The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Flexible optical networking is identified today as the solution that offers smooth system upgradability towards Tb/s capacities and optimized use of network resources. However, in order to fully exploit the potentials of flexible spectrum allocation and networking, the development of a flexible switching node is required capable to adaptively add, drop and switch tributaries with variable bandwidth...
Radio over fibre (RoF) system and orthogonal frequency division multiplexing (OFDM) have attracted much interest for increasing the capacity and coverage area for future broadband wireless millimetre waves (mm-waves) at 60GHz [1, 2]. Fast OFDM (F-OFDM), another promising multicarrier scheme, reduces the subcarrier spacing to half of symbol rate per subcarrier [3]. When compared to the conventional...
We demonstrate the first experimental implementation of intensity-modulation and direct-detection 7.6Gb/s DBPSK-based DSB optical Fast-OFDM with a reduced subcarrier spacing equal to half of the symbol rate per subcarrier over 40km SMF.
We propose a novel method to achieve precise symbol synchronization using one training symbol in DSB optical fast OFDM (FOFDM). World-first FOFDM transmission experiment using field-installed fiber verifies its robustness to the noise and CD.
We propose symmetric extension based guard interval (GI) to enable CD compensation with one-tap equalizers after discrete-cosine transform in optical fast-OFDM, and experimentally demonstrate 20Gbit/s 4-ASK transmission over 124km field-installed SMF with varied GI length.
We propose full-field detection based multi-chip MLSE to improve the receiver sensitivity, CD tolerance, and flexibility of the AMZI delay of the offset-DQPSK format, while retaining the simplicity of its pre-coder and single-AMZI demodulator.
In this paper, we review emerging technologies to build up Tb/s per channel transmission capacity. The different approaches, mainly based on various implementations of orthogonal frequency division multiplexing, Nyquist wavelength division multiplexing and optical time division multiplexing, are introduced and compared with respect to complexity, spectral efficiency and transmission reach. In addition...
We propose a novel discrete-cosine-transform based optical fast OFDM (FOFDM) to reduce the channel spacing to half of the symbol rate per carrier, and numerically evaluate the performance of 20Gbaud PSK and bipolar 4-ASK FOFDM.
In this presentation we will discuss recent advances in adaptive modulation schemes for ultra high bit capacity optical networks. This paper focuses on optimising the sub-carrier spacing for such high capacity networks.
In this paper we investigate the non-linear transmission performance of 40 Gsymbol/s multi-carrier techniques, specifically coherent WDM (CoWDM) for a variety of existing dispersion maps. Whilst the simulations on this paper were performed using NRZ OOK CoWDM implementation, the conclusions are also applicable to other multi-carrier techniques, such as OFDM.
A monolithic integrated three-section amplified feedback semiconductor laser (AFL) is demonstrated as an all optical clock regenerator. All optical clock recovery for 40Gb/s is demonstrated experimentally using AFL.
We propose a new metric to significantly simplify 4-state full-field maximum likelihood sequence estimation, demonstrate its use in a 372 km field-installed fiber transmission experiment without performance degradation, and investigate the influence of critical system parameters.
We propose a novel field-detection based maximum likelihood sequence estimation (FD-MLSE), and experimentally demonstrate transmission over 372 km of field-installed SMF without optical dispersion compensation using a 4-state MLSE.
Accessing the full optical field with the addition of only a single AMZI and photodiode to the receiver enhances the reach of receiver side electronic dispersion compensation to 2160 km without the complexity of coherent detection.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.