Browsing by Author "Peng, PC"

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1.3 mu m quantum dot vertical-cavity surface-emitting laser with external light injection
(2005-10-27)
Peng, PC
;
Chang, YH
;
Kuo, HC
;
Tsai, WK
;
Lin, G
A 1.3 mu m quantum dot vertical-cavity surface-emitting laser (QD VCSEL) with external light injection is presented, having been experimentally demonstrated. The QD VCSEL is fabricated on GaAs substrate. The 3 dB frequency response of the QD VCSEL based on the TO-Can package is enhanced from the free-running 1.75 to 7.44 GHz with the light injection technique.
A cost-effective fast frequency-hopped code-division multiple-access light source using self-seeded Fabry-Perot laser with fiber Bragg grating array
(2004-11-01)
Peng, WR
;
Peng, PC
;
Lin, WP
;
Hsu, KC
;
Lai, YC
We propose a novel light source for the optical fast frequency-hopped code-division multiple-access scheme using a self-seeded gain-switched Fabry-Perot laser diode (FP-LD) with the reconfigurable fiber Bragg grating array (FBGA). The embedded FBGA in the external cavity loop encodes the input pulses both temporally and spectrally. Before feeding back into the FP-LD, the encoded optical pulses propagate the FBGA with reverse direction and are again temporally combined. With the corporation of the variable fiber delay line, the limitation of the pulse rate by the fixed external cavity length is removed and makes the scheme more flexible. The output with sidemode suppression ratio of more than 20 dB has been obtained. With three fiber Bragg gratings on the FBGA, we demonstrate the encoded chip rate of 1.425 GHz under the driving radio frequency of 475 MHz. It is proved that a different codeword can be generated by simply reconfiguring the encoder without changing the rest of the experimental setup.
A hybrid star-ring architecture for fiber Bragg grating sensor system
(2003-09-01)
Peng, PC
;
Tseng, HY
;
Chi, S
;
光電工程學系
;
Department of Photonics
In this letter, we present a hybrid star-ring architecture for a highly reliable fiber Bragg grating (FBG) sensor system and demonstrate its effectiveness. The main trunk of the proposed sensor network is star topology and the sensing branches comprise a series of concatenated ring subnets. The weakness in reliability of the star network is overcome by the ring subnets with a self-healing function based on the reconfigurable optical switches between each subnet. To enhance the signal-to-noise ratio (SNR) of the sensor system, we adopt a linear-cavity FBG laser scheme to construct our proposed hybrid star-ring architecture. Such a fiber-laser scheme results in the SNR over 48 dB for the sensor network. The network survivability of a ten-point FBG sensor is experimentally examined. It is shown that the proposed FBG sensor system can increase the reliability of a sensing network.
A novel fiber-laser-based sensor network with self-healing function
(2003-02-01)
Peng, PC
;
Tseng, HY
;
Chi, S
;
光電工程學系
;
Department of Photonics
In this letter, we, present a novel fiber-laser-based sensor network. with self-healing. function and demonstrate its effectiveness. The network survivability and capacity for a multipoint sensor system ate enhanced by adding switches in a self-healing ring architecture. The fiber laser adopted in this system is a linear-cavity filter Bragg grating (FBG) laser leading to the signal-to-noise ratio. over 52 dB for the sensor network. The network survivability of a ten-point FBG sensor is experimentally examined. The experimental results show that the proposed system can facilitate reliable, sensing network for a large-scale and multipoint smart structure.
A simple fiber-Bragg-grating sensor system based on a linear-cavity fiber laser
(2003-04-05)
Peng, PC
;
Tseng, HY
;
Chi, S
;
光電工程學系
;
Department of Photonics
A simple fiber-Bragg-grating (FBG) sensor system based on a linear-cavity fiber laser is proposed and experimentally demonstrated. The lasing wavelength shift resulting from the temperature variation on this sensing element is discriminated by two FBGs. These two FBGs, acting as wavelength discriminators, are used to increase the real-time measurement range for monitoring the temperature variation. (C) 2003 Wiley Periodicals, Inc.
A tunable dual-wavelength erbium-doped fiber ring laser using a self-seeded Fabry-Perot laser diode
(2003-05-01)
Peng, PC
;
Tseng, HY
;
Chi, S
;
光電工程學系
;
Department of Photonics
A tunable dual-wavelength erbium-doped fiber ring laser using a self-seeded Fabry-Perot laser diode (FP-LD) is proposed and demonstrated. By adding an FP-LD incorporated with a tunable bandpass filter within the ring cavity, the fiber laser can lase two wavelengths simultaneously because of the self-seeded mechanism. This dual-wavelength output exhibits a good performance having the optical side-mode suppression ratio over 31 dB. The wavelength-tuning range of this tunable dual-wavelength fiber laser can be up to 9 nm.
Dynamic characteristics of long-wavelength quantum dot vertical-cavity surface-emitting lasers with light injection
(2006-04-03)
Peng, PC
;
Kuo, HC
;
Tsai, WK
;
Chang, YH
;
Lin, CT
This investigation experimentally demonstrates the dynamic characteristics of quantum dot vertical-cavity surface-emitting lasers (QD VCSEL) without and with light injection. The QD VCSEL is fully doped structure on GaAs substrate and operates in the 1.3 mu m optical communication wavelength. The eye diagram, frequency response, and intermodulation distortion are presented. We also demonstrate that the frequency response enhancement by light injection technique allows us to improve the performance of subcarrier multiplexed system. (c) 2006 Optical Society of America.
Dynamic encoder/decoder based on fiber Bragg gratings for optical security system
(2004-12-01)
Peng, PC
;
Peng, WR
;
Lin, WP
;
Chi, S
;
光電工程學系
A novel dynamic encoder/decoder based on fiber Bragg gratings for optical security systems is presented in this paper. The encoded and decoded optical communication signals can be realized by controlling the optical switches and fiber Bragg grating arrangement. We describe the system operation principle and set up an experimental encoder/decoder to demonstrate the feasibility of the proposed scheme.
Fiber-ring laser-based fiber grating sensor system using self-healing ring architecture
(2002-12-20)
Peng, PC
;
Tseng, HY
;
Chi, S
;
光電工程學系
;
Department of Photonics
This paper presents a self-healing fiber grating sensor system and demonstrates its effectiveness. The self-healing function is constructed by using a primary ring architecture incorporated with several ring sub-networks. To enhance the sensing signal when a breakpoint suddenly occurs in the network, we employ a fiber-ring laser-based sensor system. The network survivability of an 11-point FBG sensor is experimentally examined. The proposed fiber grating sensor system can increase the reliability of a sensing network. (C) 2002 Wiley Periodicals, Inc.
Generation of wavelength-tunable optical pulses using a linear-cavity fiber laser scheme with a Fabry-Perot laser diode
(2004-04-01)
Peng, PC
;
Lin, JH
;
Chi, S
;
光電工程學系
;
Department of Photonics
A wavelength-tunable mode-locked linear-cavity fiber laser was demonstrated using a Fabry-Perot laser diode. By adding a tunable bandpass filter within the linear cavity, the wavelength-tunable fiber laser was easy to be tuned dynamically. This linear-cavity fiber laser output exhibited a good performance having the optical sidemode suppression ratio over 30 dB and the wavelength-tuning range up to 27 nm. Furthermore, this fiber laser generated pulses with pulsewidth between 53.2 and 80.4 ps at a repetition frequency of 908.39 MHz.
Generation of wavelength-tunable optical pulses using EDFA as external-injection light source and amplifier for Fabry-Perot laser diode
(2004-11-01)
Peng, PC
;
Peng, WR
;
Lin, JH
;
Lin, WP
;
Chi, S
We propose and experimentally demonstrate a system for the generation of wavelength-tunable pulses using a gain-switched Fabry-Perot laser diode (FPLD) and an erbium-doped fiber amplifier (EDFA). The EDFA is used as both an external-injection light source and an amplifier for the FPLD. The wavelength tuning is achieved by a tunable filter. The optical sidemode suppression ratio of this system is better than 32 dB over the wavelength-tunable range of 34.5 nm. Moreover, the repetition frequency is 2000 MHz, and the pulsewidth is between 49.3 and 65.3 ps. The whole system is simple and can be easily constructed.
High-resolution fiber Bragg grating sensor system using linear-cavity fiber laser scheme
(2002-09-05)
Peng, PC
;
Tseng, HY
;
Chi, S
;
光電工程學系
;
Department of Photonics
A high-resolution fiber Bragg grating (FBG) sensor system using a linear-cavity fiber laser scheme is proposed and numerically studied. The proposed sensor system can improve the sensing accuracy by using a discriminating FBG pair in conjunction with a fiber laser scheme. This FBG sensor system can resolve the temperature up to 0.0005degreesC theoretically and can be applied for strain sensing and temperature sensing with high precision. (C) 2002 Wiley Periodicals, Inc.
Intensity and wavelength-division multiplexing FBG sensor system using a tunable multiport fiber ring laser
(2004-01-01)
Peng, PC
;
Lin, JH
;
Tseng, HY
;
Chi, S
;
光電工程學系
We propose an intensity and wavelength-division multiplexing (IWDM) fiber Bragg grating (FBG) sensor system using a tunable multiport fiber ring laser. The different output powers of a multiport fiber laser are used to address the information reflected from the sensing FBGs, even if the Bragg wavelengths of the FBGs connected at different laser output ports are identical. We describe the operation principle and experimentally demonstrate a three-port fiber sensor. For the IWDM technique, our proposed fiber grating sensor system can enhance the sensing capacity, signal-to-noise ratio, and sensing resolution.
Long-distance FBG sensor system using a linear-cavity fiber Raman laser scheme
(2004-02-01)
Peng, PC
;
Tseng, HY
;
Chi, S
;
光電工程學系
;
Department of Photonics
We propose a novel fiber Bragg grating (FBG) sensor system using a linear-cavity fiber laser scheme with a distributed Raman amplifier as a gain medium. The inhomogeneous broadening property of the distributed Raman amplifier is used for multiwavelength operation. The experiment shows that such a linear-cavity fiber Raman laser can provide a stable output with an optical signal-to-noise ratio over 50 dB even if the FBG is located at a 25-km remote sensing position. The feature of our proposed fiber laser can facilitate a long-distance or a large-scale fiber sensor system and can be easily extended for multipoint sensing applications.
Long-distance FBG sensor system using fiber ring laser with hybrid amplifier
(2005)
Peng, PC
;
Feng, KM
;
Peng, WR
;
Chiou, HY
;
Chang, CC
A fiber Bragg grating (FBG) sensor system using a fiber ring laser with a hybrid amplifier is proposed and demonstrated. The hybrid amplifier comprises an erbium doped waveguide amplifier and a semiconductor optical amplifier. The experiment shows that such the hybrid amplifier has a high amplifier spontaneous emission power and gain spectrum. Moreover, this fiber ring laser can provide a stable multiwavelength output with an optical signal-to-noise ratio over 50 dB even if the FBGs are located at a 25 kin remote sensing position.
Long-distance fiber grating sensor system using a fiber ring laser with EDWA and SOA
(2005-08-01)
Peng, PC
;
Feng, KM
;
Peng, WR
;
Chiou, HY
;
Chang, CC
This investigation presents and demonstrates the feasibility of a novel fiber Bragg grating (FBG) sensor system using a fiber ring laser with a hybrid amplifier. The hybrid amplifier comprises an erbium-doped waveguide amplifier (EDWA) and a semiconductor optical amplifier (SOA). Experimental results demonstrate that the hybrid amplifier has a higher amplifier spontaneous emission power and gain spectrum. Moreover, this novel fiber ring laser provides a stable multiwavelength output with an optical signal-to-noise ratio over 50 dB, even when FBGs are located at a 25 km remote sensing position. The primary feature of the proposed fiber laser is that it facilitates a long-distance or a large-scale sensor system. (C) 2005 Elsevier B.V. All rights reserved.
Multiwavelength fiber laser using S-band erbium-doped fiber amplifier and semiconductor optical amplifier
(2006-03-01)
Peng, PC
;
Feng, KM
;
Chang, CC
;
Chiou, HY
;
Chen, JH
A multiwavelength fiber ring laser that is based on an S-band erbium-doped fiber amplifier (EDFA) and a semiconductor optical amplifier (SOA) is developed. An optical switch is used to switch the multiwavelength fiber laser between S-band and L-band. This fiber laser can stably lase seven wavelengths in the S-band or 28 wavelengths in the L-band. Additionally, the lasing wavelengths with a signal-to-noise ratio of over 33 dB and a wavelength spacing of 100 GHz are demonstrated experimentally. The average powers of the lasing wavelength in the S-band and the L-band are -7.53 and -12.15 dBm, respectively. (c) 2005 Elsevier B.V. All rights reserved.
OCDMA light source using directly modulated Fabry-Perot laser diode in an external injection scheme
(2006-05-01)
Peng, PC
;
Peng, WR
;
Feng, KM
;
Chiou, HY
;
Chen, J
This investigation proposes and experimentally demonstrates an optical code-division multiple-access (OCDMA) light source using a directly modulated Fabry-Perot laser diode in an external injection scheme. This light source has an optical sidemode suppression ratio of over 27.5 dB and a pulsewidth of around 55 ps. Such a narrow pulsewidth has great potential for a two-dimensional OCDMA system. Additionally, the bit-error-rate performance with a 2(31) - 1 pseudorandom bit sequence indicates the feasibility of this light source in a 2.488-Gb/s system application.
Over 31 nm wavelength-switched pulse generation from a fiber ring laser with a Fabry-Perot laser diode
(2004-07-01)
Peng, PC
;
Chi, S
;
光電工程學系
;
Department of Photonics
An actively mode-locked fiber ring laser for generating wavelength-switched optical pulses is demonstrated in this paper. A Fabry-Perot laser diode (FP-LD) is used as a modulator, and a tunable filter is used as a wavelength selector. At a fixed modulation frequency, the optical side-mode-suppression-ratio (SMSR) of this fiber laser is better than 40dB over the wavelength-switched range of 31 nm. The pulsewidth is between 41.72 ps and 44.74 ps.
Performance comparisons between direct NRZ and gain-switched RZ modulation on Fabry-Perot lasers
(2005)
Peng, WR
;
Peng, PC
;
Chen, J
;
Tsai, SY
;
Chi, S
We firstly study the performance comparisons between direct non-return to zero and gain-switched return to zero data formats on a Fabry-Perot laser. With high speed electrical AND gate, we also investigate the relation between the pulse width of electrical drive signal and the quality of optical eye diagrams. It is found that shorter pulse width of electrical signal can completely eliminate the pattern effect and the sensitivity of RZ format is 3.8-dB better than NRZ format at data rate = 2.488-Gbps.