Five-port beam splitter of a single-groove grating Download： 689次 | Chinese Optics Letters -- 中国光学期刊网

Chinese Optics Letters, 2018, 16 (7): 070501, Published Online: Jul. 19, 2018

Five-port beam splitter of a single-groove grating Download： 689次

Changcheng Xiang ^1,2Changhe Zhou ^1,*Wei Jia ³Jun Wu ¹

Author Affiliations

¹ Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

² University of Chinese Academy of Sciences, Beijing 100049, China

³ Institute of Photonics Technology, Jinan University, Guangzhou 510632, China

Figures & Tables

Fig. 1. Illustration of a single-groove grating for five-port beam splitting.

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Fig. 2. Unified profiles of all of the propagating modes of a grating under a normal incidence with five transmitted orders. The shaded region is meant to be the ridge of the grating region. The parameters of the grating are $f = 0.5$ , $Λ = 3800 nm$ , wavelength of incidence is $λ = 1550 nm$ , the refractive indices of the groove and ridge are $n_{g} = 1$ , $n_{c} = 1.5007$ . Modes 0, 1, 4 are odd symmetric, while modes 2, 3, 5 are even symmetric.

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Fig. 3. Contour plot of uniformity (%) calculated by SMM. The grating material is BK-7 glass, and its duty cycle is $f = 0.5$ .

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Fig. 4. (a) Total transmitted diffraction efficiency and (b) uniformity of $1 \times 5$ beam splitting gratings with some fabrication errors.

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Table1. Coupling Coefficients and Effective Indices

Mode	0	1	2	3	4	5
$n_{eff}$	2.1431	1.8245	1.3393	0.8252	0.7955	0.1228
${\| J_{q 0} \|}^{2}$	0	0	0.5454	0.1792	0	0.2689

Table2. Diffraction Efficiency and Uniformity Before and After Optimization

	Diffraction efficiency (%)
Parameter	$+ 2 nd$	$+ 1 st$	0th	$- 1 st$	−2nd	Total	Uniformity (%)
Before	18.37	18.69	19.43	18.69	18.37	93.5	2.83
After	18.96	18.98	18.96	18.98	18.96	94.8	0.39

Changcheng Xiang, Changhe Zhou, Wei Jia, Jun Wu. Five-port beam splitter of a single-groove grating[J]. Chinese Optics Letters, 2018, 16(7): 070501.

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