Abstract

We propose and demonstrate an optical 60° hybrid for demodulating optical signals with six-level DPSK modulation format. The proposed device consisting of a paired-interference 26MMI coupler, phase shifters, and 22MMI couplers with an asymmetric splitting ratio of 7228 exhibited hexagonal phase response over a C-band range.

© 2011 Optical Society of America

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References

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  1. L. Zimmermann, K. Voigt, G. Winzer, K. Petermann, and C. M. Weinert, IEEE Photon. Technol. Lett. 21, 143 (2009).
    [CrossRef]
  2. C. Kim and G. Li, Opt. Express 12, 3415 (2004).
    [CrossRef] [PubMed]
  3. M. Serbay, C. Wree, and W. Rosenkranz, in Proceedings of the IEEE Topical Meeting on Lasers and Electro-Optics Society (LEOS) 2005 (IEEE, 2005), paper WE3.
  4. Y. Takushima, H. Y. Choi, and Y. C. Chung, IEEE Photon. Technol. Lett. 21, 1411 (2009).
    [CrossRef]
  5. K. Fukuchi, in Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference, OSA Technical Digest (CD) (Optical Society of America, 2008), paper OMI6.
  6. S.-H. Jeong and K. Morito, in Proceedings of the European Conference on Optical Communications (ECOC) 2009 (ECOC, 2009), paper 2.2.3.
  7. S.-H. Jeong and K. Morito, Opt. Lett. 34, 3505 (2009).
    [CrossRef] [PubMed]
  8. S.-H. Jeong and K. Morito, J. Lightwave Technol. 28, 1323 (2010).
    [CrossRef]
  9. S.-H. Jeong and K. Morito, Opt. Express 18, 8482 (2010).
    [CrossRef] [PubMed]
  10. M. Bachmann, P. A. Besse, and H. Melchior, Appl. Opt. 34, 6898 (1995).
    [CrossRef] [PubMed]
  11. D. S. Levy, Y. M. Li, R. Scarmozzino, and R. M. Osgood, IEEE Photon. Technol. Lett. 9, 1373 (1997).
    [CrossRef]

2010 (2)

2009 (3)

S.-H. Jeong and K. Morito, Opt. Lett. 34, 3505 (2009).
[CrossRef] [PubMed]

L. Zimmermann, K. Voigt, G. Winzer, K. Petermann, and C. M. Weinert, IEEE Photon. Technol. Lett. 21, 143 (2009).
[CrossRef]

Y. Takushima, H. Y. Choi, and Y. C. Chung, IEEE Photon. Technol. Lett. 21, 1411 (2009).
[CrossRef]

2004 (1)

1997 (1)

D. S. Levy, Y. M. Li, R. Scarmozzino, and R. M. Osgood, IEEE Photon. Technol. Lett. 9, 1373 (1997).
[CrossRef]

1995 (1)

Bachmann, M.

Besse, P. A.

Choi, H. Y.

Y. Takushima, H. Y. Choi, and Y. C. Chung, IEEE Photon. Technol. Lett. 21, 1411 (2009).
[CrossRef]

Chung, Y. C.

Y. Takushima, H. Y. Choi, and Y. C. Chung, IEEE Photon. Technol. Lett. 21, 1411 (2009).
[CrossRef]

Fukuchi, K.

K. Fukuchi, in Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference, OSA Technical Digest (CD) (Optical Society of America, 2008), paper OMI6.

Jeong, S.-H.

Kim, C.

Levy, D. S.

D. S. Levy, Y. M. Li, R. Scarmozzino, and R. M. Osgood, IEEE Photon. Technol. Lett. 9, 1373 (1997).
[CrossRef]

Li, G.

Li, Y. M.

D. S. Levy, Y. M. Li, R. Scarmozzino, and R. M. Osgood, IEEE Photon. Technol. Lett. 9, 1373 (1997).
[CrossRef]

Melchior, H.

Morito, K.

Osgood, R. M.

D. S. Levy, Y. M. Li, R. Scarmozzino, and R. M. Osgood, IEEE Photon. Technol. Lett. 9, 1373 (1997).
[CrossRef]

Petermann, K.

L. Zimmermann, K. Voigt, G. Winzer, K. Petermann, and C. M. Weinert, IEEE Photon. Technol. Lett. 21, 143 (2009).
[CrossRef]

Rosenkranz, W.

M. Serbay, C. Wree, and W. Rosenkranz, in Proceedings of the IEEE Topical Meeting on Lasers and Electro-Optics Society (LEOS) 2005 (IEEE, 2005), paper WE3.

Scarmozzino, R.

D. S. Levy, Y. M. Li, R. Scarmozzino, and R. M. Osgood, IEEE Photon. Technol. Lett. 9, 1373 (1997).
[CrossRef]

Serbay, M.

M. Serbay, C. Wree, and W. Rosenkranz, in Proceedings of the IEEE Topical Meeting on Lasers and Electro-Optics Society (LEOS) 2005 (IEEE, 2005), paper WE3.

Takushima, Y.

Y. Takushima, H. Y. Choi, and Y. C. Chung, IEEE Photon. Technol. Lett. 21, 1411 (2009).
[CrossRef]

Voigt, K.

L. Zimmermann, K. Voigt, G. Winzer, K. Petermann, and C. M. Weinert, IEEE Photon. Technol. Lett. 21, 143 (2009).
[CrossRef]

Weinert, C. M.

L. Zimmermann, K. Voigt, G. Winzer, K. Petermann, and C. M. Weinert, IEEE Photon. Technol. Lett. 21, 143 (2009).
[CrossRef]

Winzer, G.

L. Zimmermann, K. Voigt, G. Winzer, K. Petermann, and C. M. Weinert, IEEE Photon. Technol. Lett. 21, 143 (2009).
[CrossRef]

Wree, C.

M. Serbay, C. Wree, and W. Rosenkranz, in Proceedings of the IEEE Topical Meeting on Lasers and Electro-Optics Society (LEOS) 2005 (IEEE, 2005), paper WE3.

Zimmermann, L.

L. Zimmermann, K. Voigt, G. Winzer, K. Petermann, and C. M. Weinert, IEEE Photon. Technol. Lett. 21, 143 (2009).
[CrossRef]

Appl. Opt. (1)

IEEE Photon. Technol. Lett. (3)

Y. Takushima, H. Y. Choi, and Y. C. Chung, IEEE Photon. Technol. Lett. 21, 1411 (2009).
[CrossRef]

L. Zimmermann, K. Voigt, G. Winzer, K. Petermann, and C. M. Weinert, IEEE Photon. Technol. Lett. 21, 143 (2009).
[CrossRef]

D. S. Levy, Y. M. Li, R. Scarmozzino, and R. M. Osgood, IEEE Photon. Technol. Lett. 9, 1373 (1997).
[CrossRef]

J. Lightwave Technol. (1)

Opt. Express (2)

Opt. Lett. (1)

Other (3)

M. Serbay, C. Wree, and W. Rosenkranz, in Proceedings of the IEEE Topical Meeting on Lasers and Electro-Optics Society (LEOS) 2005 (IEEE, 2005), paper WE3.

K. Fukuchi, in Optical Fiber Communication Conference and Exposition and The National Fiber Optic Engineers Conference, OSA Technical Digest (CD) (Optical Society of America, 2008), paper OMI6.

S.-H. Jeong and K. Morito, in Proceedings of the European Conference on Optical Communications (ECOC) 2009 (ECOC, 2009), paper 2.2.3.

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Figures (6)

Fig. 1
Fig. 1

Schematic diagram of the proposed optical 60 ° hybrid.

Fig. 2
Fig. 2

Schematic diagrams of 6-DPSK demodulators employing (a) three pairs of DIs and 2 2 optical couplers, (b) one pair of a DI and a 6 6 MMI coupler, and (c) one pair of a DI and the proposed scheme.

Fig. 3
Fig. 3

Calculated phase deviation ( Δ ϕ ) of the (a) proposed scheme and the (b) 6 6 MMI coupler.

Fig. 4
Fig. 4

Top views of the fabricated 60 ° hybrids using the (a) proposed scheme and the (b) 6 6 MMI coupler.

Fig. 5
Fig. 5

Measured transmission spectra of the (a) proposed scheme and the (b) 6 6 MMI coupler.

Fig. 6
Fig. 6

Experimentally estimated phase deviation ( Δ ϕ ) of the (a) proposed scheme and the (b) 6 6 MMI coupler.

Equations (3)

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θ 1 θ 2 = + π / 2 ,
θ 3 θ 4 = π / 6.
[ E 1 E 2 E 3 E 4 E 5 E 6 ] = [ T 26 ] · [ 1 0 0 0 0 0 0 1 0 0 0 0 0 0 e j θ 1 0 0 0 0 0 0 e j θ 2 0 0 0 0 0 0 e j θ 3 0 0 0 0 0 0 e j θ 4 ] · [ 1 0 0 0 0 0 0 1 0 0 0 0 0 0 1 κ j κ 0 0 0 0 j κ 1 κ 0 0 0 0 0 0 1 κ j κ 0 0 0 0 j κ 1 κ ] · [ E S 1 E S 2 0 0 0 0 ] = [ E S 1 E S 2 E S 1 + E S 2 E S 1 ( 1 j 3 ) / 2 · E S 2 E S 1 + ( 1 j 3 ) / 2 · E S 2 E S 1 + ( 1 + j 3 ) / 2 · E S 2 E S 1 ( 1 + j 3 ) / 2 · E S 2 ] .

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