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     ѧƸҦⲨǰAlan 
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ΪⲨǵı߰JLT, vol. 24, no. 2, p. 656, Feb. 
2006)ҦۣJLT, vol. 24, no. 2, p. 657, Feb. 2006Ǵ
ģڽ2·ҵĻӦ(JLT, vol. 25, no. 2, p. 650, Feb. 
2007), Դ˽Ҧ֮ѧ

    ϣ˿йʵ࣬

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ѧƸҦⲨǰAlan 
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ĳϮѳࡣ20062Ҧ˺Ⲩί
John LeeⲨϷۺͱ߰ҵ½˲
ѧʵۣҶⲨǰAlan WillnerͱίJohn Lee
Υѧʵǿҿ飬ӹʦѧᣨIEEE֯
רҶԴ¼飬ΪⲨǵı߰
JLT, vol. 24, no. 2, p. 656, Feb. 2006)ҦۣJLT, vol. 24, 
no. 2, p. 657, Feb. 2006Ǵģڽ2·ҵĻӦ(JLT, 
vol. 25, no. 2, p. 650, Feb. 2007), Դ˽Ҧ֮
ѧ

ҷⲨϣJohn Lee߰ĻӦ¼ο
ģ

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. 326C328, 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. 1676C1684,
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. 165C171, 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
οģ
˫侧ƫģɫɢо峤ȵзʽǹؼԼ
(JLT, vol. 25, no. 2 p. 650, Feb. 2007

ϲ

ⲨJournal of Lightwave Technology (JLT)˱
߰JLT, vol. 24, no. 2 p. 656, Feb. 2006֧ҦL. Yan׫
дۣJLT, vol. 24, no. 2, p. 657, Feb. 2006սҷڡ
챨(CPL)ϵ[1]JLT߰ԹĴ򣬾
ȵзʽͬǹؼԼźǣΥ˿ѧʵ
	ҦL. Yan˱龧ɵȺʱģ飬侧峤
عĴ[2][3]龧ɵƫģɫɢ
侧峤عĴݼ[1][4][5]й챨
Ͷǰ£Ѿ͸ƫģɫɢйר
[4]ҦL. YanڡⲨʵṹ[2] 
ڡй챨ʵṹǲͬģ
[5]Kieckbusch[6]ۺʵ֤ʵɴ˿ɼ˫侧
ƫģɫɢУ峤зʽǹؼԼ
	ƪгṹ֮ͬ⣬ҵʵԷҲͬҦ
L. Yan˵ʵԷ[2]һƫģɫɢȺ
ʱ(DGD)Ͷƫģɫɢ(SOPMD)ƵӦԣҦL. Yan˲û
иǵȺʱӺͶƫģɫɢƵӦԡˣҷ
й챨ϵ[1]ǶҦL. Yan˷ڡⲨ
[2] ĸơ
	 ҵºҦ졢L. Yan¿ܲƵ˫侧
Ƶľߴ磬ŵ¾ƵȺʱӺͶƫģɫɢֵ

ο:
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. CG. 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.

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