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All-optical updating of subcarrier encoded packet headers with simultaneous wavelength conversion of baseband payload in semiconductor optical amplifiers

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2 Author(s)
Vaughn, M.D. ; Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA ; Blumenthal, D.J.

All-optical updating of subcarrier multiplexed headers and the simultaneous wavelength conversion of baseband payload is demonstrated. Updating is achieved by utilizing the low-pass frequency response of wavelength conversion via cross gain modulation in semiconductor optical amplifiers to suppress the original subcarrier multiplexed header while efficiently converting the baseband payload. A new header is then inserted by optically modulating the output of the wavelength converter with the new subcarrier encoded data. Updating of a pseudorandom 100 Mb/s header coded on a 16.5-GHz microwave subcarrier is achieved with wavelength conversion of a 2.5 Gb/s pseudorandom baseband payload. Crosstalk measurements are presented to determine cascadability of this technique and indicate that subcarrier suppression of 16.9 dBe followed by 20.2-dBe remodulation overcomes degradation due to residual original subcarrier and remodulation of the baseband payload. A key feature of this technique is the preservation of all-optical baseband payload transparency up to the header subcarrier frequency.

Published in:

Photonics Technology Letters, IEEE  (Volume:9 ,  Issue: 6 )