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MMI Multiplexer for Dual-Channel Erbium-Doped Waveguide Amplifiers

A. Bakhtazad, J. N. McMullin, C. J. Haugen, and R. G. DeCorby

Open Access Open Access

Abstract

A multimode interference coupler is proposed for pumping two erbium-doped waveguide amplifiers from a single 980 nm pump channel. Simulations predict that a device less than 2500 µm long can be made with signal and pump power losses of 0.28 dB and 0.63 dB respectively. The calculated 1 dB excess loss bandwidth of the device is 57 nm.

©2001 Optical Society of America

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Figures (6)
Fig.1
Fig.1 Field pattern near the input of a center-fed MMI coupler. Input waveguides for a signal of different wavelength can be introduced into a dead zone without disrupting the original field.

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Fig. 2.
Fig. 2. (a) Proposed structure if L<L′. (b) Proposed structure if L>L′. Note that the diagrams are not shown to scale.

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Fig. 3.
Fig. 3. Silica-based glass waveguide system. The shown values of refractive indices are for 980/1550 nm respectively.

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Fig 4.
Fig 4. Optimum device length at 1550 nm and 980 nm versus tapering length. The corresponding insertion loss as a function of tapering length is also shown

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Fig 5.
Fig 5. (a) The field pattern of the optimized device for one 1550 nm signal. (b) The field pattern of the optimized device for the 980 nm pump signal.

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Fig. 6.
Fig. 6. Sensitivity of excess loss to variations in wavelength, MMI width and MMI length.

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Equations (7)

Equations on this page are rendered with MathJax. Learn more.

θ c = cos ⁡ − 1 n cl n co
Δ L / 2 W / 4 ≤ cot ( θ c ) .
n co = 1.5213 and n cl = 1.4592 at λ 1 , 2 = 1550 nm ,
n co ′ = 1.5471 and n cl ′ = 1.4859 at λ 0 = 980 nm .
L ≈ 3 L π
L ′ ≈ p 2 × 3 4 L π ′ = p 2 × 3 4 ( 1286.6 μ m ) = p ( 482.5 ) μ m , p = 1 , 2 , 3 , …
Δ L = L − L ′ ≈ 2482 − 2412 = 70 μ m .
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