This Optical Network Unit (ONU) for next-generation optical access networks (FTTH PONs) shifts the down-stream wavelength in the optical spectrum for remodulation at the Customer Premises and transmission in the up-stream direction.
The Challenge
is to avoid this impairment.
The Technology
The new ONU module reuses the down-stream wavelength and shifts it slightly in the optical spectrum to avoid the down/up spectral overlap, by means of an optical single-side band modulation governed by a radio-frequency tone. Next, the shifted wavelength is modulated with the up-stream data, and it is optically amplified for the optical transmission from the customer premises to the CO.
To perform these operations, the ONU is based on a combination of electro-optical devices as semiconductor optical amplifiers and electro-absorption modulators, arranged in dual Mach-Zehnder structure, with carrier suppression to avoid the spectral overlap.
Current stage of development
Experimental set-up and validity tests passed. Partial results published at Journal of Lightwave Technology, vol 27, no. 17, pp. 3912-3918.
Applications and Target Market
Broadband Telecom System Vendors Broadband Telecom Operators Semiconductor laser manufacturers Broadband Optical Communications networks: access, metropolitan, transport Fiber-to-the-Home networks Next Generation - Passive Optical Networks (NG-PON)
Innovative advantages
Enables efficient WDM PONs Wavelength-agnostic colorless ONU (identical ONUs).
Cancellation of the Rayleigh-scattering effect in the transmission system.
Cancellation of the effect of optical reflections in the transmission system.
Implementable with integrated optics.
Transparent to the bit rate and the code.
Down-stream wavelength reuse for up-stream transmission in the same fiber and the same wavelength.
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