[1] Shen Zhaolong,Jiang Bing,Cai Jianwen et al.. Synchronizing focus error detection of dual-pickup in multi-layer data storage system [J]. Acta Optica Sinica,2007,27(4):685-689

[2] Cai Jianwen,Cheng Yezeng,Shen Zhaolong et al.. Influence of refractive index mismatch on the optical aberration in two-photon three-dimensional optical data storage [J]. Acta Optica Sinica,2006,26(3):443-446

[3] S. Spielman,B. V. Johnson,G. McDermott et al.. Using pit-depth modulation to increase capacity and data transfer rate in optical discs [C]. SPIE,1997,3109:98-104

[4] J. Nakajima,S. Terashima,K. Ohta et al.. Readout of optical disk recorded by pit edge and depth modulation [J]. Jpn. J. Appl. Phys.,2001,40(3B):1846-1849

[5] Song Jie,Xu Duanyi,Qi Guosheng et al.. Multilevel read-only optical recording methods [J]. Chin. Phys.,2006 15(8):1788-1792

[6] J. Song,Y. Ni,D. Y. Xu et al.. Modeling and realization of a multilevel read-only disk [J]. Opt. Express,2006,14(03):1199-1207

[7] Tang Yi,Pei Jing,Pan Longfa et al.. Simulation analysis and experiment validation of a new multi-level read-only optical recording method [J]. Acta Optica Sinica,2008,28(7):1353-1358

[8] Tang Yi,Pei Jing,Pan Longfa et al.. experiments of multi-level read-only recording using readout signal wave-shape modulation[J]. Chin. Phys. Lett.,2008,25(5):1709-1712

[9] Tang Yi,Pei Jing,Ni Yi et al.. Multi-level read-only recording using signal waveform modulation[J]. Opt. Express,2008,16(9):6156-6172

[10] Q. C. Zhang,J. P. Xiong,D. Y. Xu et al.. A viterbi detector with feedback used in multilevel run-length-limited modulation optical recording [J]. Jpn. J. Appl. Phys.,2006,45(8A):6331-6333

[11] H. Cho,J. An,S. Ong et al.. Partial response maximum-likehood system and crosstalk cancellation method for high-density optical recording[J]. Opt. Eng.,2001,40(8):1621-1628