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首页> 外文期刊>Japanese Journal of Applied Physics. Part 1, Regular Papers, Brief Communications & Review Papers >Modulation Codes for Multi-wavelength and Multi-Level Photochromic Optical Recording Channel
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Modulation Codes for Multi-wavelength and Multi-Level Photochromic Optical Recording Channel

机译：多波长和多级光致变色光学记录通道的调制代码

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摘要

Multi-wavelength and multi-level optical recording with photochromic materials is a novel way to increase recording density and data transfer rate significantly. Modulation codes for multi-wavelength and multi-level recording channel are discussed. Firstly, two-dimensional (2-D) run-length-limited (RLL) (d_x, d_y, k; n) codes are introduced for multi-wavelength recording. An example of 2-D RLL(1,1,6; 2) code is shown to effectively combat the crosstalk in a two-wavelength recording model. Then, a DC-free four-ary RLL(2,8) code is designed with code rate of 8/10 (bits/symbol), and a partial-response maximum-likelihood (PRML) detector is used for the four-level RLL(2,8) modulation recording channel. We also introduce 2-D RLL(M, 1, ∞) codes for the joint multi-wavelength multi-level recording channel. Some numerical results on the capacities are derived, and an example of 2-D (5, 1,∞) code is constructed via state splitting algorithm. These proposed codes show great potential to be applicable in high-density 2-D and multi-level optical recording channels.
机译：用光致变色材料进行多波长和多级光学记录是一种显着提高记录密度和数据传输速率的新颖方法。讨论了用于多波长和多级记录通道的调制代码。首先，引入二维（2-D）行程限制（RLL）（d_x，d_y，k； n）码以进行多波长记录。显示了二维RLL（1,1,6; 2）代码的示例，可以有效地消除两波长记录模型中的串扰。然后，设计了无直流四进制RLL（2,8）码，其码率为8/10（位/符号），并将部分响应最大似然（PRML）检测器用于四级RLL（2,8）调制记录通道。我们还为联合多波长多级记录通道引入了二维RLL（M，1，∞）码。推导了一些关于容量的数值结果，并通过状态分离算法构造了一个二维（5，1，∞）码示例。这些提议的代码显示出巨大的潜力，可应用于高密度的二维和多层光学记录通道。

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