OPTICS 2013 Abstracts

Full Papers
Paper Nr: 2

Dispersion Analysis within a Measured 1,4 km MIMO Multimode Channel


Andreas Ahrens, Steffen Schröder and Steffen Lochmann

Abstract: In this contribution a signal theoretic Multiple Input Multiple Output (MIMO) system model for estimating modal and chromatic dispersion is developed. Based on channel measurements within a 1,4 km MIMO multimode channel parameters for modal and chromatic dispersion are estimated. Furthermore, taking given parameters of the dispersion into account, the introduced signal theoretic MIMO system model enables a reconstruction of the MIMO specific impulse responses.

Paper Nr: 3

Optical Couplers in Multimode MIMO Transmission Systems - Measurement Results and Performance Analysis


Andreas Ahrens and Steffen Lochmann

Abstract: The concept of MIMO (multiple input multiple output) transmission over multimode fibers has attracted increasing interest within the last years. Theoretically, the performance of the opticalMIMO multimode channel is well predictable. However, the realization of the opticalMIMO channel requires substantial further research. In this work the efficiency of optical couplers in MIMO systems is studied in a 1,4 km multimode testbed. Optical couplers have long been used as passive optical components able to combine or split SISO (singleinput single-output) data transmission from optical fibers. Our results show by the obtained measured impulse responses together with the simulated BER performance that optical couplers are well suited for the optical MIMO transmission despite their insertion losses and asymmetries. Comparing the different couplers those which maintain the different optical mode groups support the MIMO transmission more efficiently.

Short Papers
Paper Nr: 11

Experimental Distribution of OFDM-UWB Radio Signals along Directly Modulated Long-reach Pons Indicated for Sparse Geographical Areas


Tiago M. F. Alves and Adolfo V. T. Cartaxo

Abstract: The distribution of three orthogonal frequency division multiplexing (OFDM) ultra wideband (UWB) bands along directly modulated long-reach (LR) passive optical networks (PONs) is demonstrated experimentally. Adequate selection of the UWB signal applied to the directly modulated laser (DML) and fixed in-line optical dispersion compensation are shown as effective solutions to reach 130 km of standard single-mode fibre. In addition, error vector magnitude (EVM) levels compliant with the UWB standard are achieved for LR-PONs with reaches between 75 km and 130 km. It is also shown that, for optical channel spacing as narrow as 0.2 nm, the proposed system suffers from negligible linear inter-channel crosstalk as the EVM of the UWB bands transmitted in the central channel of a wavelength division multiplexing (WDM) signal consisting in three optical channels, is similar to the EVM of the UWB bands transmitted in that channel when single-channel operation is considered. These results demonstrate that the proposed directly modulated LR-PON is an adequate solution to deliver the UWB signals to users’ premises located in sparse take-up geographies.

Paper Nr: 10

Optical Parametric Gain of Tellutire/Phosphate Highly Nonlinear Optical Fiber


Edmund Samuel, Tong Hoang Tuan, Koji Asano, Takenobu Suzuki and Yasutake Ohishi

Abstract: We optimized the optical pump power to realize better phase-matching, higher parametric amplification gain and broader bandwidth for highly nonlinear optical fibers with tailored chromatic dispersions. The core-clad materials have large refractive index difference of 0.49. The gain bandwidth calculated are 108 and 104 nm for the step index and hybrid micorstructured optical fibers with two zero dispersion wavelengths respectively. The broadest bandwidth in our calculation is 108 nm for step index fiber at pump wavelength 1238 nm.