A method and apparatus for bidirectional optical link using a single optical carrier and colorless demodulation and detection of optical frequency shift keyed data have been developed and patented. Partners to further develop the system and/or to establish commercial agreements along with technical cooperation are sought.
The Challenge
is to implement the concept of “Wavelength-to-the-Home TTH”.
To enable this, the key element is the optical network unit (ONU) at the customer premises equipment (CPE), that should comply with several challenges: wide bandwidth (1 to 10 GHz modulation, more than 30 nm optical), bidirectional for down- and up-stream transmission, wavelength agnostic (colorless) so any CPE being able to any operate at any wavelength channel, competitive cost in the access sector and integrated in semiconductor photonic circuits.
The Technology
The ONU is the main objective of the present invention and holds a technique for demodulation and detection of optical frequency modulated downstream signals, enabling remodulation of the downstream signal with upstream data. This is achieved by means of a colorless amplifier, demodulator and detector, which provides the functionality of a periodic filtering device for demodulation of the downstream, and also a detection capability. This periodic transfer function is obtained by an optical cavity, formed by a SOA (semiconductor optical amplifier), EAM (electro-absorption modulator) and mirrors, and allows for wavelength-independent operation on a given wavelength grid, such as the ITU WDM wavelength grid.
Current stage of development
Prototype with SOA-EAM integrated and validity tests passed. Experimental results published at: IEEE Photonics Technology Letters, vol. 22, no. 13, pp.1002-1004, July 2010.
Applications and Target Market
Broadband Telecom System Vendors Manufacturers of lasers and active semiconductors optical devices.
Broadband Optical Communications networks: access, metropolitan, transport.
Fiber-to-the-Home networks Next Generation - Passive Optical Networks (NG-PON) Optical signal processing
Innovative advantages
Single photonic integrated device for a WDM access network ONU Optical Frequency demodulation (oFSK) Intrinsic remodulation for up-stream transmission Optical Amplification High speed (e.g. 10 GBit/s)
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