Browsing by Author "Shih, Po Tsung"

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A novel direct detection microwave photonic vector modulation scheme for radio-over-fiber system
(2008-07-01)
Lin, Chun-Ting
;
Dai, Sheng-Peng
;
Chen, Jason (Jyehong)
;
Shih, Po Tsung
;
Peng, Peng-Chun
This letter demonstrates the feasibility of a novel direct detection microwave photonic vector modulation scheme for the radio-over-fiber (RoF) system. Unlike the traditional double-sideband with optical carrier suppression modulation scheme, which can carry only the on-off keying data format, the proposed scheme encodes the electrical vector signal on either the upper sideband (USB) or the lower sideband (LSB) only and a pure optical subcarrier on the other sideband. Therefore, phase and amplitude information will be preserved after direct detection. A frequency doubling scheme is employed to reduce the cost of RoF systems. Additionally, the relative intensity between USB and LSB can be easily tuned by adjusting the individual power of electrical driving signals to optimize the performance of the optical radio-frequency signals. A proof-of-concept experiment is conducted by using a 1.25 Gb/s BPSK signal at a carrier frequency of 20 GHz. After transmission over 50-km single-mode fiber, the receiver sensitivity penalty is less than 0.5 dB.
A W-Band Photonic Transmitter-Mixer Based on High-Power Near-Ballistic Uni-Traveling-Carrier Photodiode (NBUTC-PD) for 1.25-Gb/s BPSK Data Transmission under Bias Modulation
(2009)
Wu, Y. -S.
;
Kuo, F. -M.
;
Wang, Shao-Ning
;
Chen, Nan-Wei
;
Shi, J. -W
We demonstrate W-band photonic transmitters-mixers, which are composed of near-ballistic-uni-traveling-carrier-photodiodes and quasi-Yagi antennas without integrating Si-lens. By utilizing it, data-transmission at W-band can be achieved under bias modulation of 1.25-Gb/s BPSK with 5GHz IF signals. (C) 2009 Optical Society of America
Adjustable optical signal delay module and method thereof
(2010-03-25)
Chen, Jye Hong
;
Kao, Wei-Che
;
Peng, Peng-Chun
;
Lin, Chun-Ting
;
Wu, Fang Ming
The present invention relates to an adjustable optical signal delay module, particularly to a module, which adjusts power of an amplified spontaneous emission generated by a semiconductor optical amplifier and reversely feeds the adjusted amplified spontaneous emission back to the semiconductor optical amplifier to vary a group refractive index of the semiconductor optical amplifier and delay the timing of an optical signal, whereby the present invention can replace the pump laser conventionally required by a CPO mechanism. In the present invention, the feedback optical loop comprises a variable optical attenuator, an optical filter, and optical circulators. An user can control the delay timing of optical signals via adjusting optical power in the feedback optical loop. The present invention can decrease the fabrication cost of an optical signal delay module and reduce the volume thereof.
Cost-effective multiservice's hybrid access networks with no optical filter at remote nodes
(2008-05-01)
Lin, Chun-Ting
;
Shih, Po Tsung
;
Chen, Jason (Jyehong)
;
Peng, Peng-Chun
;
Dai, Sheng-Peng
This letter experimentally demonstrates a multi-services hybrid access network integrated radio-over-fiber and fiber-to-the-home systems which share the same distributed architecture. A 1.25-Gb/s baseband signal and a 14.375-GHz radio-frequency (RF) signal with 625-Mb/s binary phase-shift keying data are generated and transmitted employing a commercially available dual-electrode Mach-Zehuder modulator. The proposed scheme offers better performance, has no RF fading issue, can carry vector signals, and requires no optical filter at remote nodes. After transmission over 25-km single-mode fiber, the proposed scheme successfully achieves less than 0.5-dB sensitivity penalties.
Experimental Demonstration of Optical 5-Gb/s 16-QAM OFDM Signal Generation and Wavelength Reuse for 1.25-Gbit/s Uplink Signal
(2008)
Lin, Chun-Ting
;
Jiang, Wen-Jr
;
Chen, Jason (Jyehong)
;
Wong, Er-Zih
;
Dai, Sheng-Peng
5Gb/s 16QAM OFDM signal for ROF downstream link and 1.25Gb/s OOK signal via RSOA for upstream link are demonstrated. Negligible penalty is observed after 25km SMF.
Experimental Demonstration of Optical Colorless Direct-Detection OFDM Signals with 16-and 64-QAM Formats beyond 15 Gb/s
(2008)
Lin, Chun-Ting
;
Dai, Sheng-Peng
;
Jiang, Wen-Jr
;
Chen, Jason (Jyehong)
;
Lin, Yu-Min
Both highly spectral-efficient direct-detection 15-Gb/s 64-QAM and 20-Gb/s 16-QAM OFDM signals are demonstrated. Negligible penalty is observed following 25-km SMF transmission.
Fast light improvement using periodic bending of erbium-doped fiber
(2008-01-01)
Peng, Peng-Chun
;
Kao, Wei-Che
;
Lin, Chun-Ting
;
Chen, Jason (Jyehong)
;
Shih, Po Tsung
This investigation for the first time, experimentally demonstrates the fast light improvement in an erbium-doped fiber. The time advance is increased over 140 % by the periodic bending of erbium-doped fiber. (C) 2008 Optical Society of America.
Generation of carrier suppressed optical mm-wave signals using frequency quadrupling and no optical filtering
(2008)
Lin, Chun-Ting
;
Shih, Po Tsung
;
Chen, Jason (Jyehong)
;
Peng, Peng-Chun
;
Dai, Sheng-Peng
This work demonstrates a novel mm-wave generation using a frequency quadrupling technique. Only one external MZM is used and no optical filter is needed. It provides a simple and inexpensive choice for WDM RoF applications. (C)2008 Optical Society of America.
Generation of direct-detection optical OFDM signal for radio-over-fiber link using frequency doubling scheme with carrier suppression
(2008)
Lin, Chun-Ting
;
Lin, Yu-Min
;
Chen, Jason (Jyehong)
;
Dai, Sheng-Peng
;
Peng, Peng-Chun
This investigation demonstrates the generation of OFDM-RoF signal using frequency doubling. Benchmarked against the OOK format, the 4-Gb/s, 16-QAM OFDM format has four times the higher spectral efficiency with a sensitivity penalty of under 2.6-dB. (c) 2007 Optical Society of America.
Generation of optical millimeter-wave signals and vector formats using an integrated optical I/Q modulator [Invited]
(2009-02-01)
Chen, Jyehong
;
Lin, Chun-Ting
;
Shih, Po Tsung
;
Jiang, Wen-Jr
;
Dai, Sheng-Peng
This study discusses two key technologies used in radio-over-fiber (RoF) systems, namely, the generation and transmission of millimeter-wave signals and optical modulation schemes capable of carrying vector signal formats and utilizing the continuous performance improvements offered by digital signal processing. A cost-effective frequency-quadrupling technique capable of generating millimeter-wave signals up to 72 GHz is proposed. The generated optical millimeter-wave signals have very high quality, with an optical carrier and harmonic distortion suppression ratio exceeding 36 dB. An optical modulation scheme that can support a 64-QAM, 16 Gbits/s orthogonal frequency-division multiplexing RoF system is also demonstrated. Results of this study demonstrate that both methods offer realistic solutions to support future wireless systems. (C) 2009 Optical Society of America
MODULATION DEVICE FOR GENERATING OPTICAL SIGNAL WITH QUADRUPLE FREQUENCY AND METHOD THEREOF
(2009-08-27)
CHEN, Jye Hong
;
Lin, Chung-Ting
;
Shih, Po Tsung
;
Peng, Peng-Chun
;
Dai, Sheng Peng
The present invention discloses a modulation device for generating an optical signal with quadruple frequency and the modulation method thereof. The modulation device in the present invention utilizes a commercial integrated modulator, a RF signal generator and a phase shifter to generate an optical signal with quadruple frequency. When the RF signal generator generates a first modulation signal, and the phase shifter shifts the first modulation signal by 90 degrees to generate a second modulation signal, the integrated modulator is biased to transmit the optical signal in maximum value and to modulate the first and second modulation signal so as to generate a output optical signal with quadruple frequency.
OPTICAL AMPLIFIER FOR TUNING TRANSMISSION TIME OF OPTICAL SIGNAL
(2009-09-17)
CHEN, Jyehong
;
Kao, Wei-Che
;
Peng, Peng-Chun
;
Lin, Chun-Ting
;
Shih, Po Tsung
The present invention relates to a technique for tuning the transmission time of optical signal, which adopts an optical amplifier with a bending structure for enhancing the tunable time of optical signal. The effect of tunable time of optical signal can be achieved by adjusting the gain of the optical amplifier.
Optical direct-detection OFDM signal generation for radio-over-fiber link using frequency doubling scheme with carrier suppression
(2008-04-28)
Lin, Chun-Ting
;
Lin, Yu-Min
;
Chen, Jason (Jyehong)
;
Dai, Sheng-Peng
;
Shih, Po Tsung
This investigation demonstrates the generation of OFDM-RoF signal using frequency doubling technique for the first time, to the author's best knowledge. The 4-Gb/s OFDM signal using 16-QAM format modulated on each subcarrier at a center frequency of 19GHz is experimentally demonstrated. Benchmarked against the OOK format, the 16-QAM OFDM format has the higher spectral efficiency with a sensitivity penalty of less than 2.6 dB. After transmission over 50-km single mode fiber, the power penalties of RF OOK and OFDM signals are less than 0.5dB. (c) 2008 Optical Society of America.
Optical modulation device
(2010-04-29)
Chen, Jye Hong
;
Lin, Chun-Ting
;
Jiang, Wen-Jr
;
Peng, Peng-Chun
;
Shih, Po Tsung
The present invention discloses an optical modulation device, which comprises an electric signal generator generating an electric signal carrying a data signal; a first sinusoidal signal generator generating a first sinusoidal signal; an optical signal generator generating an input source optical signal; and an optoelectronic modulator(Mach-Zehnder modulator) receiving the input source optical signal, the electric signal and the first sinusoidal signal, biased to modify a transmission performance of the input source optical signal, modulating the input source optical signal with the electric signal and the first sinusoidal signal, and then sending out an output source optical signal carrying the electric signal and the first sinusoidal signal. The present invention realizes frequency multiplication, enables an optical signal to carry vector signals, and promotes the efficiency of broadband systems.
RF phase shifter using a distributed feedback laser in microwave transport systems
(2009-04-27)
Peng, Peng-Chun
;
Wu, Fang-Ming
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Jiang, Wen-Jr
;
Lan, Ruei-Long
;
Lin, Chun-Ting
This work experimentally demonstrates the efficacy of a radio-frequency phase shifter using a distributed feedback laser in a microwave transport system. Phase shifts of about 101 are obtained at 8.75GHz. The proposed phase shifter can amplify microwave signals and thereby improve transmission performance. Additionally, a similar single sideband modulation can be generated by the phase shifter. Experimental results indicate that the proposed phase shifter can be used in future long-distance microwave transport systems and all optical inverters. (C) 2009 Optical Society of America
Transmission improvement in fiber radio links using semiconductor laser
(2008-01-01)
Peng, Peng-Chun
;
Lin, Chun-Ting
;
Jiang, Wen-, Jr.
;
Chen, Jason (Yehong)
;
Shih, Po Tsung
This investigation experimentally demonstrates the performance improvement in fiber-radio links by using a semiconductor laser. This technique improves receiver sensitivity over 4.5 dB by increasing the optical modulation depth. (C)2008 Optical Society of America.
Tunable Photonic Microwave Filter using Slow Light in Vertical Cavity Surface Emitting Laser
(2009-01-01)
Peng, Peng-Chun
;
Yeh, Shin-Kai
;
Wu, Fang-Ming
;
Chen, Jason (Jyehong)
;
Lin, Chun-Ting
A tunable photonic microwave filter using slow light in a VCSEL is proposed and experimentally demonstrated for the first time. Tunable microwave notch filter at 20 GHz can be achieved by adjusting the bias current of VCSEL. (C) 2009 Optical Society of America
Tunable Slow Light in Semiconductor Optical Amplifier without External Pump Laser
(2008-01-01)
Peng, Peng-Chun
;
Kao, Wei-Che
;
Chen, Jason (Jyehong)
;
Wu, Fang-Ming
;
Lin, Chun-Ting
This investigation experimentally demonstrates tunable slow light in a semiconductor optical amplifier (SOA) without an external pump laser. Tunable time delays are achieved by adjusting the feedback signal from the SOA.