[1]红外动目标识别跟踪系统的dsp+fpga实现




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Fiber Amplifier


329

Author(s): Ahmad, A (Ahmad, A.); Mahdi, MA (Mahdi, M. A.); Ali, MIM (Ali, M. I. Md); Zamzuri, AK (Zamzuri, A. K.)

Title: Investigation of hybrid gain-clamped Raman-fiber-amplifier/EDFA utilizing pump reuse technique

Source: LASER PHYSICS LETTERS, 5 (3): 202-205 2008

Abstract:

We investigate the performance of hybrid gain-clamped Raman-fiber-amplifier (RFA)/Erbium-doped fiber amplifier (EDFA) with respect to the conventional gain-clamped Raman fiber amplifier. The hybrid gain-clamped amplifier is constructed in two configurations: RFA/EDFA and EDFA/RFA. The conventional gain-clamped RFA produces the lowest gain variation, the lowest noise figure and the highest critical power amongst three amplifier configurations. By cascading the REA and EDFA in series, the hybrid gain-clamped amplifiers suffer performance degradation due to the unique characteristics of RFA and EDFA. The noise figure degradation is strongly influenced by the performance of the first stage amplifier and the RFA/EDFA configuration produces the highest noise figure. On the other hand, the EDFA/RFA configuration experiences fastest saturation due to the pump depletion in the RFA.


Addresses: Univ Putra Malaysia, Fac Engn, Dept Comp & Commun Syst Engn, Photon Lab, Serdang 43400, Malaysia

Univ Putra Malaysia, Malaysian Technol Dev Corp, Lightwave Syst Unit, TM Res & Dev Sendirian Berhad, Serdang 43400, Malaysia

Reprint Address: MAHDI, MA, UNIV PUTRA MALAYSIA, FAC ENGN, DEPT COMP & COMMUN SYST ENGN, PHOTON LAB, SERDANG 43400, MALAYSIA

Author's E-mail: adzir@ieee.org

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330


Author(s): Sahu, PP (Sahu, P. P.)

Title: Polarization independent thermally tunable erbium-doped fiber amplifier gain equalizer using a cascaded Mach-Zehnder coupler

Source: APPLIED OPTICS, 47 (5): 718-724 FEB 10 2008

Abstract:

A thermally tunable erbium-doped fiber amplifier (EDFA) gain equalizer filter based on compact point symmetric cascaded Mach-Zehnder (CMZ) coupler is presented with its mathematical model and is found to be polarization dependent due to stress anisotropy caused by local heating for thermo-optic phase change from its mathematical analysis. A thermo-optic delay line structure with a stress releasing groove is proposed and designed for the reduction of polarization dependent characteristics of the high index contrast point symmetric delay line structure of the device. It is found from thermal analysis by using an implicit finite difference method that temperature gradients of the proposed structure, which mainly causes the release of stress anisotropy, is approximately nine times more than that of the conventional structure. It is also seen that the EDFA gain equalized spectrum by using the point symmetric CMZ device based on the proposed structure is almost polarization independent. (c) 2008 Optical Society of America.
Addresses: Tezpur Univ, Dept Elect & Commun Engn, Tezpur 784028, Assam, India

Reprint Address: SAHU, PP, TEZPUR UNIV, DEPT ELECT & COMMUN ENGN, TEZPUR 784028, ASSAM, INDIA

Author's E-mail: pps@tezu.ernet.in

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331

Author(s): Desmoulins, S (Desmoulins, Sebastien); Di Teodoro, F (Di Teodoro, Fabio)



Title: High-gain Er-doped fiber amplifier generating eye-safe MW peak-power, mJ-energy pulses

Source: OPTICS EXPRESS, 16 (4): 2431-2437 FEB 18 2008

Abstract:

We report on a large-core, Er-doped fiber amplifier that generates pulses of similar to 1.1ns duration and maximum pulse energy/peak power similar to 1.4 mJ/1.2 MW, at 1567nm wavelength, while concurrently providing optical gain in excess of 25 dB, in a multi-mode output beam (M-2 similar to 8.5). (C) 2008 Optical Society of America.


Addresses: Aculight Corp, Bothell, WA 98021 USA

Reprint Address: DI TEODORO, F, NORTHROP GRUMMAN SPACE TECHNOL, REDONDO BEACH, CA 90278 USA

Author's E-mail: fabio.diteodoro@ngc.com

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332

Author(s): Oh, JM (Oh, Jung Mi); Koo, SG (Koo, Sang Geun); Lee, D (Lee, Donghan); Park, SJ (Park, Soo-Jin)



Title: Enhancement of the performance of a reflective SOA-based hybrid WDM/TDM PON system with a remotely pumped erbium-doped fiber amplifier

Source: JOURNAL OF LIGHTWAVE TECHNOLOGY, 26 (1-4): 144-149 JAN-FEB 2008

Abstract:

A passive optical network (PON) architecture based on a hybrid wavelength-division multiplexing (WDM) and time-division multiplexing (TDM) PON system with a remotely pumped erbium-doped fiber amplifier (EDFA) is presented as an excellent candidate for use in a next-generation optical access network. The remotely pumped EDFA operates as a bidirectional amplifier and provides a 15-dB gain to both upstream signals and seed light sources, so the sensitivity of upstream transmission is greatly improved. An upstream transmission of 1.25 Gb/s with a low seed channel power of -14 dBm is made feasible over a total reach of 25 km for 32-WDM channels and 16-TDM splits by the use of the remotely pumped EDFA. This scheme has advantages that it uses a single transmission fiber for both down- and up-stream signals and that it reduces the Rayleigh scattering contribution.


Addresses: Chungnam Natl Univ, Dept Phys, Taejon 305764, South Korea

Korea Telecom, Adv Technol Labs, Taejon 305348, South Korea

Reprint Address: OH, JM, CHUNGNAM NATL UNIV, DEPT PHYS, TAEJON 305764, SOUTH KOREA

Author's E-mail: dleee@cnu.ac.kr

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333


Author(s): Bahrampour, AR (Bahrampour, A. R.); Telmourpour, MH (Telmourpour, M. H.); Rahimi, L (Rahimi, L.)

Title: A moment method for analysis the gain spectrum in fiber Raman amplifier with broadband pumps

Source: OPTICS COMMUNICATIONS, 281 (4): 587-591 FEB 15 2008

Abstract:

The governing equations of optical fiber Raman amplifier with broadband pumps in the steady state are systems of uncountable non-linear ordinary differential equations (NODE). In this paper, the Moment method is used to reduce the uncountable system of NODE to a system of finite number of NODE. This system of equations is solved numerically. The results are compared with that of the full numerical method. It was shown that the Moment method is a precise and efficient technique for analysis of optical fiber Raman amplifier with broadband pumps. (c) 2007 Elsevier B.V. All rights reserved.
Addresses: Sharif Univ Technol, Tehran, Iran

Shahid Bahonar Univ Kerman, Kerman, Iran

Int Ctr Sci & High Technol & Environm Sci ICST, Kerman, Iran

Reprint Address: BAHRAMPOUR, AR, SHARIF UNIV TECHNOL, TEHRAN, IRAN

Author's E-mail: drbahrampour@yahoo.com

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334

Author(s): Sudmeyer, T (Suedmeyer, Thomas); Imai, Y (Imai, Yutaka); Masuda, H (Masuda, Hisashi); Eguchi, N (Eguchi, Naoya); Saito, M (Saito, Masaki); Kubota, S (Kubota, Shigeo)



Title: Efficient 2(nd) and 4(th) harmonic generation of a single-frequency, continuous-wave fiber amplifier

Source: OPTICS EXPRESS, 16 (3): 1546-1551 FEB 4 2008

Abstract:

We demonstrate efficient cavity-enhanced second and fourth harmonic generation of an air-cooled, continuous-wave (cw), single-frequency 1064 nm fiber-amplifier system. The second harmonic generator achieves up to 88% total external conversion efficiency, generating more than 20-W power at 532 nm wavelength in a diffraction-limited beam (M-2 < 1.05). The nonlinear medium is a critically phase-matched, 20-mm long, anti-reflection (AR) coated LBO crystal operated at 25 degrees C. The fourth harmonic generator is based on an AR-coated, Czochralski-grown beta-BaB2O4 (BBO) crystal optimized for low loss and high damage threshold. Up to 12.2 W of 266-nm deep-UV (DUV) output is obtained using a 6-mm long critically phase-matched BBO operated at 40 C. This power level is more than two times higher than previously reported for cw 266-nm generation. The total external conversion efficiency from the fundamental at 1064 nm to the fourth harmonic at 266 nm is > 50%. (c) 2008 Optical Society of America.


Addresses: Sony Corp, Laser & Opt Dev Dept, Core Technol Dev Grp, Shinagawa Ku, Tokyo 1410001, Japan

Reprint Address: IMAI, Y, SONY CORP, LASER & OPT DEV DEPT, CORE TECHNOL DEV GRP, SHINAGAWA KU, 6-7-35 KITASHINAGAWA, TOKYO 1410001, JAPAN

Author's E-mail: Yutaka.Imai@jp.sony.com

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335

Author(s): Xiao, R (Xiao, R.); Hou, J (Hou, J.); Liu, M (Liu, M.); Jiang, ZF (Jiang, Z. F.)



Title: Coherent combining technology of master oscillator power amplifier fiber arrays

Source: OPTICS EXPRESS, 16 (3): 2015-2022 FEB 4 2008

Abstract:

Coherent beam combination of fiber laser array is an important technology of realize high-power, high-radiance fiber laser system. In this paper, Master Oscillator-Power Amplifier scheme is used to realize phase controlling of three ytterbium fiber amplifiers, the experiment results of both two and three fiber amplifiers are given and compared. Far-field patterns with different fill factor are studied experimentally. We perform optical phase-noise measurements of a commercial 1-W ytterbium fiber amplifier using our phase control electronics, the dominant phase noises of the 1-W fiber amplifier are at frequencies below one kilohertz. (C) 2008 Optical Society of America.


Addresses: Natl Univ Def Technol, Coll Optoelect Sci & Engn, Changsha 410073, Peoples R China

Beijing Inst Radiat Med, Beijing 100850, Peoples R China

Reprint Address: XIAO, R, NATL UNIV DEF TECHNOL, COLL OPTOELECT SCI & ENGN, CHANGSHA 410073, PEOPLES R CHINA

Author's E-mail: ruixiao203@163.com

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336


Author(s): Jamaludin, MZ (Jamaludin, M. Zaini); Abdullah, MK (Abdullah, M. Khazani); Abdullah, F (Abdullah, Fairuz); Abas, AF (Abas, A. Fauzi); Mahdi, MA (Mahdi, M. Adzir); Rahman, F (Rahman, Faidz)

Title: A hybrid high-gain double-pass erbium-doped fiber amplifier with dispersion compensation feedback loop

Source: OPTICS AND LASER TECHNOLOGY, 40 (2): 270-272 MAR 2008

Abstract:

A new double-pass erbium-doped fiber amplifier (DP-EDFA) using chirped fiber Bragg grating (CFBG) is reported here showing a gain of 53.4 dB and noise figure (NF) of 5.36 dB. The proposed amplifier at the same time provides dispersion compensation through the use of CFBG. (c) 2007 Elsevier Ltd. All rights reserved.
Addresses: Univ Tenaga Nasl, Dept Elect Engn, Selangor 43009, Malaysia

Univ Putra Malaysia, Fac Engn, Dept Comp Syst & Commun, Photon Lab, Serdang 43400, Malaysia

Reprint Address: JAMALUDIN, MZ, UNIV TENAGA NASL, DEPT ELECT ENGN, SELANGOR 43009, MALAYSIA

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337

Author(s): Harun, SW (Harun, S. W.); Abdul-Rashid, HA (Abdul-Rashid, H. A.); Muhd-Yassin, SZ (Muhd-Yassin, S. Z.); Abd-Rahman, MK (Abd-Rahman, M. K.); Jayapalan, KK (Jayapalan, K. K.); Ahmad, H (Ahmad, H.)



Title: 37.2 dB small-signal gain from Er/Yb Co-doped fiber amplifier with 20 mW pump power

Source: OPTICS AND LASER TECHNOLOGY, 40 (1): 88-91 FEB 2008

Abstract:

An efficient erbium-ytterbium-doped fiber amplifier (EYDFA) is demonstrated by forward and backward pumping a 3 in erbium/ytterbium co-doped fibers (EYDF) in single- and double-pass configurations using a 20 mW pump. At the input signal wavelength of 1536nm, the forward- and backward-pumped double-pass amplifiers achieved a maximum low-signal gain of 37.2 and 28.6dB and a corresponding noise figure of 5.4 and 10.8 dB, respectively. Whereas, the forward- and backward-pumped single-pass amplifiers (at the same wavelength) achieved a maximum low-signal gain of 20.0 and 22.2dB and a corresponding noise figure of 4.6 and 10.3dB, respectively. The double-pass design offers an economical solution to high-efficiency and high-gain optical amplifiers. (c) 2007 Elsevier Ltd. All rights reserved.


Addresses: Univ Malaya, Fac Engn, Dept Elect Engn, Kuala Lumpur 50603, Malaysia

Multimedia Univ, Fac Engn, Cyberjaya, Malaysia

Univ Teknol MARA, Fac Sci Appl, Shah Alam 40450, Malaysia

Univ Malaya, Photon Lab, Dept Phys, Kuala Lumpur 50603, Malaysia

Reprint Address: HARUN, SW, UNIV MALAYA, FAC ENGN, DEPT ELECT ENGN, KUALA LUMPUR 50603, MALAYSIA

Author's E-mail: wadi72@yahoo.com


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