNG-DO ROH, TATSUHIRO OHSTUKA, YONG-JIN AHN, MYEONG-HO CHO, DU-SEOP YOON, SEOUNG-SOO KIM
• Format: Patent
• Language: English
• Published: 03.12.2004
• Edition: 7
• Subjects: INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS

An adaptive writing method for a high-density optical recording apparatus and a circuit thereof are provided. The circuit includes a discriminator (102) for discriminating the magnitude of the present mark of the input data and the magnitudes of the leading and/or trailing spaces, a generator (104,108) for controlling the waveform of the write pulse in accordance with the magnitude of the present mark of the input data and the magnitudes of the leading and/or trailing spaces to generate an adaptive write pulse, and a driver (110) for driving the light source by converting the adaptive write pulse into a current signal in accordance with driving power levels for the respective channels. The widths of the first and/or last pulses of a write pulse waveform are varied in accordance with the magnitude of the present mark of input NRZI data and the magnitude of the leading and/or trailing spaces, thereby minimizing jitter to enhance system reliability and performance.