◇◇新语丝(www.xys.org)(xys.dxiong.com)(xys.freedns.us)(xys-reader.org)◇◇ 【方舟子按:没有资料表明“美国电气电子工程师学会(IEEE)组织第三方独立 专家对此事件进行了认真审查,认为美国《光波技术》刊登的编者按和姚晓天的 评论是错误的”,向杨昌喜教授索取,他也未能提供证据证明IEEE做过调查或有 过结论。发表被揭发对象的回应文章不过是尊重其辩护权利,是国际学术期刊的 常规做法,并非在否定前面的揭露,更不能说明什么结论。】 方先生,您好! 天津大学长江特聘教授姚晓天利用他与美国《光波技术》前主编Alan Willner博士的合作文章,指责我发表在《中国物理快报》上的文章是对他文章 的抄袭,此事已持续两年多。《新语丝》刊登了多篇姚晓天诽谤我的文章。最近, 美国电气电子工程师学会(IEEE)组织第三方独立专家对此事件进行了认真审查, 认为美国《光波技术》刊登的编者按(JLT, vol. 24, no. 2, p. 656, Feb. 2006))和姚晓天的评论(JLT, vol. 24, no. 2, p. 657, Feb. 2006)是错误 的,于今年2月发表了我的回应文章(JLT, vol. 25, no. 2, p. 650, Feb. 2007),以正视听, 并以此结束我与姚晓天之间的学术纷争。 我希望《新语丝》刊登有关事实真相,请见附件。 谢谢! 杨昌喜 清华大学 清华大学杨昌喜教授与天津大学长江特聘教授姚晓天学术之争的情况说明 杨昌喜   天津大学长江特聘教授姚晓天利用他与美国《光波技术》前主编Alan Willner博士的合作文章,指责我发表在《中国物理快报》上的文章是对他文章 的抄袭,此事已持续两年多。2006年2月姚晓天等人和美国《光波技术》编委 John Lee在美国《光波技术》上发表了评论和编者按,对我的文章进行了不符合 科学事实的评价,我对美国《光波技术》前主编Alan Willner和编委John Lee等 人违背科学事实的做法提出了强烈抗议,美国电气电子工程师学会(IEEE)组织 第三方独立专家对此事件进行了认真审查,认为美国《光波技术》刊登的编者按 (JLT, vol. 24, no. 2, p. 656, Feb. 2006))和姚晓天的评论(JLT, vol. 24, no. 2, p. 657, Feb. 2006)是错误的,于今年2月发表了我的回应文章(JLT, vol. 25, no. 2, p. 650, Feb. 2007),以正视听, 并以此结束我与姚晓天之间 的学术纷争。   下面是我发表在美国《光波技术》上,对John Lee编者按的回应文章及参考 译文: 650 JOURNAL OF LIGHTWAVE TECHNOLOGY, VOL. 25, NO. 2, FEBRUARY 2007 Correspondence Crystal-Length Arrangement is Technically Crucial in Birefringent Crystal-Based PMD Compensators Changxi Yang The JOURNAL OF LIGHTWAVE TECHNOLOGY (JLT) recently published an editorial preface in JLT (vol. 24, no. 2, p. 656, Feb. 2006) to support the Note authored by X. S. Yao and L. Yan (JLT, vol. 24, no. 2, p. 657, Feb. 2006), which challenged my paper published in Chinese Physics Letters (CPL) [1]. The preface states that the crystal length arrangement with respect to the light is not technically crucial. Unfortunately, this description misses the point. Yan et al. reported a group-delay module based on six crystal stages in a length-increasing arrangement with respect to light [2], [3]. However, Yang et al. reported a polarization-mode dispersion (PMD) compensator with six crystal stages in a length-decreasing arrangement [1], [4], [5]. Three months before I submitted my paper to CPL, the PMD compensator reported in the CPL paper [1] had been patented in China [4]. The two experimental configurations in the JLT paper [2] and the CPL paper [1] are essentially different, which has been proven theoretically and experimentally by Li [5] and Kieckbusch et al. [6]. Thus, the crystal-length arrangement with respect to light is technically crucial in birefringent crystal-based PMD compensators. In addition to different device configurations, the characterization method of the CPL paper [1] is also different from that in the JLT paper [2]. Moreover, Yang et al. reported the differential group delay (DGD) and second-order PMD (SOPMD) of the PMD compensator as functions of frequency, whereas Yan et al. did not provide any information on the frequency response of the DGD and SOPMD of their device. Thus, the CPL paper [1] is not a duplicate of the JLT paper [2]. Possibly, a similar birefringent crystal and dimensions of the crystal stages were used in the JLT paper and the CPL paper, which leads to similar DGDs and SOPMDs. REFERENCES [1] C. Yang, S. Li, H.Miao, Y. Tian, E. Zhang, and G. Jin, “Compact first-order polarization mode dispersion compensator based on birefringent crystals,” Chin. Phys. Lett., vol. 21, no. 2, pp. 326–328, Feb. 2004. [2] L. Yan, C. Yeh, G. Yang, L. Lin, Z. Chen, Y. Shi, A. Willner, and X. Yao, “Programmable group delay module using binary polarization switching,” J. Lightw. Technol., vol. 21, no. 7, pp. 1676–1684, Jul. 2003. [3] L. Yan, C. Yeh, G. Yang, L. Lin, Z. Chen, Y. Shi, and X. Yao, “Fast digitally variable differential group delay module using polarization switching,” presented at the Optical Fiber Commun. Conf., Anaheim, CA, Mar. 2002, Post-Deadline Paper FA5. [4] C. Yang and S. Li, “PMD compensation system,” Chinese Patent ZL03150120.6, Jul. 18, 2003. [5] S. Li, “Polarization mode dispersion compensator and its application in optical fiber communication systems,” Ph.D. dissertation, Tsinghua Univ., Beijing, China, Apr. 2005. [6] S. Kieckbusch, S. Ferber, H. Rosenfeldt, R. Ludwig, C. Boerner, A. Ehrhardt, E. Brinkmeyer, and H.-G. Weber, “Automatic PMD compensator in a 160-Gb/s OTDM transmission over deployed fiber using RZ-DPSK modulation format,” J. Lightw. Technol., vol. 23, no. 1, pp. 165–171, Jan. 2005. 0733-8724/$25.00 ? 2007 IEEE Manuscript received February 23, 2006; revised August 26, 2006. The author is with the Department of Precision Instruments, Tsinghua University, Beijing 100084, China (e-mail: cxyang@tsinghua.edu.cn). Digital Object Identifier 10.1109/JLT.2006.886720 参考译文: 双折射晶体偏振模色散补偿器中晶体长度的排列方式是关键性技术 (JLT, vol. 25, no. 2 p. 650, Feb. 2007) 杨昌喜   《光波技术》(Journal of Lightwave Technology (JLT))最近发表了编 者按(JLT, vol. 24, no. 2 p. 656, Feb. 2006),支持由姚晓天和L. Yan撰 写的评论(JLT, vol. 24, no. 2, p. 657, Feb. 2006),来挑战我发表在《中 国物理快报》(CPL)上的文章[1],JLT编者按描述到:相对光的传播方向,晶体 长度的排列方式不同不是关键性技术。遗憾的是,这种描述违背了科学事实。    姚晓天和L. Yan等人报道了由六块晶体组成的群时延模块,其晶体长度 沿光的传播方向递增[2],[3]。我所报道的是由六块晶体组成的偏振模色散补偿 器,其晶体长度沿光的传播方向递减[1],[4],[5]。在我向《中国物理快报》 投稿前三个月,我已经就该文中所报道的偏振模色散补偿器申请了中国发明专利 [4]。姚晓天和L. Yan等人在《光波技术》文章中所报道的器件的实验结构[2] 与我在《中国物理快报》文章中所报道的器件的实验结构本质上是不同的,这已 被李世光[5]和Kieckbusch等人[6]从理论和实验上证实。由此可见,在双折射晶 体偏振模色散补偿器中,晶体长度排列方式是关键性技术。    在这两篇文章中除了器件结构不同之外,我的实验测试方法也不同于姚 晓天和L. Yan等人的实验测试方法[2],而且我还报道了偏振模色散补偿器的群 时延(DGD)和二阶偏振模色散(SOPMD)的频率响应特性,姚晓天和L. Yan等人并没 有给出他们的器件的群时延和二阶偏振模色散的频率响应特性。因此,我发表在 《中国物理快报》上的文章[1]不是对姚晓天和L. Yan等人发表在《光波技术》 上文章[2] 的复制。    我的文章和姚晓天、L. Yan等人文章可能采用了类似的双折射晶体和 类似的晶体尺寸,才导致具有类似的群时延和二阶偏振模色散值。 参考文献: 1. C. Yang, S. Li, H. Miao, Y. Tian, E. Zhang, and G. Jin, “Compact first-order polarization mode dispersion compensator based on birefringent crystals,” Chin. Phys. Lett., vol. 21, pp. 326-328 Feb. 2004. 2. L. Yan, C. Yeh, G. Yang, L. Lin, Z. Chen, Y. Shi, A. Willner, and X. Yao, “Programmable group delay module using binary polarization switching,” J.Lightwave Technol., vol. 21, pp. 1676-1684, Jul. 2003. 3. L. Yan, C. Yeh, G. Yang, L. Lin, Z. Chen, Y. Shi, and X. Yao, “Fast digitally variable differential group delay module using polarization switching,” in Proc. Opt. Fiber Commun. Conf., Post-Deadline Paper FA5, Anaheim, CA, Mar. 2002. 4. C. Yang and S. Li, “PMD compensation system,” Chinese Patent ZL03150120.6, July 18, 2003. 5. S. Li, “Polarization mode dispersion compensator and its application in optical fiber communication systems,” Ph. D. Dissertation, Tsinghua University, Beijing, China, Apr. 2005, pp. 46-52. 6. S. Kieckbusch, S. Ferber, H. Rosenfeldt, R. Ludwig, C. Boerner, A. Ehrhardt, E. Brinkmeyer, and H. –G. Weber, “Automatic PMD compensator in a 160-Gb/s OTDM transmission over deployed fiber using RZ-DPSK modulation format,” J. Lightwave Technol., vol 23, No. 1, pp. 165-171, Jan. 2005. (XYS20070724) ◇◇新语丝(www.xys.org)(xys.dxiong.com)(xys.freedns.us)(xys-reader.org)◇◇