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A low-loss and broadband terahertz twin-core photonic band-gap fiber directional coupler is proposed, which consists of a cladding with a triangular lattice array of sub-wavelength air rods and two cores formed respectively by omitting seven nearby air rods. The group velocity dispersion, the coupling and the loss of the fibers are investigated by using a full-vector finite element method. The numerical simulations show that the loss coefficient of the coupler is less than 0.021 cm-1, and the coupling broadband of 0.14 THz can be realized. The directional coupler has potential applications in terahertz communication systems, such as filtering, wavelength-division multiplexing, polarization isolation, switching and so on.
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Keywords:
- terahertz /
- terahertz photonic band-gap fiber /
- fiber coupler /
- coupling length
[1] O'Hara J, Grischkowsky D 2001 Opt. Lett. 26 1918
[2] Lee A W M, Hu Q 2005 Opt. Lett. 30 2563
[3] Stoik C D, Bohn M J, Blackshire J L 2008 Opt. Express 16 17039
[4] Tielrooij K J, Timmer R L A, Bakker H J, Bonn M 2009 Phys. Rev. Lett. 100 198303-1
[5] Han P Y, Cho G C, Zhang X C 2000 Opt. Lett. 25 242
[6] Mickan S P, Menikh A, Liu H B, Mannella C A, MacColl R, Abbott D, Munch J, Zhang X C 2002 Phys. Medic. Biol. 47 3789
[7] Wang W N, Li Y B, Yue W W 2005 Acta Phys. Sin. 54 781 [王卫宁, 李元波, 岳伟伟 2005 物理学报 54 781]
[8] Ma S H, Shi Y L, Xu X L, Yan W, Yang Y P, Wang L 2006 Acta Phys. Sin. 55 4091 [马士华, 施宇蕾, 徐新龙, 严伟, 杨玉平, 汪力 2006 物理学报 55 4091]
[9] Ma X J, Zhao H W, Dai B, Liu G F 2008 Acta Phys. Sin. 57 3429 [马晓菁, 赵红卫, 代斌, 刘桂锋 2008 物理学报 57 3429]
[10] Zhang X B, Shi W 2008 Acta Phys. Sin. 57 4984 [张显斌, 施卫 2008 物理学报 57 4984]
[11] McGowan R W, Gallot G, Grischkowsky D 1999 Opt. Lett. 24 1431
[12] Gallot G, Jamison S P, McGowan R W, Grischkowsky D 2000 J. Opt. Soc. Am. B 17 851
[13] Chen L J, Chen H W, Kao T F, Lu J Y, Sun C K 2006 Opt. Lett. 31 308
[14] Lu J Y, Yu C P, Chang H C, Chen H W, Li Y T, Pan C L, Sun C K 2008 Appl. Phys. Lett. 92 064105-1
[15] Hassani A, Dupuis A, Skorobogatiya M 2008 Appl. Phys. Lett. 92 071101-1
[16] Dupuis A, Allard J F, Morris D, Stoeffler K, Dubois C, Skorobogatiy M 2009 Opt. Express 17 8012
[17] Nielsen K, Rasmussen H K, Jepsen P U, Bang O 2010 Opt. Lett. 35 2879
[18] Chantry G W, Fleming J W, Smith P M, Cudby M, Willis H A 1971 Chem. Phys. Lett. 10 473
[19] Wang Z, Kai G, Liu Y, Liu J, Zhang C, Sun T, Wang C, Zhang W, Yuan S, Dong X 2005 Opt. Lett. 30 2542
[20] Saitoh K, Sato Y, Koshiba M 2003 Opt. Express 11 3188
[21] Atakaramians S, Afshar V S, Fischer B M, Abbott D, Monro T M 2008 Opt. Express 16 8845
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[1] O'Hara J, Grischkowsky D 2001 Opt. Lett. 26 1918
[2] Lee A W M, Hu Q 2005 Opt. Lett. 30 2563
[3] Stoik C D, Bohn M J, Blackshire J L 2008 Opt. Express 16 17039
[4] Tielrooij K J, Timmer R L A, Bakker H J, Bonn M 2009 Phys. Rev. Lett. 100 198303-1
[5] Han P Y, Cho G C, Zhang X C 2000 Opt. Lett. 25 242
[6] Mickan S P, Menikh A, Liu H B, Mannella C A, MacColl R, Abbott D, Munch J, Zhang X C 2002 Phys. Medic. Biol. 47 3789
[7] Wang W N, Li Y B, Yue W W 2005 Acta Phys. Sin. 54 781 [王卫宁, 李元波, 岳伟伟 2005 物理学报 54 781]
[8] Ma S H, Shi Y L, Xu X L, Yan W, Yang Y P, Wang L 2006 Acta Phys. Sin. 55 4091 [马士华, 施宇蕾, 徐新龙, 严伟, 杨玉平, 汪力 2006 物理学报 55 4091]
[9] Ma X J, Zhao H W, Dai B, Liu G F 2008 Acta Phys. Sin. 57 3429 [马晓菁, 赵红卫, 代斌, 刘桂锋 2008 物理学报 57 3429]
[10] Zhang X B, Shi W 2008 Acta Phys. Sin. 57 4984 [张显斌, 施卫 2008 物理学报 57 4984]
[11] McGowan R W, Gallot G, Grischkowsky D 1999 Opt. Lett. 24 1431
[12] Gallot G, Jamison S P, McGowan R W, Grischkowsky D 2000 J. Opt. Soc. Am. B 17 851
[13] Chen L J, Chen H W, Kao T F, Lu J Y, Sun C K 2006 Opt. Lett. 31 308
[14] Lu J Y, Yu C P, Chang H C, Chen H W, Li Y T, Pan C L, Sun C K 2008 Appl. Phys. Lett. 92 064105-1
[15] Hassani A, Dupuis A, Skorobogatiya M 2008 Appl. Phys. Lett. 92 071101-1
[16] Dupuis A, Allard J F, Morris D, Stoeffler K, Dubois C, Skorobogatiy M 2009 Opt. Express 17 8012
[17] Nielsen K, Rasmussen H K, Jepsen P U, Bang O 2010 Opt. Lett. 35 2879
[18] Chantry G W, Fleming J W, Smith P M, Cudby M, Willis H A 1971 Chem. Phys. Lett. 10 473
[19] Wang Z, Kai G, Liu Y, Liu J, Zhang C, Sun T, Wang C, Zhang W, Yuan S, Dong X 2005 Opt. Lett. 30 2542
[20] Saitoh K, Sato Y, Koshiba M 2003 Opt. Express 11 3188
[21] Atakaramians S, Afshar V S, Fischer B M, Abbott D, Monro T M 2008 Opt. Express 16 8845
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