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Design optimization of integrated BiDi triplexer optical filter based on planar lightwave circuit

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Abstract

Design optimization of a novel integrated bi-directional (BiDi) triplexer filter based on planar lightwave circuit (PLC) for fiber-to-the-premise (FTTP) applications is described. A multi-mode interference (MMI) device is used to filter the up-stream 1310nm signal from the down-stream 1490nm and 1555nm signals. An array waveguide grating (AWG) device performs the dense WDM function by further separating the two down-stream signals. The MMI and AWG are built on the same substrate with monolithic integration. The design is validated by simulation, which shows excellent performance in terms of filter spectral characteristics (e.g., bandwidth, cross-talk, etc.) as well as insertion loss.

©2006 Optical Society of America

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Figures (15)

Fig. 1.
Fig. 1. Schematic diagram of the bi-directional triplexer
Fig. 2.
Fig. 2. Leak loss and effective index of the first high order mode
Fig. 3.
Fig. 3. Bending loss of the channel waveguide at different bending radius
Fig. 4.
Fig. 4. spectral response of a standard 2x2 MMI without optimization
Fig. 5.
Fig. 5. Spectral response of a optimized 2×2 MMI
Fig. 6.
Fig. 6. field pattern of the optimized MMI at λ=1310nm.
Fig. 7.
Fig. 7. field pattern of the optimized MMI at λ=1555nm.
Fig. 8.
Fig. 8. Layout of the 1×2 AWG
Fig. 9.
Fig. 9. Peak powers from output waveguides at different taper widths of arrayed waveguides connecting to the second star coupler.
Fig. 10.
Fig. 10. Spectral response of the optimized 1×2 AWG
Fig. 11.
Fig. 11. Circuit layout of the designed triplexer
Fig. 12.
Fig. 12. Spectral response of the triplexer
Fig. 13.
Fig. 13. Cross-talk from the laser to the detectors.
Fig. 14.
Fig. 14. Polarization dependence of the 2×2 MMI coupler
Fig. 15.
Fig. 15. Polarization dependence of the AWG

Tables (1)

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Table 1. Simulation results of the final designed triplexer

Equations (4)

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L = 20 log e n i 2 π λ = 5.4575 × 10 4 n i λ dB mm
Δ = λ 0 2 N eff FSR
λ c = N eff Δ m
δ λ c = Δ m δ N eff Δ m δ n
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