KEYWORDS: Polarization, Multiplexing, Fiber to the x, Single mode fibers, Signal attenuation, Modulation, WDM-PON, Reflectivity, Eye, Semiconductor optical amplifiers
A bidirectional and simultaneous transmission of Ethernet, FTTX services through single optical carrier wavelength employing polarization multiplexing technique in the transmitter end and the user end. 10 Gbps and 2.5 Gbps datarates are transmitted over 50 km single mode fiber employing POLMUX technique at OLT and ONU to provide Ethernet and FTTX services concurrently to the user. Reflective semiconductor optical amplifier is used to reuse and remodulate the downlink signal to uplink transmission. The upstream and the downstream transmission performances are observed by the bit error rate values and the eye diagrams obtained by the BER analyzer.
KEYWORDS: Single mode fibers, Channel projecting optics, Transmitters, WDM-PON, Radio over Fiber, Eye, Signal attenuation, Physics, Modulators, Modulation
A bidirectional ROF configuration has been proposed and developed to transmit 80 channels HDTV signal over 80 km SMF integrating mutually injection locking, optical carrier suppression (OCS) and remodulation techniques. LiNbO3 Mach-Zehnder modulator is used at transmitter end to realize the OCS scheme by mixing two complementary signals of 30GHz. RSOA is deployed at the user end to reuse and remodulate the downstream HDTV signal to upstream transportation over same 80km fiber link. The uplink and downlink transmission performances are observed and analyzed by excellent eye-diagram and low bit error rate values.
KEYWORDS: Single mode fibers, Polarization, WDM-PON, Multiplexing, Fiber to the x, Eye, Signal attenuation, Modulation, Reflectivity, Semiconductor optical amplifiers
In this paper a simple architecture has been developed for full-duplex transmission of different services
like Ethernet, FTTX etc through single optical carrier wavelength employing polarization multiplexing technique in
the transmitter end and the user end simultaneously. 10 Gbps and 2.5 Gbps datarates are bidirectionally transported
over 50 km single mode fiber (SMF) to provide Ethernet and FTTX services concurrently to the user. Reflective
semiconductor optical amplifier (RSOA) is used to reuse and remodulate the downlink signal to uplink transmission.
The upstream and the downstream transmission performances are observed by the bit error rate (BER) values and
the eye diagrams obtained by the BER analyzer at both ends.
KEYWORDS: Single mode fibers, Channel projecting optics, Eye, Radio over Fiber, Backscatter, Transmitters, Signal attenuation, Physics, Composites, Distortion
In this paper a novel architecture has been proposed and developed for full-duplex transmission of 80
channel CATV signal over 80 km single mode fiber (SMF) using various techniques such as mutually injection
locking, optical carrier suppression (OCS) and remodulation etc. The up/downlink transmission performances are
observed by the low bit error rate (BER) values and impressive eye diagrams. The satisfactory values of CNR, CBT
and CSO verify the successful transmission of CATV signals through our proposed configuration.
KEYWORDS: Free space optics, Radio optics, Digital filtering, Reflectors, Free space, Telecommunications, Single mode fibers, Radio over Fiber, Optical amplifiers, Amplifiers
A bidirectional radio over fiber (ROF) transport system in combination with optical free space transmission schemes based on WDM, external light injection and optical add-drop multiplexing techniques is proposed and demonstrated. A diverging lens at the fiber end and a parabolic reflector at the receiver end are designed to employ optical free space transmission scheme in the configuration which transmits data-stream of 1~10 Gbps at 12.5 GHz. Excellent BER values and impressive eye diagrams for both down/uplink have shown that our proposed system is convenient and suitable for 80 km optical and 10 m optical free space transmission.
A novel architecture of bidirectional wavelength division multiplexed passive optical network (WDM-PON), based on forward error correcting (FEC) scheme, has been proposed and analyzed theoretically. This configuration is made economical by employing injection locked Fabry-Perot laser diode (FPLD) for direct modulation at transmitter end and reflective semiconductor optical amplifier (RSOA) as remodulator at receiver end. Reed-Solomon (RS) codec is preferred in the design to comprehend the FEC scheme. The RS (255, 251) codec is realized by field-programmablegate- array (FPGA) with the help of VERILOG programming. Excellent transmission performances of 10 Gbps datasignal over maximum of 20 km SMF in downlink and uplink are obtained by the low bit error rate (BER) values and significant eye diagrams at BER analyzer.
We propose the use of square arrays of multiple atomic lenses, produced by interference of four nearly collinear optical beams in atom lithography using dipole force. Simulated lithographic patterns are reported for collimated as well as divergent rubidium atomic beam traveling in such square arrays of optical channels. The proposed configuration has the ability to write large numbers of periodic structures in square arrays in a single step.
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