We design a highly stable DFB laser source, with the 15-minute stability of the output optical power up to ± 0.0012 dB and the 8-hour stability up to ± 0.006 dB at 1310 nm.
In the visible light communication, the white LED bandwidth severely limits the transmission rate of information. This paper presents an analog pre-equalization technology to compensate for the bandwidth of white LED. The technology not only can debug according to the actual channel changing, but also avoid the high costs of using FPGA technology. The pre-equalization technology is implemented by an analog circuit of tapped-delay-line, in the circuit we select an appropriate delay line and a digital to analog converter. In our LED visible light communication system, we can achieve a bandwidth of 150MHz,which was proved theoretically in the paper.
Compared to other digital equalizers, MLSE (maximum likelihood sequence estimator) equalizer seem to be the most
promising candidate solution to mitigate impairments caused by CD, PMD and fiber's nonlinearity. A novel MLSE
equalizer technology combined with FFE based on nonlinear Volterra theory is investigated, which shows superior
performance for joint compensation of all distortion effects in uncompensated 40Gbit/s Pol-Mux RZ-DQPSK optical
transmission system. The receiver can achieve a long haul transmission with 280 km without any optical dispersion
compensation.
A novel scheme that employing the coherent receiver in atmospheric laser communication system was proposed in this
paper. DPSK format modulation is adopted to overcome atmospheric turbulence and multipath fading. Coherent receiver
is used to improve system's sensitivity. Testing bed was setup and eye diagram can be measured. Real time BER would
be measured soon.
The optical transmission system is being upgraded from 10G to 40G even 100G due to the increasing demands of
wide-bandwidth network. We numerically investigate the nonlinear tolerance of 112 Gb/s polarization-multiplexed
return-to-zero differential quadrature phase-shift keying signal with different types of neighboring channels on a 50-GHz
grid over 1,000 km field fiber. Our transmission result proves showing the feasibility of 100G overlaying existing 10G/40G
commercial systems despite the presence of strong cross-phase modulation.
White light-emitting diodes (LEDs) are becoming widely used in both illumination and communication applications. In
this paper, a visible light communication system is described, which employs blind equalization schemes at the receiver.
The blind equalization schemes can both improve the data transmission bandwidth significantly and compensate the
signal distortion dynamically. Off-line analysis shows the eye-diagram is observably improved at 10 Mb/s operations
using 1 MHz bandwidth white-light LED.
KEYWORDS: Polarization, Signal detection, Digital signal processing, Telecommunications, Multiplexing, Demultiplexers, Modulation, Eye, Control systems, Beam splitters
A novel scheme for automatic demultiplexing used the partial low frequency radio frequency (RF) power as control
signals for polarization division multiplexed (PDM) system is proposed firstly. The spectrum of detected signals, which
is sensitive to the angle between polarization controller (PC) and the polarization beam splitter (PBS), are thoroughly
analyzed. The effectiveness of this demultiplexing method is experimentally demonstrated.
KEYWORDS: Digital signal processing, Polarization, Telecommunications, Analog electronics, Dispersion, Automatic control, Signal detection, Modulation, Polarimetry, Integrated optics
Polarization mode dispersion is considered to be one of the main obstacles for high speed long-haul optical fiber
communication systems. It is necessary to realize PMD monitoring. This paper theoretically analyzed the principle of
polarization mode dispersion monitoring with degree of polarization as monitoring signal. Using the degree of
polarization method, the scheme of DSP based high precision real-time inline PMD monitoring is designed and
implemented. An experiment system is set up to monitor polarization mode dispersion of 40Gbit/s DQPSK system. The
experiment results show that the range of input optical power is -20~0dBm, the response time is 1μs and the states of
polarization accuracy degree is 1%. It has high sensitivity and can be used in a variety of modulation formats and it is
independent of optical signal rate.
We propose and demonstrate a 10Gb/s bidirectional reflective semiconductor optical amplifier (R-SOA) based
wavelength-division-multiplexing passive optical network (WDM-PON) utilizing a DPSK signal for down-link and an
OOK signal re-modulated for up-link. The eye diagram and the penalty of max eye opening factor (EOP) performance of
our simulation results show that the performance of our scheme is as good as those in case of continuous wave(CW) light
injected R-SOA. So our scheme is a practical solution to meet the data rate and cost-efficient of the optical links
simultaneously in tomorrow's WDM-PON access networks.
A new algorithm to implement dynamic bandwidth allocation in Gigabit-capable passive optical network is
proposed. This algorithm can support five types of T-CONT and assure protection and fairness characteristics as to
bandwidth allocation. A computer simulation result is shown that the new algorithm has good performance.
A detailed management system implementation process for a realized reconfigurable optical add-drop multiplexer (ROADM) is presented. The ROADM is capable of freely adding/dropping any of 40 wavelengths within C-band at ITU_T standard spacing according to the user's configuration demand from the management system. SNMP and Java
language are used in the deployment of the management system. The management system framework and its implementation process are introduced in template-based form, so they are generic enough to be deployed in managing such reconfigurable elements in optical transport network, and be of value to others who are contemplating managing such kind of reconfigurable elements.
An algorithm is presented in this paper to implement Dynamic Bandwidth Allocation of Gigabit-capable Passive Optical Network(GPON) which is one of the key technologies in GPON, and simulation result is shown to demonstrate the algorithm’s performance.
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