For the first time, we propose a novel BER estimation algorithm for 8PSK signal, the idea of which is also applicable to
other multi-dimensional and multi-level modulation formats. And a 2 × 4 orthogonal optical label swapping based on
120Gb/s 8PSK payload and 78Mb/s ASK label by using optical switching devices is demonstrated. Through numerical
simulations under different circumstances, we get some orthogonal label switching network's characteristics by
analyzing the receiver BER utilizing the new BER algorithm, such as that different combination of label will have a
different impact on the transmission performance of the packets. In addition, by changing the receiver optical power,
transmitter optical power and optical power launched into the fiber, we get the system's receiver sensitivity, the optimum
transmitter power and optimum optical power injected into the fiber, which will be a reference for the actual systems'
design.
A simple and cost-effective technique to generate coherent optical multi-carriers by using cascaded phase modulators is
proposed and investigated. A detailed theoretical analysis is presented. The phase and amplitude relation of RF signals on
two concatenated phase modulators are investigated. Simulation results are in good agreement with the theoretical analysis,
and the experimental performance of 22 subcarriers with amplitude difference of 5dB shows that this scheme is a
promising technique for the coming Tb/s optical communication.
We propose algorithm to compensate frequency offset in optical coherent MSK system with little computation
requirement. Simulations are performed to demonstrate the algorithm and its performance is excellent.
For the first time, we propose and demonstrate a novel three-level Signal allocation scheme OFDM PON architecture
which makes the best use of OFDM characteristics. In the architecture, we produce five-carrier signal optically by MZM,
use odd carriers modulating downlink data and retain even carriers for uplink data. Multiple signal distribution methods
can be switched flexibly. By simulation, a small PON systems with four ONU based on this architecture was realized.
Both the downlink and uplink transmission adopt 4-QAM-OFDM signal. The transmission rate will be demonstrated to
exceed 10Gbit/s.
KEYWORDS: Tolerancing, Transmitters, Receivers, Modulation, Radio over Fiber, Signal detection, Telecommunications, Single sideband modulation, Phase shift keying, Signal to noise ratio
We propose and simulate a single-side band (SSB) Radio-over-Fiber ( RoF ) system based on OFDM-MSK
modulation. In-phase/quadrature-phase (IQ) imbalance effect can significantly degrade the system performance. In
order to obtain a better system performance, at the transmitter, the phase departure tolerance should be within 1 degree
and the amplitude departure tolerance should be within 5% in the electrical domain, the phase departure tolerance should
be within 10 degrees and the amplitude departure tolerance should be within 40% in the optical domain, the departure
tolerance of splitting ratio should be within ±12%, and at the same time, time misalignment should be within ±32ps. At
the receiver, the phase departure tolerance should be within 2 degrees and the amplitude departure tolerance should be
within 10%. Furthermore, it's further found that the electrical part of the transmitter presents a stricter requirement on the
IQ balance than the receiver, while the receiver presents a stricter requirement on the IQ balance than the optical part of
the transmitter.
In this paper, a dual-stage optical single sideband (DSSB) modulation scheme to combat chromatic dispersion for the
terahertz wave over fiber (ToF) systems application is proposed. In the scheme, terahertz(THz) wave is obtained via
carrier-suppression double sideband modulation, one sideband of terahertz wave then undergo the first single sideband
modulation and the second base band SSB modulation in the process of data modulation, which achieves cascade single
sideband (SSB) modulation. As can been seen from the simulation result, for mid-frequency carrier of 0.1THz, the BER
performance without dispersion compensation achieves 1x10-11 and the sensitivity of the receiver is -26.6dBm with a
data rate of 5Gb/s after 100km transmission. Through comparing the power penalty of double side band (DSB) and
DSSB, we demonstrated the optical DSSB modulation has better dispersion tolerance. This paper also shows the
contrastive curves of frequency selective fading for the SSB and DSB modulated signals, which definitely demonstrates
the existence of dispersion fading during the DSB transmission as well as the effective suppression of the fading
implemented by the SSB modulation. The novel scheme's preference is excelled than the conventional scheme's, which
is demonstrated by these theory and simulation.
In this paper, all-optical OFDM transmitter and receiver with 5×20Gbit/s were simulated. The 100-Gbits/s signal was
successfully transmitted over 40-km-SMF without dispersion companion in the simulation experiment. We have
analyzed the principle of orthogonal carrier generation, and obtained the optimal configuration for two, three and five
orthogonal carriers. Through designing proper system parameters, the clearly eye diagrams were obtained. The BER
curves of five orthogonal signals were detected.
A WDM PON(wavelength-division-multiplexed passive optical network) structure using 40Gb/s FSK signal for
downstream transmission and 10Gb/s orthogonal FSK/ASK re-modulated signal for upstream transmission is
demonstrated. In the downstream direction, a novel FSK modulation scheme based on phase-to-intensity
modulation conversion is adopted to generate a FSK signal at 40Gb/s, while orthogonal modulation format is used
in the upstream transmission. The performance of the system is studied both with and without scattering. Simulation
results show that the PON system can transmit for more than 20km, which is a promising candidate for future highspeed
access network.
We propose and experimentally demonstrate a novel architecture for OFDM-PON system. The down link is based on
single side band OFDM modulation while the up link makes use of the carrier information retained in another side band
to intensity modulate the data. The downstream transmission will be demonstrated experimentally to exceed 10Gb/s
using 4-QAM while the upstream transmission will exceed 2.5-Gb/s using ASK modulation and Time Division Multiple
Access (TDMA). This architecture can perfectly overcome the Rayleigh scattering effect. It has been proved the
transmission for both directions can reach 10km without bit error. And if the scattering effect is considered, the power
penalty will be less than 0.8dB for downlink and 1.8dB for uplink.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.