Online ISSN
1751-8776
Print ISSN
1751-8768
IET Optoelectronics
Volume 2, Issue 4, August 2008
Volumes & issues:
Volume 2, Issue 4
August 2008
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- Author(s): A. Carena ; V. Curri ; R. Godoy ; J. Marco
- Source: IET Optoelectronics, Volume 2, Issue 4, p. 143 –147
- DOI: 10.1049/iet-opt:20070092
- Type: Article
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p.
143
–147
(5)
The authors investigate the optimal bandwidths for transmitter and receiver filters for differential phase-shift keying (DPSK) and differential quadrature phase-shift keying (DQPSK) optical modulation in dense wavelength-division multiplexing (WDM) scenarios. Single-channel setups were investigated as reference. Simultaneously, the optimal free spectral range (FSR) of the delay interferometer (DI) needed at the receiver for both modulation formats was searched. Transmitter (Tx) and receiver (Rx) optimal setups were focused and the propagation effects were not considered. It is demonstrated that the optimal FSR, in general, is larger than the symbol rate for both DPSK and DQPSK modulation formats. - Author(s): A.P.S. Ferreira ; T.G. Silveira ; P.M.N.P. Monteiro ; R.F.G.S. Ribeiro
- Source: IET Optoelectronics, Volume 2, Issue 4, p. 148 –157
- DOI: 10.1049/iet-opt:20070017
- Type: Article
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p.
148
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The use of return-to-zero (RZ) formats is proposed to enhance the dispersion tolerance of intensity-modulated carrier-unsuppressed (IM-CUs) optical single sideband (oSSB) systems. The performance of these systems, employing electrical dispersion compensation (EDC), is accessed using unipolar and polar RZ signalling formats, and compared with common non-return-to-zero (NRZ). Simulation results at 10.7 Gb/s reveal that oSSB systems with EDC using both NRZ and unipolar RZ signalling formats are limited to low extinction ratio (ER) values. However, the use of polar RZ allows increased ER and transmission distances, because of higher inter-symbol interference tolerance and the absence of discrete spectral tones. Considering a minimum ER of 9 dB and resort to forward error correction schemes, polar RZ allows single-channel error free transmission over 1400 km of standard single‐mode fibre, substantially improving the 980 km obtained for NRZ with ER of 6 dB. Dense wavelength‐division multiplexing transmission was also assessed, retrieving improved resilience of IM-CUs oSSB polar RZ. - Author(s): P. Sarrafi ; N. Zareian ; K. Mehrany
- Source: IET Optoelectronics, Volume 2, Issue 4, p. 158 –164
- DOI: 10.1049/iet-opt:20080009
- Type: Article
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p.
158
–164
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A new strategy for radiation loss reduction in curved slab waveguides is presented. The proposed strategy is based on the proper modification of the boundary conditions at the core-to-cladding interface, whereupon extremely thin conductive nanolayers with non-zero surface conductance are imposed. The obtained numerical results show a noticeable decrease in the overall loss level. - Author(s): E. Cassan ; D. Bernier ; X.L. Roux ; D. Marris-Morini ; L. Vivien
- Source: IET Optoelectronics, Volume 2, Issue 4, p. 165 –171
- DOI: 10.1049/iet-opt:20070069
- Type: Article
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p.
165
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Performances and metrics of an electro-optical wavelength switch in silicon–on- insulator technology using a 20 µm long photonic crystal directional coupler structure are theoretically studied using both electrical and finite difference time domain simulations. The possibility of photonic switching through carrier injection using a forward-biased PIN diode configuration is evaluated. It is shown that wavelength routing near λ=1550 nm with optical insertion loss of 1 dB and an electrical cut-off frequency of 60 MHz can be achieved with a bias voltage of 1 V and a dissipated electrical power of 700 µW. Integration of the device could be applied to active routing of light in silicon chips for the realisation of on-chip switching networks.
Simultaneous optimisation of filter bandwidths and interferometer free spectral range for DPSK and DQPSK modulation
Use of return-to-zero formats in electrical dispersion compensated optical single sideband transmission systems
Greatly reduced radiation loss in planar waveguides with two-dimensional conducting interfaces
Compact carrier-injection photonic crystal switch for on-chip communications
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