共查询到20条相似文献,搜索用时 31 毫秒
1.
A comprehensive numerical fiber amplifier model has been used to optimize Er3+-Yb3+ codoped active fiber for maximum gain and quantum conversion efficiency (QCE) at large signal operation. The optimum cutoff wavelength of the LP11 mode has been found to increase from 800 mm at low pump powers (≈50 mW) to 1400 mn at pump powers higher than 500 mW. While at low pump powers fibers with higher numerical aperture give higher QCE, at high pump levels better large signal performance is achieved with fibers having lower numerical aperture 相似文献
2.
M.I.M. Ali A.K. Zamzuri A. Ahmad R. Mohamad M.A. Mahdi 《Photonics Technology Letters, IEEE》2006,18(3):493-495
In this letter, we present a report on the experimental validation of double-pass discrete Raman amplifier (DRA) limitation for large signals. It has been proven that the limitation of double-pass Raman amplifier for large signals is due to stimulated Brillouin scattering (SBS) even though with a modulated signal at 10-Gb/s data. The multichannel amplification shows that this limitation can be relaxed due to energy distribution among the channels, the SBS threshold is enhanced. An average gain of 19.2 dB is obtained in four-channel amplification without any significant SBS effects. The double-pass DRA is found suitable for large signals to be deployed in wavelength division multiplexing systems. 相似文献
3.
《Lightwave Technology, Journal of》2008,26(14):2168-2174
4.
《Photonics Technology Letters, IEEE》2009,21(22):1710-1712
5.
Giles C.R. Desurvire E. Talman J.R. Simpson J.R. Becker P.C. 《Lightwave Technology, Journal of》1989,7(4):651-656
The gain, saturation power, and noise of an erbium-doped single-mode traveling-wave fiber amplifier operating at a wavelength λ=1.53 μm are characterized. In continuous-wave (CW) measurements amplification at 2 Gbit/s was demonstrated with up to 17-dB gain for 1×10-9 bit error rate at 1.531 μm and a 3-dB full bandwidth of 14 nm. From the determination of the fiber-amplifier's output signal-to-noise ratio versus input signal power during data transmission, it was concluded that, with signal levels used here, signal-spontaneous beat noise limited the receiver sensitivity improvement. With the fiber amplifier acting as an optical preamplifier of the receiver, the best sensitivity was -30 dBm, obtained after installing a polarizer at the fiber amplifier output to reject half of the applied spontaneous emission power. This sensitivity was 6 dB better than without the fiber amplifier, proving that the fiber amplifier can be used as a preamplifier 相似文献
6.
Rochat E. Costantini D.M. Muller C.A.P. Haroud K. Limberger H.G. Dandliker R. Salathe R.P. 《Photonics Technology Letters, IEEE》2000,12(9):1162-1164
An all-fiber phase-modulated master oscillator power amplifier for free-space coherent communication is presented. A distributed-feedback fiber laser at 1.06 μm is used as master oscillator. A novel phase modulator based on a ZnO-coated single-mode fiber modulates the single frequency communication signal. The modulated signal is then amplified in a double-clad doped fiber power amplifier. Up to 1 W cw single-frequency output power, phase modulated at 196 MHz, has been obtained 相似文献
7.
Fady I. El-Nahal 《光电子快报》2017,13(1):67-69
We investigate a wavelength-division-multiplexing passive optical network (WDM-PON) with centralized lightwave and direct detection. The system is demonstrated for symmetric 10 Gbit/s differential phase-shift keying (DPSK) downstream signals and on-off keying (OOK) upstream signals, respectively. A wavelength reused scheme is employed to carry the upstream data by using a reflective semiconductor optical amplifier (RSOA) as an intensity modulator at the optical network unit (ONU). The constant-intensity property of the DPSK modulation format can keep high extinction ratio (ER) of downstream signal and reduce the crosstalk to the upstream signal. The bit error rate (BER) performance of our scheme shows that the proposed 10 Gbit/s symmetric WDM-PON can achieve error free transmission over 25-km-long fiber transmission with low power penalty. 相似文献
8.
《Solid-State Circuits, IEEE Journal of》1986,21(3):417-423
Equalizing amplifiers for gigabit optical fiber transmission systems requires a 65-dB gain (S21) with a gigahertz bandwidth. However, this gain has the potential to cause significant parasitic oscillation. Consequently, developing a useful stabilization design technique is a very important factor in attaining practical design. In this paper, stabilization design techniques are described for circuit configurations, packaging, and stability assessment. In addition, fabrication results of amplifier IC based on bipolar super self-aligned process technology (SST) and new wide-band high isolation package with coaxial-like 50-/spl Omega/ signal lines are also shown. A 65-dB gain, 1.3-GHz bandwidth single-chip amplifier has been successfully fabricated. 相似文献
9.
Multi-Gb/s silicon bipolar clock recovery IC 总被引:1,自引:0,他引:1
A novel clock recovery IC for optical fiber communication systems with data rates up to several Gb/s is presented. It combines nonlinear signal preprocessing directly with a regenerative frequency divider scheme and an external filter in the divider loop. Hence, the center frequency of the filter and the working frequency of the amplifier are halved. The extracted clock frequency corresponds to half the bit rate, as required for many clocked circuit components within fiber optic lines. Two versions of the same IC design, scheduled for two bit rate ranges between 0.3-4 Gb/s, are realized with a conventional Si bipolar process. Clock recovery is demonstrated at 2.2 and 3.52 Gb/s, using both cavity and surface acoustic wave (SAW) filters 相似文献
10.
Widely tunable wavelength converter using a double-ring fiber laser with a semiconductor optical amplifier 总被引:1,自引:0,他引:1
Widely tunable wavelength conversion has been demonstrated using broad-band orthogonal-pump four-wave mixing in a semiconductor optical amplifier placed at the intersection of two fiber ring lasers. The all-optical wavelength converter operates without using any external pump source. A 3-dB conversion-range over 40 nm is obtained. The measured power penalty is 1.5 dB for a 2.5-Gb/s converted signal at 10/sup -9/ bit error rate. 相似文献
11.
Nakazawa M. Tanifuji T. Tokuda M. Uchida N. 《Quantum Electronics, IEEE Journal of》1981,17(7):1264-1269
A new backscattering technique for diagnosing the attenuation characteristics, spatial imperfections with length (fault location), and splice loss in a single-mode optical fiber has been developed by using a TeO2 acoustooptical light deflector operating at 120 MHz. Due to the small insertion loss and high extinction ratio of the deflector, the dynamic range of the backscattered signal has been increased by at least 10 dB, which corresponds to the extension of 5 km in measurable length for fiber loss of 1 dB/km, compared with the conventional back-scattering technique in which the beam splitter and polarizer-analyzer combination are utilized. Another advantage of this technique is in that the saturation of the amplifier is avoided by arbitrarily cutting off a large power in the early stage of the Rayleigh scattering signal. A single-mode fiber of 19.2 km in length has been examined, and the distance for fault location up to 18.4 km was obtained. 相似文献
12.
Wang S.J. Kuo C.Y. Parayanthal P. Shen T.M. Melley M.P. Hartman R.L. 《Photonics Technology Letters, IEEE》1990,2(12):920-922
A multiple-quantum-well distributed-feedback (MQW-DFB) laser with narrow linewidth and low frequency chirp at low output power may experience linewidth rebroadening at high output power. the rebroadening is mostly due to a large carrier-induced change of refractive index, which also causes a large frequency modulation response for the MQW-DFB lasers. Using a 1.55-μm MQW-DFB laser, a 622-Mb/s amplitude-shift-keying (ASK) transmission experiment employing 200-km of fiber and an erbium-doped fiber amplifier has been demonstrated having a dispersion power penalty less than 9.8 dB. The receiver sensitivities at BER=10-9 of the ASK system are -34.5 dBm and -42.5 dBm for 1.7-Gb/s and 622-Mb/s modulation, respectively. A 622-Mb/s incoherent frequency-shift-keying (FSK) transmission experiment using the same laser has also achieved a receiver sensitivity of -42.5 dBm 相似文献
13.
《微纳电子技术》1990,(4)
本文报导了140Mb/s混合集成光接收机中所使用的AGC信号放大模块研制结果。此模块为二、三、四次群光通信接收机中的功能模块。它包括主放大器输出信号的平均值检波器、控制二极管衰减器的AGC信号放大器、接收机所接收到的光电平的指示器以及PIN-FET前置放大器过载指示器。该模块采用厚膜混合集成方法将电路密封在DHM24型24引线标准膜电路绝缘子壳内。外形尺寸32.9×20.2mm~2。它体积小,可靠性高,与PIN-FET前放。AGC主放大模块连接后,在实用化的586B线路码型四次群光纤通信系统中,在误码率为10~(-9)下,接收灵敏度为-39dBm,并得到较好的眼图。 相似文献
14.
The authors study the effects of noise when erbium-doped fiber amplifiers are used as signal boosters for signal distribution in amplitude modulation, vestigial-sideband (AM-VSB) subcarrier multiplexed lightwave cable television (CATV) systems. A procedure for finding the amplifier length required to achieve a desired carrier-to-noise ratio at the receiver, while maximizing the allowed post-amplifier splitting ratios and transmission losses has been developed. A simple and easy-to-use approach that circumvents the computationally intensive optimization procedure and allows the design of systems whose performance is very close to optimal is discussed 相似文献
15.
P.B. Hansen G. Raybon J.M. Wiesenfeld C.A. Burrus R.A. Logan T. Tanbun-Ek H. Temkin 《Photonics Technology Letters, IEEE》1991,3(11):1018-1020
A semiconductor laser amplifier (SLA) has been employed successfully for optical demultiplexing in two-channel optical time division multiplexed system experiments at 6 and 2 Gb/s. Demultiplexing of 6-Gb/s (2-Gb/s) signals was demonstrated with a power penalty of 1.6 dB (3.0 dB) at bit error rates of 10/sup -9/. It is also shown that a reduction of the generated amplified spontaneous emission can be obtained by optical gating/demultiplexing for systems incorporating inline amplifiers. A 0.5-dB improvement in sensitivity was achieved as a result of using an SLA for demultiplexing from 2.0 to 1.0 Gb/s in a system with one inline Er/sup 3+/-doped fiber amplifier.<> 相似文献
16.
Ultra-wide-band tellurite-based fiber Raman amplifier 总被引:2,自引:0,他引:2
We describe the first wide-band tellurite-based fiber Raman amplifier (T-FRA) for application to seamless ultra-large-capacity dense wavelength-division multiplexing (WDM) systems. First, we confirmed that the Raman scattering characteristics of the tellurite-based fiber has so large a gain coefficient and Stokes shift that we can achieve a wide-band tellurite-based fiber Raman amplifier with a shorter fiber length than when using silica-based fiber. Second, we investigated the small signal gain and the signal transmission characteristics for a high gain and high output power operation with a single-stage amplifier. Focusing on double Rayleigh scattering, we compared the high gain limit of tellurite- and silica-based fibers. We then studied the impact of nonlinear effects by measuring the bit error rate (BER) when using a two-stage amplifier with a high output power of 18.8 dBm in which we simultaneously amplified eight channel signals in the L-band located on the ITU 100-GHz grid. Finally, we designed a wide-band tellurite-based fiber Raman amplifier with a multiwavelength band pumping scheme. We constructed this amplifier with a tellurite-based fiber only 250 m in length pumped by four-wavelength-channel laser diodes, and it provided a 160-nm bandwidth with a gain of over 10 dB and a noise figure below 10 dB from 1490 to 1650 nm. We also measured the BER to confirm the transmission characteristics of the amplifier for single channel operation over the whole signal wavelength range of 160 nm. We thus confirmed that the amplifier could be employed in ultra-high-capacity WDM systems. 相似文献
17.
Ju Han Lee You Min Chang Young-Geun Han Sang Hyuck Kim Haeyang Chung Sang Bae Lee 《Photonics Technology Letters, IEEE》2005,17(1):43-45
We experimentally demonstrate a novel concept of the dispersion-compensating Raman/erbium-doped fiber amplifier hybrid amplifier recycling residual Raman pump for increase of overall power conversion efficiency. The proposed dispersion-compensating hybrid amplifier system has only one pump source for Raman amplification in the dispersion-compensating fiber (DCF) and the residual pump power after the DCF is recycled for secondary signal amplification in an erbium-doped fiber cascaded to the DCF. Using the proposed scheme, we achieve the significant enhancement of both signal gain and effective gain-bandwidth by 15 dB (small signal gain) and 20 nm, respectively, compared to the performance of the Raman-only amplifier. 相似文献
18.
Akatsu Y. Miyagawa Y. Miyamoto Y. Kobayashi Y. Akahori Y. 《Photonics Technology Letters, IEEE》1993,5(2):163-165
A high-sensitivity, monolithically integrated optical receiver, composed of a p-i-n-PD and high electron mobility transistors (p-i-n-HEMTs) is described. The receiver sensitivity is -17.3 dBm at a bit error rate of 1×10-9 for a 10-Gb/s non-return-to-zero (NRZ) lightwave signal. This value is the best result yet reported for 10-Gb/s monolithically integrated receivers. The sensitivity is -30.6 dBm if an erbium-doped fiber amplifier (EDFA) is placed ahead of the p-i-n-NEMT receiver. A transmission experiment using a 150-km dispersion-shifted fiber (DSF) indicates no degradation in the bit error rate characteristics or the eye pattern. This verifies the practicality of the p-i-n-HEMT optical receiver for high-speed transmission systems 相似文献
19.
The limitations of cascaded in-line amplifier systems using coherent modulation-demodulation schemes are examined by evaluating the product of the data rate and the transmission distance. The linear amplified spontaneous emission (ASE) accumulation is shown to make the maximum value of the data rate-distance product increase proportionally with the ratio of the amplifier output signal power to the noise figure. It is also shown that the Kerr-nonlinearity-induced phase noise limits the product of the data rate and the third power of the distance, the maximum value of which is inversely proportional to both the amplifier output signal power and the noise figure. The fiber dispersion is known to limit the product of the distance and the square of the data rate by causing waveform distortion. By taking these three relations into account, it is concluded that coherent signal transmission has a maximum in-line amplifier system length of 103-104 km in the gigabit-per-second range. Among these three factors, the nonlinearity-induced phase noise has the greatest impact 相似文献
20.
Theoretical analysis of system limitation for AM-DD/NRZ opticaltransmission systems using in-line phase-sensitive amplifiers 总被引:1,自引:0,他引:1
This paper shows the theoretically derived performance of single channel, amplitude modulation/direct detection optical transmission systems using in-line optical phase-sensitive amplifiers (PSA's). The calculations take into account the degradation of the signal-to-noise power ratio (SNR) and intersymbol interference (ISI) due to the distortion of transmitted signal pulses. The SNR is analyzed by considering not only amplifier noise and fiber loss but also noise enhancement by four-wave mixing in the transmission fiber. The ISI is estimated by eye-pattern degradation of the transmitted signal numerically calculated using the nonlinear Schrodinger equation. The regenerative repeater spacing of in-line PSA systems limited by SNR and ISI can be expanded by approximately 3 to 10 times that of in-line EDFA systems, in the case of |D|⩽0.1 ps/mn/km dispersion fiber systems transmitting a 40-Gb/s signal 相似文献