Browsing by Author "Wang, BH"

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Demonstration of gigabit WDMA networks using parallelly processed subcarrier hopping pilot-tone (P-3) signaling technique
(1996-07-01)
Wang, BH
;
Yen, KY
;
Way, WI
;
電信工程研究所
;
電信研究中心
An extremely short header transmission and processing time in a gigabit wavelength-division-multiple-access (WDMA) network has been experimentally demonstrated. This was achieved by using parallelly processed subcarrier hopping pilot-tones in combination with an array of detectors and RF switches. The results showed that, without considering the time consumed in an arbitration circuit, the total processing time of the hopping pilot-tone headers was as short as 40 ns which is independent of the number of network nodes and data transmission rate.
Demonstration of gigabit WDMA networks using parallelly processed subcarrier hopping pilot-tone (P-3) signaling technique
(1996-07-01)
Wang, BH
;
Yen, KY
;
Way, WI
;
電信工程研究所
;
電信研究中心
An extremely short header transmission and processing time in a gigabit wavelength-division-multiple-access (WDMA) network has been experimentally demonstrated. This was achieved by using parallelly processed subcarrier hopping pilot-tones in combination with an array of detectors and RF switches. The results showed that, without considering the time consumed in an arbitration circuit, the total processing time of the hopping pilot-tone headers was as short as 40 ns which is independent of the number of network nodes and data transmission rate.
Large-signal spurious-free dynamic range due to static and dynamic clipping in direct and external modulation systems
(1998-10-01)
Wang, BH
;
Chiang, PY
;
Kao, MS
;
Way, WI
;
電信工程研究所
Large-signal spurious-free dynamic range (SFDR) is useful in an optical system with a high intensity noise level, which can be due to optical reflections or optical beat interference, and with large modulating signals to achieve sufficient carrier-to-noise ratio (CNR). A closed-form analysis on large-signal SFDR due to static and dynamic clipping for direct and external modulation systems is presented in this paper. The analysis can be applied to laser diodes (LD's) and external modulators with arbitrary transfer functions. We have used the analysis to predict the theoretical upper-bound for large-signal SFDR due to static clipping in an ideal LD add external modulators with various linearization techniques. We have also used the analysis to predict the dynamic-clipping-induced nonlinear distortions (NLD's) id. a weakly clipped LD, and confirm that dynamic clipping is more important to consider than static clipping when weak LD clipping takes place. Large-signal SFDR's in practical LD's and external modulators were also compared. The validity of our analysis is confirmed through computer simulation and actual measurement of clipping-induced NLD's in a typical CATV-quality DFB LD.
Multiple access in the presence of optical-beat and co-channel interference using Walsh-code-based synchronized CDMA technique
(1997-08-01)
Hsiao, CC
;
Wang, BH
;
Way, WI
;
電信工程研究所
;
Institute of Communications Engineering
We experimentally demonstrated the feasibility of using Walsh-code-hased synchronized code-division-multiple access (S-CDMA) technique to achieve multiple access in the presence of optical-beat interference (OBI), This multiple access technique can, thus, be applied to WDMA networks using subcarrier-based common wavelength signaling, or PON's which generally do not have wavelength control on uplink laser diodes.
Multiple access in the presence of optical-beat and co-channel interference using Walsh-code-based synchronized CDMA technique
(1997-08-01)
Hsiao, CC
;
Wang, BH
;
Way, WI
;
交大名義發表
;
電信工程研究所
We experimentally demonstrated the feasibility of using Walsh-code-hased synchronized code-division-multiple access (S-CDMA) technique to achieve multiple access in the presence of optical-beat interference (OBI), This multiple access technique can, thus, be applied to WDMA networks using subcarrier-based common wavelength signaling, or PON's which generally do not have wavelength control on uplink laser diodes.
Suppression of optical beat interference using synchronised CDMA technique and in-band clipping carrier
(1997-10-23)
Wang, BH
;
Hsiao, CC
;
Way, WI
;
電信工程研究所
;
Institute of Communications Engineering
The authors propose adding a coherent in-band clipping carrier to a previously demonstrated Walsh-code-based synchronised CDMA (S-CDMA) technique to further suppress the optical beat interference (OBI). Experimental results showed thar a negligible system power penalty can be achieved even when the OBI-induced intensity noise was as high as -90.9dB/Hz. In addition, a large system dynamic range of 10dB can tx obtained to relax the tight power control requirement on S-CDMA signals.