The Experts below are selected from a list of 81 Experts worldwide ranked by ideXlab platform
Chun-kit Chan - One of the best experts on this subject based on the ideXlab platform.
-
Maximum Likelihood Sequence Estimation in the Presence of Timing Misalignment and Polarization Mode Dispersion in Optically Amplified Return-to- Zero Systems
2016Co-Authors: Jian Zhao, Lian-kuan Chen, Chun-kit ChanAbstract:Abstract—We investigate the performance of maximum likelihood sequence estimation (MLSE) receiver in the presence of the impairments from both the pulse carver-Data Modulator timing misalignment (TM) and polarization mode dispersion (PMD) in optically amplified return-to-zero (RZ) systems. RZ modulation format is commonly used in long-haul wavelength-division multiplexing transmission systems and the dominating noise source in those systems is amplified spontaneous emission (ASE) noise, which is signal dependent and requires special study when direct detection is employed. In this paper, based on the bit-to-bit error probability estimation using Karhunen-Loeve (KL) expansion and decorrelation of noise components, we use the steepest descent method to obtain sequence-to-sequence error probability and achieve the performance evaluation of MLSE receiver with arbitrary input signal pulse shape, optical filtering and electrical filtering taken into consideration. Monte Carlo simulations of a 10-Gb/s RZ system are demonstrated and agree with the theory well. The results show that the power penalty induced by TM and PMD can be effectively reduced by MLSE receiver, which thus validates its capability to enhance tolerance to both TM and PMD with shared electrical devices. Keywords- Equalizers, optical fiber communication, modulation I
-
high speed Data and pulse carver alignment in rz ook systems using delay tap asynchronous waveform sampling
European Conference on Optical Communication, 2006Co-Authors: Yuenching Ku, Chun-kit ChanAbstract:A novel technique for monitoring the alignment status between pulse carver and Data Modulator in RZOOK systems is proposed and experimentally demonstrated. Both the magnitude and direction of such timing misalignment can be successfully determined.
-
A novel technique for pulse-carver and Data alignment monitoring in RZ-DPSK systems using off-center optical filtering
IEEE Photonics Technology Letters, 2005Co-Authors: Lian-kuan Chen, Chun-kit ChanAbstract:A novel technique for monitoring the timing alignment between the pulse carver and the Data Modulator in return-to-zero differential phase-shift keying systems is proposed and experimentally demonstrated. A simple off-center optical filter is employed to extract optical power for alignment monitoring. Compared with the previous degree of polarization-based monitoring scheme, in which the monitoring power dynamic range (MPDR) is /spl sim/0.2 dB, a larger MPDR of 3.35 dB is achieved within the same timing alignment range of half-bit period, thus achieving a higher monitoring sensitivity. In addition, this simple alignment monitoring scheme features high-speed operation, polarization independence, and easy integration with transmitter for synchronization feedback control.
-
Performance Degradation Induced byPulse Carver/Data
2005Co-Authors: Lian-kuan Chen, Chun-kit ChanAbstract:Theimpacts ofthedistortion induced bypulse carver/Data Modulator misalignment on theperformance ofRZ-DPSKsystems areinvestigated. Suchdistortion canbegeneralized as intersymbol interference andstrongly depends oninput Data pulse shape. ©2005Optical Society ofAmerica OCIScodes: (060.2330) Fiber optics communications; (060.2380) Fiber optics sources anddetectors
-
A novel technique for modulation alignment monitoring in RZ-DPSK systems using off-center optical filtering
OFC NFOEC Technical Digest. Optical Fiber Communication Conference 2005., 2005Co-Authors: Chun-kit Chan, Lian-kuan ChenAbstract:A novel high-speed polarization-independent off-center optical filtering technique for monitoring alignment status between pulse generator and Data Modulator in RZ-DPSK systems is proposed and demonstrated. A monitoring dynamic range of 3.35 dB is achieved experimentally.
Lian-kuan Chen - One of the best experts on this subject based on the ideXlab platform.
-
Maximum Likelihood Sequence Estimation in the Presence of Timing Misalignment and Polarization Mode Dispersion in Optically Amplified Return-to- Zero Systems
2016Co-Authors: Jian Zhao, Lian-kuan Chen, Chun-kit ChanAbstract:Abstract—We investigate the performance of maximum likelihood sequence estimation (MLSE) receiver in the presence of the impairments from both the pulse carver-Data Modulator timing misalignment (TM) and polarization mode dispersion (PMD) in optically amplified return-to-zero (RZ) systems. RZ modulation format is commonly used in long-haul wavelength-division multiplexing transmission systems and the dominating noise source in those systems is amplified spontaneous emission (ASE) noise, which is signal dependent and requires special study when direct detection is employed. In this paper, based on the bit-to-bit error probability estimation using Karhunen-Loeve (KL) expansion and decorrelation of noise components, we use the steepest descent method to obtain sequence-to-sequence error probability and achieve the performance evaluation of MLSE receiver with arbitrary input signal pulse shape, optical filtering and electrical filtering taken into consideration. Monte Carlo simulations of a 10-Gb/s RZ system are demonstrated and agree with the theory well. The results show that the power penalty induced by TM and PMD can be effectively reduced by MLSE receiver, which thus validates its capability to enhance tolerance to both TM and PMD with shared electrical devices. Keywords- Equalizers, optical fiber communication, modulation I
-
Alignment monitoring technique for pulse carver and Data Modulator in RZ-DPSK systems using an optical frequency discriminator
IEEE Photonics Technology Letters, 2006Co-Authors: Kuen Ting Tsai, Lian-kuan Chen, W.i. WayAbstract:A technique for monitoring the timing alignment between a pulse carver and a phase Modulator in return-to-zero differential phase-shift keying systems is proposed. An optical frequency discriminator and a microwave detector centered at a half of the phase modulation Data rate are used to monitor the spectrum broadening caused by timing misalignment. The proposed method has a large detection dynamic range and is polarization-independent
-
A novel technique for pulse-carver and Data alignment monitoring in RZ-DPSK systems using off-center optical filtering
IEEE Photonics Technology Letters, 2005Co-Authors: Lian-kuan Chen, Chun-kit ChanAbstract:A novel technique for monitoring the timing alignment between the pulse carver and the Data Modulator in return-to-zero differential phase-shift keying systems is proposed and experimentally demonstrated. A simple off-center optical filter is employed to extract optical power for alignment monitoring. Compared with the previous degree of polarization-based monitoring scheme, in which the monitoring power dynamic range (MPDR) is /spl sim/0.2 dB, a larger MPDR of 3.35 dB is achieved within the same timing alignment range of half-bit period, thus achieving a higher monitoring sensitivity. In addition, this simple alignment monitoring scheme features high-speed operation, polarization independence, and easy integration with transmitter for synchronization feedback control.
-
Performance Degradation Induced byPulse Carver/Data
2005Co-Authors: Lian-kuan Chen, Chun-kit ChanAbstract:Theimpacts ofthedistortion induced bypulse carver/Data Modulator misalignment on theperformance ofRZ-DPSKsystems areinvestigated. Suchdistortion canbegeneralized as intersymbol interference andstrongly depends oninput Data pulse shape. ©2005Optical Society ofAmerica OCIScodes: (060.2330) Fiber optics communications; (060.2380) Fiber optics sources anddetectors
-
A novel technique for modulation alignment monitoring in RZ-DPSK systems using off-center optical filtering
OFC NFOEC Technical Digest. Optical Fiber Communication Conference 2005., 2005Co-Authors: Chun-kit Chan, Lian-kuan ChenAbstract:A novel high-speed polarization-independent off-center optical filtering technique for monitoring alignment status between pulse generator and Data Modulator in RZ-DPSK systems is proposed and demonstrated. A monitoring dynamic range of 3.35 dB is achieved experimentally.
Jeffrey H. Sinsky - One of the best experts on this subject based on the ideXlab platform.
-
High-speed Data and pulse-carver alignment in dual Mach-Zehnder Modulator optical transmitters using microwave signal processing
Journal of Lightwave Technology, 2003Co-Authors: Jeffrey H. SinskyAbstract:A novel approach is presented for aligning the pulse carver and Data Modulator in a dual Mach-Zehnder (MZ) Modulator optical transmitter. This technique relies solely on the photodiode detected microwave power spectrum of the transmitted optical signal. Experimental results are presented that illustrate the spectral property to be exploited and two proposed techniques for designing a low cost automated carver and Modulator alignment system. A mathematical explanation for the spectral phenomenon is presented and shown to agree quite well with measurement and simulation results.
-
A microwave spectral approach for aligning high speed Data and soliton pulse trains in dual Mach-Zehnder Modulator optical transmitters
Optical Fiber Communication Conference and Exhibit, 1Co-Authors: Jeffrey H. SinskyAbstract:It has been shown that pulse carver and Data Modulator misalignment can be determined solely from microwave spectral measurements made on the transmitter optical output signal. This approach does not require the introduction of dither tones or any aberrations to the desired optical signal. A possible technique for using this spectral information to detect and correct the misalignment problem has been demonstrated. This approach looks to have much promise as a commercial solution to this problem. Simulation results support the laboratory findings and indicate that even with normal system parameter variations, the proposed approach should work well.
A Grant - One of the best experts on this subject based on the ideXlab platform.
-
a novel method for synchronizing the pulse carver and electroabsorption Data Modulator for ultralong haul dwdm transmission
IEEE Photonics Technology Letters, 2002Co-Authors: I Kang, L F Mollenauer, B Greene, A GrantAbstract:The authors demonstrate a novel solution to detect and correct the temporal misalignment between the pulse carver and electroabsorption Modulator for ultralong-haul dense wavelength-division-multiplexing transmission. The correct timing is achieved by minimizing the chirp of the optical Data pulses. The technique is independent of the bit rate and channel spacing and can be implemented at low cost. The device can also be used as a wavelength locker. The use of electroabsorption Modulators for ultralong-haul transmission is validated with a 5000-km 10-Gb/s soliton system experiment.
-
a novel method for synchronizing the pulse carver and electroabsorption Data Modulator in rz optical transmitters
Optical Fiber Communication Conference, 2002Co-Authors: I Kang, L F Mollenauer, B Greene, A GrantAbstract:In conclusion, we demonstrated a device to detect and correct the timing misalignment between the pulse carver and electroabsorption Data Modulator in a RZ transmitter. The device can be used for all the channels on the ITU grid. It is straightforward to modify the design of the device to work for a different bit-rate. The implementation of the device can be done at low cost. The device can also be used as a wavelength locker. We demonstrated that the EAM is viable as a Data Modulator even for ULH transmission. With the facile synchronization scheme the EAM affords, it should be even more attractive as a transmitter for future transmission systems.
Jian Zhao - One of the best experts on this subject based on the ideXlab platform.
-
Maximum Likelihood Sequence Estimation in the Presence of Timing Misalignment and Polarization Mode Dispersion in Optically Amplified Return-to- Zero Systems
2016Co-Authors: Jian Zhao, Lian-kuan Chen, Chun-kit ChanAbstract:Abstract—We investigate the performance of maximum likelihood sequence estimation (MLSE) receiver in the presence of the impairments from both the pulse carver-Data Modulator timing misalignment (TM) and polarization mode dispersion (PMD) in optically amplified return-to-zero (RZ) systems. RZ modulation format is commonly used in long-haul wavelength-division multiplexing transmission systems and the dominating noise source in those systems is amplified spontaneous emission (ASE) noise, which is signal dependent and requires special study when direct detection is employed. In this paper, based on the bit-to-bit error probability estimation using Karhunen-Loeve (KL) expansion and decorrelation of noise components, we use the steepest descent method to obtain sequence-to-sequence error probability and achieve the performance evaluation of MLSE receiver with arbitrary input signal pulse shape, optical filtering and electrical filtering taken into consideration. Monte Carlo simulations of a 10-Gb/s RZ system are demonstrated and agree with the theory well. The results show that the power penalty induced by TM and PMD can be effectively reduced by MLSE receiver, which thus validates its capability to enhance tolerance to both TM and PMD with shared electrical devices. Keywords- Equalizers, optical fiber communication, modulation I
-
Mitigation of timing-misalignment-induced distortion using electronic equalizer in RZ/CSRZ systems
IEEE Photonics Technology Letters, 2005Co-Authors: Jian Zhao, Lian-kuan Chen, Chun-kit ChanAbstract:A novel method using cost-effective electronic equalizer is proposed to mitigate the impairment from timing misalignment (TM) between the pulse carver and Data Modulator in return-to-zero (RZ) and carrier-suppressed RZ systems. Simulations show that maximum likelihood sequence equalizer (MLSE) significantly reduces TM-induced power penalty and sampling phase sensitivity. Simultaneous mitigation of both TM-induced distortion and polarization-mode dispersion using a single MLSE is also demonstrated.
-
Performance degradation induced by pulse carver/Data Modulator misalignment in RZ-DPSK systems
2005 Quantum Electronics and Laser Science Conference, 1Co-Authors: Jian Zhao, Lian-kuan Chen, Chun-kit ChanAbstract:The impacts of the distortion induced by pulse carver/Data Modulator misalignment on the performance of RZ-DPSK systems are investigated. Such distortion can be generalized as intersymbol interference and strongly depends on input Data pulse shape.
