Useful laser source criteria for optical storage employing extended eye-diagram jitter theory

Shigeo Kubota; Michio Oka; Naoya Eguchi; Atsushi Fukumoto; Yoshiyuki Akiyama

doi:10.1364/AO.34.001245

Applied Optics
Vol. 34,
Issue 7,
pp. 1245-1253
(1995)
•https://doi.org/10.1364/AO.34.001245

Useful laser source criteria for optical storage employing extended eye-diagram jitter theory

Shigeo Kubota, Michio Oka, Naoya Eguchi, Atsushi Fukumoto, and Yoshiyuki Akiyama

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Shigeo Kubota, Michio Oka, Naoya Eguchi, Atsushi Fukumoto, and Yoshiyuki Akiyama, "Useful laser source criteria for optical storage employing extended eye-diagram jitter theory," Appl. Opt. 34, 1245-1253 (1995)

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Abstract

In view of the recent progress in visible lasers for next-generation optical disks, we describe the influence of source wavelength, aberration, and noise on eye-diagram jitter, which determines the ultimate disk density. The analysis indicates that the sources used in a readout of a 6× areal density, (4,22) run-length-limited code with a minimum mark length of 0.4 μm must have a wavelength that satisfies the Nyquist condition of relationship between the spot size and the minimum mark length, a wave-front aberration of less than 0.035 rms λ, and relative intensity noise of less than −125 dB/Hz.

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Parameter λ (readout wavelength)	VFM (4,22) RLL code 532 nm	EFM (2,10) RLL code 780 nm
NA	0.6	0.45
λ/NA (spot size)	0.89 μm	1.73 μm
Track pitch	0.8 μm	1.6 μm
ν (disk-rotation speed)	4.8 m/s	1.25 m/s
T_min (packing-density ratio)	2 data bits	1.41 data bits
T _w (timing window)	0.4 data bit	0.47 data bit
L (minimum mark length in space)	0.4 μm	0.87 μm
τ_min (minimum mark length in time)	83.3 ns	694 ns
τ _w (window length in time)	16.7 ns	231 ns
Linear bit density	5 bits/μm	1.6 bits/μm
Areal bit density	6.25 bits/μm2	1 bit/μm2

Parameter Wavelength (λ)	Criteria λ/NA < 2.2 (minimum mark length)
Wave-front aberration	<0.035 rms λ
RIN	< −125 dB/Hz in the readout of a ROM disk
Power	High enough power to ensure shot-noise-limited detection of a MO signal and to obtain CNR > 45 dB in the readout of the minimum mark length of the code

Parameter λ (readout wavelength)	VFM (4,22) RLL code 532 nm	EFM (2,10) RLL code 780 nm
NA	0.6	0.45
λ/NA (spot size)	0.89 μm	1.73 μm
Track pitch	0.8 μm	1.6 μm
ν (disk-rotation speed)	4.8 m/s	1.25 m/s
T_min (packing-density ratio)	2 data bits	1.41 data bits
T _w (timing window)	0.4 data bit	0.47 data bit
L (minimum mark length in space)	0.4 μm	0.87 μm
τ_min (minimum mark length in time)	83.3 ns	694 ns
τ _w (window length in time)	16.7 ns	231 ns
Linear bit density	5 bits/μm	1.6 bits/μm
Areal bit density	6.25 bits/μm2	1 bit/μm2

Parameter Wavelength (λ)	Criteria λ/NA < 2.2 (minimum mark length)
Wave-front aberration	<0.035 rms λ
RIN	< −125 dB/Hz in the readout of a ROM disk
Power	High enough power to ensure shot-noise-limited detection of a MO signal and to obtain CNR > 45 dB in the readout of the minimum mark length of the code

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Applied Optics