Abstract

The push to develop 100 GHz and smaller bandwidth WDM filters is at demanding levels. Currently, 200 GHz is the standard bandwidth for multilayer interference coatings with high efficiencies, and enormous processing effort is going into the development of standard 100 GHz filters. This paper outlines a simple design that will reduce bandwidth up to 40% when applied to 200 GHz bandpass filters. This design method can also be used in existing 100 GHz designs to achieve even smaller bandwidths.

© 2000 Optical Society of America

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References

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  1. J.J. Pan, F.Q. Zhou, M. Zhou, “High-Performance Filters for Dense Wavelength-Division-Multiplexed Fiber Optic Communications,” Society of Vacuum Coaters 41st Annual Technical Conference Proceedings, ISSN 0737-5921, 217-9 (1998).
  2. P.W. Baumeister, “Bandpass filters for wavelength division multiplexing-modification of the spectral bandwidth,” Appl. Opt. 37, 6609-14 (1998).

1998 (1)

Baumeister, P.W.

Pan, J.J.

J.J. Pan, F.Q. Zhou, M. Zhou, “High-Performance Filters for Dense Wavelength-Division-Multiplexed Fiber Optic Communications,” Society of Vacuum Coaters 41st Annual Technical Conference Proceedings, ISSN 0737-5921, 217-9 (1998).

Zhou, F.Q.

J.J. Pan, F.Q. Zhou, M. Zhou, “High-Performance Filters for Dense Wavelength-Division-Multiplexed Fiber Optic Communications,” Society of Vacuum Coaters 41st Annual Technical Conference Proceedings, ISSN 0737-5921, 217-9 (1998).

Zhou, M.

J.J. Pan, F.Q. Zhou, M. Zhou, “High-Performance Filters for Dense Wavelength-Division-Multiplexed Fiber Optic Communications,” Society of Vacuum Coaters 41st Annual Technical Conference Proceedings, ISSN 0737-5921, 217-9 (1998).

Appl. Opt. (1)

Other (1)

J.J. Pan, F.Q. Zhou, M. Zhou, “High-Performance Filters for Dense Wavelength-Division-Multiplexed Fiber Optic Communications,” Society of Vacuum Coaters 41st Annual Technical Conference Proceedings, ISSN 0737-5921, 217-9 (1998).

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Figures (4)

Figure 1
Figure 1

Comparison of first and third order bandpass filters from Pan, Zhou, and Zhou1. The performance of the design glass/(HL)^6 H 6L H(LH)^6 L (HL)^7 H 4L H(LH)^7 L (HL)^7 H 6L H(LH)^7 L (HL)^6 H 8L H(LH)^7 L/ air is shown at λ0 (above) and at λ0/3 (below). Notice the 66% reduction in bandwidth for the third order. For the design, the indices of glass, L, and H are 1.51, 1.46, and 2.02 respectively. Each L or H represents a quarterwave optical thickness at λ0 = 1550nm.

Figure 2
Figure 2

Reflectivity comparison of the second order high reflecting stack for a 2:1 ratio stack of the design 2H (L 2H)^7 {solid} and a 3:1 reflecting stack of the design 3H (L 3H)^7 {dashed}, where H = 2.02 and L = 1.46, and where the second order high reflecting band was centered at 1550 nm

Figure 3
Figure 3

FWHM comparison of design in Figure 1 {dashed} and the refined 3:1 design where every H is replaced by a 3H{solid}.

Figure 4
Figure 4

FWHM comparison of design from Baumeister: glass/H L 0.174L 0.638H’ 0.174L L H 16L H(LH)^5 16L (HL)^3 0.16L 0.666H’ 0.16L(LH)^3 16L H(LH)^6 16L (HL)^3 0.16L 0.666H’ 0.16L(LH)^3 16L H(LH)^5 16L H L 0.411L 0.170H’ 0.411L L H/air {dashed} and the refined 3:1 design where every H is replaced by a 3H (the H’ is not changed) {solid}. For the design, the indices of glass, L, and H are 1.51, 1.46, and 2.02 respectively. Each L or H represents a quarterwave optical thickness at λ0 = 1550 nm.

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