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Espoo, Finland

Luxdyne Ltd. | Date: 2010-01-20

An optical signal regeneration technique includes receiving optical symbols in a phase-modulation format. The received symbols are converted to symbols in a phase/amplitude-modulation format. A first amplitude regeneration, which involves reduction of amplitude noise, is applied to a first symbol pair. A modulation format conversion is performed on the optical signal in the phase/amplitude modulation format after the first amplitude regeneration. A second amplitude regeneration is applied to a second symbol pair, wherein the first and second symbol pairs differ from one another in respect of at least one different feature, which is selected from a group that includes a different nominal phase value assigned to the symbols of the symbol pair and a different temporal distance between the symbols of a symbol pair.

Tervonen A.,Luxdyne Ltd. | Tervonen A.,Aalto University | Mattila M.,Luxdyne Ltd. | Weiershausen W.,Luxdyne Ltd. | And 6 more authors.
European Conference on Optical Communication, ECOC | Year: 2010

A novel two-output PON amplifier is demonstrated to provide over 8-dB output power budget improvement over a conventional SOA, with negligible ASE noise. With an additional preamplifier it can accommodate up to 30 dB burst-to-burst power variation. ©2010 IEEE.

Von Lerber T.,TU Darmstadt | Von Lerber T.,Luxdyne Ltd. | Zogal K.,TU Darmstadt | Gierl C.,TU Darmstadt | And 4 more authors.
2011 IEEE International Topical Meeting on Microwave Photonics - Jointly Held with the 2011 Asia-Pacific Microwave Photonics Conference, MWP/APMP 2011 | Year: 2011

In this paper we discuss about the extended reach 10-Gbit/s Passive Optical Network (XGPON) and the use of a Saturated Collision Amplifier (SCA) for the up- and downstream extension. Especially the upstream amplification is challenging because of the used (i.e. standardized) wavelength and the bursty nature of the traffic. In order to benefit the SCA scheme, the Optical Network Units (ONUs) have to be equipped with low-cost DPSK transmitters. The use of widely tunable direct modulated VCSELs are proposed and discussed. © 2011 IEEE.

Chaouch H.,University of Arizona | Parsons E.,University of Arizona | Parsons E.,Tyco Electronics | Tervonen A.,Luxdyne Ltd. | And 10 more authors.
Optics Communications | Year: 2011

We demonstrate three novel all-optical signal processing methods for RZ-DPSK signals using a saturated SOA. The two logically opposite pulse streams from a demodulated noisy RZ-DPSK signal counter-propagate in the SOA. This configuration decreases the fluctuations in the demodulated marks while preventing the spaces from getting amplified. Photonic balancing provides functionality analogous to electrical balanced detection by reducing the required OSNR, and saturated asymmetric filtering removes the in-band ASE noise before detection. These methods are demonstrated experimentally by observing eye diagrams and BER measurements at 10.7 Gb/s and 22.3 Gb/s. © 2011 Elsevier B.V. All rights reserved.

Kueppers F.,University of Arizona | Parsons E.,University of Arizona | Chaouch H.,University of Arizona | Weiershausen W.,Luxdyne Ltd. | And 3 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

We present an optical receiver for RZ-DPSK signals that use photonic balancing. Photonic balancing is achieved through pulse counter-propagation and collision in a saturated SOA. We explain the principles of photonic balancing and show how it can lead to an improvement in RZ-DPSK detection by 3 dB, similar to electrical balancing. We also show how this scheme can be used as a Mamyshev-type regenerator. © 2009 Copyright SPIE - The International Society for Optical Engineering.

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