Abstract

This work demonstrated a new approach of planar multi-channel wavelength division multiplexing (WDM) system using photonic crystal structures. The system consists of a waveguide that is realized by a defect row of photonic crystal and high Q-value micro-cavities with asymmetric super-cell design. Two-Dimension (2-D) Finite-Difference-Time-Domain (FDTD) method is performed for simulation in this paper. The results showed good ability to filter an incident pulse into six spectral channels with a FHWM improved from 3.6 nm to 1.4 nm and the coherence length improved from 0.667 cm to 1.716 cm at the center wavelength 1550 nm channel and no transmission degradation. Six-channel coarse wavelength division multiplexing (CWDM) from 1490~1590 nm with channel spacing of 20 nm which defined by ITU-T Recommendation G.694.2 are presented. And the inter-channel cross-talk is smaller than -17 dB. The device design is leading the way to achieve CWDM specification and has good capability to extend the application of communication filed and fiber optical sensor field.

© 2007 Optical Society of America

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References

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    [CrossRef]
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  11. F. Bouef et al., "0.248μm2 and 0.334μm2 Conventional Bulk 6T-SRAM bit-cells for 45nm node Low Cost-General Purpose Applications," in Proceedings of IEEE Conference on VLSI (Institute of Electrical and Electronics Engineers, Kyoto, 2005), pp. 130-131.

2006

2005

Bong-Shik Song, Takashi Asano, Yoshihiro Akahane, Yoshinori Tanaka, and Susumu Noda, "Multichannel Add/Drop Filter Based on In-Plane Hetero Photonic Crystals," IEEE J. Lightwave Technol. 23, 1449-1455 (2005).
[CrossRef]

2004

2002

John Huh, Jeong-Ki Hwang, Han-Youl Ryu, and Yong-Hee Lee, "Nondegenerate monopole mode of single defect two-dimensional triangular photonic band-gap cavity," Appl. Phys. 92, 654-659 (2002).

2001

1998

1987

E. Yablnovitch, "Inhibited spontaneous emission in solid-state physics and electronics," Phys. Rev. Lett. 58, 2059-2062 (1987).
[CrossRef]

S. John, "Strong localization of photons in certain disordered dielectric superlattices," Phys. Rev. Lett. 58, 2486-2489 (1987).
[CrossRef] [PubMed]

Appl. Opt.

Appl. Phys.

John Huh, Jeong-Ki Hwang, Han-Youl Ryu, and Yong-Hee Lee, "Nondegenerate monopole mode of single defect two-dimensional triangular photonic band-gap cavity," Appl. Phys. 92, 654-659 (2002).

IEEE J. Lightwave Technol.

Bong-Shik Song, Takashi Asano, Yoshihiro Akahane, Yoshinori Tanaka, and Susumu Noda, "Multichannel Add/Drop Filter Based on In-Plane Hetero Photonic Crystals," IEEE J. Lightwave Technol. 23, 1449-1455 (2005).
[CrossRef]

Opt. Express

Phys. Rev. Lett.

E. Yablnovitch, "Inhibited spontaneous emission in solid-state physics and electronics," Phys. Rev. Lett. 58, 2059-2062 (1987).
[CrossRef]

S. John, "Strong localization of photons in certain disordered dielectric superlattices," Phys. Rev. Lett. 58, 2486-2489 (1987).
[CrossRef] [PubMed]

Other

HermannA.  Haus, Waves and Fields in Optoelectronics (Englewood Cliffs, NJ: Prentice-Hall, 1984), Chap. 7.

F. Bouef et al., "0.248μm2 and 0.334μm2 Conventional Bulk 6T-SRAM bit-cells for 45nm node Low Cost-General Purpose Applications," in Proceedings of IEEE Conference on VLSI (Institute of Electrical and Electronics Engineers, Kyoto, 2005), pp. 130-131.

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Figures (11)

Fig. 1.
Fig. 1.

(a) Band map of photonic crystal structure; (b) Band structure of photonic crystal structure

Fig. 2.
Fig. 2.

The resonant frequency range of variation defect radius for specified wavelength selection

Fig. 3.
Fig. 3.

2-D planar six-channel photonic crystal WDM structure

Fig. 4.
Fig. 4.

Output spectral channel wavelength (λ1:1491 nm; λ2:1510 nm; λ3:1530 nm; λ4:1549 nm; λ5:1571 nm; λ6:1591 nm)

Fig. 5.
Fig. 5.

WDM system output wavelength vs. micro-cavity defect radius variation

Fig. 6.
Fig. 6.

The band structure comparison of Left: 7×7 super cell micro-cavity and Right: 5×5 super-cell micro-cavity. (Defect radius: 60.21 nm)

Fig. 7.
Fig. 7.

Left: schematic of WDM; Middle: six-channel with 5×5 super cell WDM system (Higher transmission ratio but wide bandwidth FHWM ~3.6nm at 1550 nm channel); Right: six-channel with 7×7 super cell WDM system (Lower transmission ratio but narrow bandwidth). (λ1:1491 nm; λ2:1510 nm; λ3:1530 nm; λ4:1549 nm; λ5:1.571 nm; λ6:1591 nm)

Fig. 8.
Fig. 8.

Symmetric array micro-cavity output spectral channel transmission performance comparison of with and without reflector

Fig. 9.
Fig. 9.

2-D six-channel asymmetry super cell micro-cavity with reflector photonic crystal WDM structure

Fig. 10.
Fig. 10.

Asymmetry array micro-cavity output spectral channel transmission performance comparison of symmetry array micro-cavity which all had reflector

Fig. 11.
Fig. 11.

The output transmission performance of asymmetry array micro-cavity with reflector and FHWM is ~1.4nm at 1550 nm channel (λ1=1492 nm, λ2=1510 nm, λ3=1529 nm, λ4=1550 nm, λ5=1570 nm, λ6=1592 nm)

Tables (2)

Tables Icon

Table 1. Propagation performance comparison of 7×7 and 5×5 super-cell micro-cavity

Tables Icon

Table 2. Asymmetry array micro-cavity with reflector inter-channel cross-talk performance

Equations (4)

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Q = λ Δ λ = ω Δ ω
L c = λ 2 Δ λ
T ( w ) = S ˜ 3 S ˜ + 1 2 = e j ( θ 1 θ 3 ) 2 τ i , b 2 τ i , d ( 1 + e ) j ( w w i ) + 2 τ i , b ( 1 + e ) + 2 τ i , d 2
T ( w ) = S ˜ 3 S ˜ + 1 2 = e j ( θ 1 θ 3 ) 2 τ i , b 2 τ i , d j ( w w i ) + 2 τ i , b + 2 τ i , d 2

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