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Asia communications and Photonics Conference and Exhibition (ACP)

作者： N. Md Samsuri A. K. Zamzuri M. A. Mahdi Photonics Transmission Cluster Telekom Research and Development Sdn. Bhd. Serdang Selangor Darul Ehsan Malaysia Photonics and Fiber Optic System Laboratory Department of Computer and Communications Systems Engineering Universiti Putra Malaysia Malaysia

Brillouin/Erbium fiber laser using a ring laser configuration with a pre-amplified Brillouin pump is demonstrated. This configuration generated 7 Brillouin Stokes with 0.086 nm spacing and the first-Stokes peak power ... 详细信息

关键词： Erbium Erbium-doped fiber lasers Pump lasers Ring lasers Laser excitation Brillouin scattering Optical fiber sensors Laser tuning Optical ring resonators Optical fiber communication

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A multiplication-accumulation computation unit with optimized compressors and minimized switching activities

A multiplication-accumulation computation unit with optimize...

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IEEE International Symposium on Circuits and systems 2005, ISCAS 2005

作者： Chen, Li-Hsun Chen, Oscal T.-C. Wang, Teng-Yi Ma, Yung-Cheng Signal and Media Laboratories Department of Electrical Engineering National Chung Cheng University Chia-Yi 621 Taiwan Computer System Development Dept. Computer and Communications Research Labs. Industrial Technology Research Institute Hsinchu 310 Taiwan

ISBN: (纸本)9780780388345

A low-power Multiplication-Accumulation Computation (MAC) unit using the radix-4 Booth algorithm is proposed in this work, by reducing its architectural complexity and minimizing the switching activities. However, to maintain a high performance, the critical delays and hardware complexities of MAC units are explored to derive at a MAC unit with a high performance and a low hardware complexity. In addition, a carry-save addition operation with optimized compressors is proposed to omit the use of half adders to further reduce the hardware complexity. Furthermore, the scheme to reduce the switching activity is proposed in this work to lower the power consumption of the proposed MAC unit. In performing a MAC for XY+Z, the effective dynamic ranges of X and Y are detected, the one with the smaller effective dynamic range is processed for Booth decoding so as to increase the probability of the partial products being zero, and thus the switching activity of the MAC unit is reduced. Moreover, the effective dynamic range of the result from this multiplication is also estimated and compared with the effective dynamic range of the datum, Z. The larger effective dynamic range of the two data is considered as the effective word length for an addition operation. Pipelined latches are used to make the non-effective operation maintaining the status of the previous operation so to reduce the switching activities from the addition performed in MAC. After the addition operation, sign extension is performed on the result from the effective sign bit copied to non-effective bits to derive at a correct output datum. When comparing to the conventional MAC units, the proposed MAC unit is able to reduce 21.09% to 43.74% of power consumption. Additionally, the proposed MAC unit outperforms the conventional ones in comparing the product of critical delay, area, and power consumption. © 2005 IEEE.

关键词： Electric power utilization

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Hybrid S- to L-band fiber amplifier module with coupled structure

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Optical Engineering 2005年第5期44卷 1-4页

作者： Yeh, Chien-Hung Chi, Sien Industrial Technology Research Institute Computer and Communications Research Laboratories Transmission System Department Chutung Hsinchu 310 Taiwan National Chiao Tung University Department of Photonics Institute of Electro-Optical Engineering Hsinchu 300 Taiwan Yuan Ze University Department of Electrical Engineering Chung-Li 320 Taiwan

A new S- to L-band EDFA module with coupled structure that reaches a 120-nm gain bandwidth of 1480 to 1600 nm is experimentally investigated. Peak gains of 32.7, 34.5, and 32.9 dB are obtained at 1504, 1534, and 1570 nm with -30 dBm input signal power, respectively. Furthermore, the amplifier provides a broadband ASE light source of 1480 to 1606 nm as the output levels are above -40 dBm.

关键词： Fiber lasers

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A tunable erbium-doped waveguid amplifier-based ring laser with single-frequency operation

A tunable erbium-doped waveguid amplifier-based ring laser w...

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Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim 2005

作者： Yeh, Chien-Hung Fan, Kuo-Pao Chi, Sien Transmission System Dept. Computer and Communications Research Laboratories Industrial Technology Research Institute Chutung Hsinchu 310 Taiwan Department of Electrical Engineering Yuan Ze University Chung-Li 320 Taiwan

A fiber ring laser with the wavelength tunability and single-longitudinal- mode oscillation based on a C-band erbium-doped waveguide amplifier is proposed and demonstrated. A saturable-absorber-based autotracking filt... 详细信息

ISBN: (纸本)0780392426

关键词： Ring lasers

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A multiplication-accumulation computation unit with optimized compressors and minimized switching activities

A multiplication-accumulation computation unit with optimize...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： Li-Hsun Chen O.T.-C. Chen Teng-Yi Wang Yung-Cheng Ma Signal and Media Laboratories Department of Electrical Engineering National Chung Cheng University Chiayi Taiwan Computer System Development Department Computer & Communications Research Laboratories Industrial Technology and Research Institute Hsinchu Taiwan

A low-power multiplication-accumulation computation (MAC) unit using the radix-4 Booth algorithm is proposed; its architectural complexity is reduced and switching activities are minimized. However, to maintain a high performance, the critical delays and hardware complexities of MAC units are explored to derive a MAC unit with high performance and low hardware complexity. A carry-save addition operation with optimized compressors is proposed to omit the use of half adders to reduce the hardware complexity further. A scheme to reduce switching activity is also proposed to lower the power consumption of the MAC unit. In performing a MAC for X/spl times/Y+Z, the effective dynamic ranges of X and Y are detected; the one with the smaller effective dynamic range is processed for Booth decoding so as to increase the probability of the partial products being zero, and thus the switching activity is reduced. Also, the effective dynamic range of the result from this multiplication is estimated and compared with the effective dynamic range of the datum, Z. The larger effective dynamic range of the two data is considered as the effective word length for an addition operation. Pipelined latches are used to make the noneffective operation maintain the status of the previous operation so as to reduce the switching activities from the addition performed in MAC. After the addition operation, sign extension is performed on the result from the effective sign bit copied to non-effective bits to derive at a correct output datum. Compared to conventional MAC units, the proposed one is able to reduce 21.09% to 43.74% of power consumption. Additionally, the proposed MAC unit outperforms conventional ones in comparing the product of critical delay, area, and power consumption.

关键词： Compressors Energy consumption Hardware computer architecture Delay Dynamic range Switching circuits Communication switching Digital signal processing Switched capacitor circuits

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An experiment on performance study of IEEE 802.15.4 wireless networks

An experiment on performance study of IEEE 802.15.4 wireless...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Jin-Shyan Lee Department of Internet Embedded System (X100) Computer & Communications Research Laboratories Industrial Technology and Research Institute Hsinchu Taiwan

IEEE 802.15.4 is an emerging standard specifically designed for low-rate wireless personal area networks (LR-WPAN) with a focus on enabling the wireless sensor networks. It attempts to provide a low data rate, low power, and low cost wireless networking on the device-level communication. In this paper, we have established a realistic environment for the preliminary performance evaluation of the IEEE 802.15.4 wireless networks. Several sets of practical experiments are conducted to study its various features, including the effects of I) the direct and indirect data transmissions, 2) CSMA-CA mechanism, 3) data payload size, and 4) beacon-enabled mode. The data throughput, delivery ratio, and received signal strength indication (RSSI) are investigated as the performance metrics

关键词： Wireless networks Wireless sensor networks Wireless personal area networks Costs Throughput Medical simulation IP networks Data communication Payloads Communication cables

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A Tunable Erbium-Doped Waveguid Amplifier-Based Ring Laser with Single-Frequency Operation

A Tunable Erbium-Doped Waveguid Amplifier-Based Ring Laser w...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Chien-Hung Yeh Kuo-Pao Fan Sien Chi Transmission System Department Computer & Communications Research Laboratories Industrial Technology and Research Institute Hsinchu Taiwan Department of Electrical Engineering Yuan-Ze University Chungli Taiwan

A fiber ring laser with the wavelength tunability and single-longitudinal-mode oscillation based on a C-band erbium-doped waveguide amplifier is proposed and demonstrated. A saturable-absorber-based autotracking filte... 详细信息

A fiber ring laser with the wavelength tunability and single-longitudinal-mode oscillation based on a C-band erbium-doped waveguide amplifier is proposed and demonstrated. A saturable-absorber-based autotracking filter is utilized to guarantee the single-frequency operation.

关键词： Tunable circuits and devices Erbium-doped fiber amplifier Operational amplifiers Ring lasers Erbium-doped fiber lasers Laser tuning Optical filters Optical fiber filters Optical pumping Optical ring resonators

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Erratum: 'Operation of Saturable-Absorber-Based Autotracking Filter for a Stabilized Single-Frequency Erbium Fiber Laser'

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Japanese Journal of Applied Physics 2005年第12R期44卷

作者： Chien-Hung Yeh Kuo-Pao Fan Sien Chi Transmission System Department Computer and Communications Research Laboratories Industrial Technology Research Institute Chutung Hsinchu 310 Taiwan Department of Electrical Engineering Yuan Ze University Chung-Li 320 Taiwan

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A Tunable and Stabilized Single-Frequency Fiber Ring Laser Based on Hybrid Amplifier and Shorter Length EDF with Umpumped Status

A Tunable and Stabilized Single-Frequency Fiber Ring Laser B...

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20th Congress of the International Commission for Optics

作者： Chien-Hung Yeh Sien Chi Transmission System Dept. Computer & Communications Research Laboratories Industrial Technology Research Institute Rm. 143 Bldg. 14 195 Sec. 4 Chung Hsing Rd. Chutung Hsinchu 310 Taiwan R.O.C Department of Photonics & Institute of Electro-Optical Engineering National Chiao Tung University Hsinchu 310 Taiwan R.O.C. Department of Electrical Engineering Yuan Ze University Chung-Li 320 Taiwan R.O.C.

A novel fiber ring laser technique, which covers both C- and L-bands, with the function of wavelength tunability and single-longitudinal-mode oscillation, is proposed and demonstrated experimentally.

关键词： single-frequency, EDFA, SOA, fiber ring laser, L-band

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Erratum: 'A Wavelength-Tunable Erbium-Doped Fiber Double-Ring Laser with Stabilized Single-Frequency Operation'

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Japanese Journal of Applied Physics 2005年第12R期44卷

作者： Chien-Hung Yeh Sien Chi Transmission System Dept. Computer & Communications Research Laboratories Industrial Technology Research Institute Chutung Hsinchu 310 Taiwan Department of Electrical Engineering Yuan Ze University Chungli 320 Taiwan

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