Recently, as effective demand for high-quality, large-capacity content such as three-dimensional ... more Recently, as effective demand for high-quality, large-capacity content such as three-dimensional (3D), multiangle, and gigabit-web has increased, a network infrastructure capable of satisfying future broadcast and communication service requirements is required. In this paper, we introduce a convergence service based on a gigabit network and then propose a technique for delivering gigabit 3D content. Here, the term 3D content delivery technique refers to an overlay-multicast-based distributed service platform that is comprised of a media relay agent and a management server. The service platform is designed to back up both live video and file-based video streaming. Using this platform, we can provide 3D remote education and 3D multiangle services via 3D-based video streaming between a service provider and service consumers dispersed at different locations. To evaluate our 3D content delivery technique, we run a series of trials of gigabit network-based 3D trial services to service subscribers. Then, we conduct a survey to measure user satisfaction with the 3D delivery service and simulated network and service quality. From experimental results, we confirm that this type of distributed service platform can be used as the delivery framework for applications such as realistic 3D-based seminars or 3D video conferences.
A novel device that converts the order of modes in an integrated-optic multimode waveguide was pr... more A novel device that converts the order of modes in an integrated-optic multimode waveguide was proposed and fabricated. The device consists of two mode splitters and tapered waveguides. Its operation at a wavelength of 1.55 microm was confirmed by observation of the output mode profiles. The cross talk measured by an indirect method was >10.2 dB. The excess loss with reference to a straight multimode waveguide was 1.5 dB, compared with the propagation loss of a straight multimode waveguide.
Polymeric large-core (47 µm × 41 µm) optical waveguides for optical interconnects have been fabri... more Polymeric large-core (47 µm × 41 µm) optical waveguides for optical interconnects have been fabricated by using a rubber molding process. For low-cost low-loss large-core waveguides, our newly developed thick-photoresist patterning process is used for a master fabrication. Also a low-loss thermocurable polymer, perfluorocyclobutane (PFCB), is used in fabricating optical waveguides by rubber molding for the first time. The propagation loss is measured to be 0.4 dB/cm at the wavelength of 1.3 µm, and 0.7 dB/cm at the wavelength of 1.55 µm.
Remote faulty terminal detection method in the timedivision-multiplexing passive optical networks... more Remote faulty terminal detection method in the timedivision-multiplexing passive optical networks is crucial, especially for the time-slot-violated faulty terminals. We previously demonstrated a detection method using a periodic probing signal. In this paper, we explain the method in details and analyze its performance limitation in multiple terminal cases to evaluate the validity scope of this method. Using a random process model, we show that the proposed method can detect the probing signal even though there is one 15-dB-stronger pseudorandom-binary-sequence bitstream (PRBS)-type faulty signal using a receiver with the bandpass filter's bandwidth below 0.47 MHz . This result shows that the proposed method can be useful for the current 1 Gbps gigabit-capable passive optical network (G-PON) and ethernet PON (E-PON) standards.
A cost-effective self-amplified network in a Gigabit-Ethernet passive optical network is demonstr... more A cost-effective self-amplified network in a Gigabit-Ethernet passive optical network is demonstrated using 8B10B line coding properties. We explain the operational principles and experimental results including transmitter and receiver margin for an upstream channel.
A novel fiber-in-line optical transceiver structure by focusing the outgoing radiation from a til... more A novel fiber-in-line optical transceiver structure by focusing the outgoing radiation from a tilted and chirped fiber Bragg grating is proposed. The chirped gratings with 45° tilted angle is designed for an optimum input coupling at 1.55 μm and a FDTD method is used for analysis. Experimental results on beam focusing are shown. We expect this novel design can be used for a low-cost receiver in the bi-directional fiber-in-line optical transceiver.
A cost-effective and compact WDM-PON source amplification scheme with bidirectional semiconductor... more A cost-effective and compact WDM-PON source amplification scheme with bidirectional semiconductor optical amplifier is firstly demonstrated. A linear optical amplifier is used as a bidirectional amplifier to obtain the gain clamping of downstream channels and suppress the cross-gain modulation between upstream and downstream channels. We show the experimental results including the transient responses with a dynamic wavelength channel add/drop in WDM-PON.
A cost-effective self-amplified network in a Gigabit-Ethernet passive optical network is demonstr... more A cost-effective self-amplified network in a Gigabit-Ethernet passive optical network is demonstrated using 8B10B line coding properties. We explain the operational principles and experimental results including transmitter and receiver margin for an upstream channel.
A novel fiber-in-line optical transceiver structure by focusing the outgoing radiation from a til... more A novel fiber-in-line optical transceiver structure by focusing the outgoing radiation from a tilted and chirped fiber Bragg grating is proposed. The chirped gratings with 45° tilted angle is designed for an optimum input coupling at 1.55 μm and a FDTD method is used for analysis. Experimental results on beam focusing are shown. We expect this novel design can be used for a low-cost receiver in the bi-directional fiber-in-line optical transceiver.
A cost-effective and compact WDM-PON source amplification scheme with bidirectional semiconductor... more A cost-effective and compact WDM-PON source amplification scheme with bidirectional semiconductor optical amplifier is firstly demonstrated. A linear optical amplifier is used as a bidirectional amplifier to obtain the gain clamping of downstream channels and suppress the cross-gain modulation between upstream and downstream channels. We show the experimental results including the transient responses with a dynamic wavelength channel add/drop in WDM-PON.
Recently, as effective demand for high-quality, large-capacity content such as three-dimensional ... more Recently, as effective demand for high-quality, large-capacity content such as three-dimensional (3D), multiangle, and gigabit-web has increased, a network infrastructure capable of satisfying future broadcast and communication service requirements is required. In this paper, we introduce a convergence service based on a gigabit network and then propose a technique for delivering gigabit 3D content. Here, the term 3D content delivery technique refers to an overlay-multicast-based distributed service platform that is comprised of a media relay agent and a management server. The service platform is designed to back up both live video and file-based video streaming. Using this platform, we can provide 3D remote education and 3D multiangle services via 3D-based video streaming between a service provider and service consumers dispersed at different locations. To evaluate our 3D content delivery technique, we run a series of trials of gigabit network-based 3D trial services to service subscribers. Then, we conduct a survey to measure user satisfaction with the 3D delivery service and simulated network and service quality. From experimental results, we confirm that this type of distributed service platform can be used as the delivery framework for applications such as realistic 3D-based seminars or 3D video conferences.
A novel device that converts the order of modes in an integrated-optic multimode waveguide was pr... more A novel device that converts the order of modes in an integrated-optic multimode waveguide was proposed and fabricated. The device consists of two mode splitters and tapered waveguides. Its operation at a wavelength of 1.55 microm was confirmed by observation of the output mode profiles. The cross talk measured by an indirect method was >10.2 dB. The excess loss with reference to a straight multimode waveguide was 1.5 dB, compared with the propagation loss of a straight multimode waveguide.
Polymeric large-core (47 µm × 41 µm) optical waveguides for optical interconnects have been fabri... more Polymeric large-core (47 µm × 41 µm) optical waveguides for optical interconnects have been fabricated by using a rubber molding process. For low-cost low-loss large-core waveguides, our newly developed thick-photoresist patterning process is used for a master fabrication. Also a low-loss thermocurable polymer, perfluorocyclobutane (PFCB), is used in fabricating optical waveguides by rubber molding for the first time. The propagation loss is measured to be 0.4 dB/cm at the wavelength of 1.3 µm, and 0.7 dB/cm at the wavelength of 1.55 µm.
Remote faulty terminal detection method in the timedivision-multiplexing passive optical networks... more Remote faulty terminal detection method in the timedivision-multiplexing passive optical networks is crucial, especially for the time-slot-violated faulty terminals. We previously demonstrated a detection method using a periodic probing signal. In this paper, we explain the method in details and analyze its performance limitation in multiple terminal cases to evaluate the validity scope of this method. Using a random process model, we show that the proposed method can detect the probing signal even though there is one 15-dB-stronger pseudorandom-binary-sequence bitstream (PRBS)-type faulty signal using a receiver with the bandpass filter's bandwidth below 0.47 MHz . This result shows that the proposed method can be useful for the current 1 Gbps gigabit-capable passive optical network (G-PON) and ethernet PON (E-PON) standards.
A cost-effective self-amplified network in a Gigabit-Ethernet passive optical network is demonstr... more A cost-effective self-amplified network in a Gigabit-Ethernet passive optical network is demonstrated using 8B10B line coding properties. We explain the operational principles and experimental results including transmitter and receiver margin for an upstream channel.
A novel fiber-in-line optical transceiver structure by focusing the outgoing radiation from a til... more A novel fiber-in-line optical transceiver structure by focusing the outgoing radiation from a tilted and chirped fiber Bragg grating is proposed. The chirped gratings with 45° tilted angle is designed for an optimum input coupling at 1.55 μm and a FDTD method is used for analysis. Experimental results on beam focusing are shown. We expect this novel design can be used for a low-cost receiver in the bi-directional fiber-in-line optical transceiver.
A cost-effective and compact WDM-PON source amplification scheme with bidirectional semiconductor... more A cost-effective and compact WDM-PON source amplification scheme with bidirectional semiconductor optical amplifier is firstly demonstrated. A linear optical amplifier is used as a bidirectional amplifier to obtain the gain clamping of downstream channels and suppress the cross-gain modulation between upstream and downstream channels. We show the experimental results including the transient responses with a dynamic wavelength channel add/drop in WDM-PON.
A cost-effective self-amplified network in a Gigabit-Ethernet passive optical network is demonstr... more A cost-effective self-amplified network in a Gigabit-Ethernet passive optical network is demonstrated using 8B10B line coding properties. We explain the operational principles and experimental results including transmitter and receiver margin for an upstream channel.
A novel fiber-in-line optical transceiver structure by focusing the outgoing radiation from a til... more A novel fiber-in-line optical transceiver structure by focusing the outgoing radiation from a tilted and chirped fiber Bragg grating is proposed. The chirped gratings with 45° tilted angle is designed for an optimum input coupling at 1.55 μm and a FDTD method is used for analysis. Experimental results on beam focusing are shown. We expect this novel design can be used for a low-cost receiver in the bi-directional fiber-in-line optical transceiver.
A cost-effective and compact WDM-PON source amplification scheme with bidirectional semiconductor... more A cost-effective and compact WDM-PON source amplification scheme with bidirectional semiconductor optical amplifier is firstly demonstrated. A linear optical amplifier is used as a bidirectional amplifier to obtain the gain clamping of downstream channels and suppress the cross-gain modulation between upstream and downstream channels. We show the experimental results including the transient responses with a dynamic wavelength channel add/drop in WDM-PON.
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Papers by Byung-Tak Lee