Abstract

We identify a fundamental difference between the ASE noise filtering properties of different all-optical SOA-based switch configurations, and divide the switches into two classes. An in-band ASE suppression ratio quantifying the difference is derived theoretically and the impact of the ASE filtering on the optical spectrum is verified experimentally using a hybrid DISC setup. ASE power suppression of around 3 dB over the total signal bandwidth is demonstrated.

© 2005 Optical Society of America

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References

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Electron. Lett. (1)

R. J. Manning, A. Antonopolous, R. Le Roux, A. E. Kelly, �??Experimental measurement of nonlinear polarisation rotation in semiconductor optical amplifiers,�?? Electron. Lett. 37, 229 (2001)
[CrossRef]

J. Opt. Soc. Am. B (2)

Opt. Quantum Electron. (1)

J. Leuthold, B. Mikkelsen, G. Raybon, C. H. Joyner, J. L. Pleumeekers, B. I. Miller, K. Dreyer, R. Behringer, �??All-optical Wavelength Conversion between 10 and 100 Gb/s with SOA Delayed-interference Configuration�??, Opt. Quantum Electron. 33, 939 (2001)
[CrossRef]

Optics Lett. (1)

N. S. Patel, K. L. Hall, K. A. Rauschenbach, �??40-Gbit/s cascadable all-optical logic with an ultrafast nonlinear interferometer,�?? Optics Lett. 21, 1466 (1996)
[CrossRef]

Photonics Technol. Lett. (2)

J. P. Sokoloff, P. R. Prucnal, I. Glesk, M. Kane, �??A terahertz optical asymmetric demultiplexer (TOAD),�?? Photonics Technol. Lett. 5, 787 (1993)
[CrossRef]

J. Mørk, F. �?hman, S. Bischoff, �??Analytical Expression for the Bit-Error-Rate of Cascaded All-optical Regenerators,�?? Photonics Technol. Lett. 15, 1479 (2003)
[CrossRef]

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Figures (5)

Fig. 1.
Fig. 1.

Schematics of (a) the DISC configuration and (b) the SOA-based MZI configuration.

Fig. 2.
Fig. 2.

Normalized ASE power spectral density of SOA output (solid) and AMZI power transfer function (dashed) for τ=5 ps and Φ0=0.90π. Single-hatched area represents ASE power suppressed by AMZI.

Fig. 3.
Fig. 3.

Experimental setup: Inline implementation of DISC

Fig. 4.
Fig. 4.

(a) ASE spectra (resolution: 0.1 nm) at DISC output for TE/TM polarized ASE (solid/dashed), and for unpolarized ASE (dash-dotted). (b) Comparison of TE/TM ASE ratio (black squares) and ASE spectral fringe depth (white squares). Inset: detail of spectral fringe for I=150 mA.

Fig. 5.
Fig. 5.

Optical probe spectra at DISC output with input polarizer (thick, solid) and without polarizer (thin, dashed) for an SOA bias of 150 mA and an AMZI phase bias of Φ0=0.90 π. Inset: Cross-correlation trace of switched probe.

Equations (4)

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H AMZ ( λ ) 2 = 1 2 [ 1 + cos ( 2 π λ λ P Δ λ τ + Φ 0 ) ]
IBSR 1 = 1 2 [ 1 + cos ( Φ 0 ) sinc ( π Δ λ F Δ λ τ ) ]
P ˜ DISC CQP ( λ ) = P ˜ ASE TE ( λ ) H AMZ TE ( λ ) 2 + P ˜ ASE TM ( λ ) H AMZ TM ( λ ) 2
= P ˜ SOA ( λ ) 2 [ 1 + ( 2 r 1 ) cos ( 2 π λ λ P Δ λ τ + Φ 0 ) ]

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