共查询到9条相似文献,搜索用时 15 毫秒
1.
In this paper, we have investigated wavelength division multiplexed (WDM) hybrid (ring-tree-star) topology. Eight optical add/drop multiplexers (OADMs) are used to make ring structure. The single mode fiber and dispersion compensating fiber and semiconductor optical amplifier (SOA) are employed between each OADM to achieve a maximum. To increase the number of users each OADM node of ring network is connected to star and tree network topology which can accommodate more than 2048 users. Various system parameters (for different channel spacing, different input power signal, different data rates and the fiber length) are varied to investigate the system performance in the term of BER and Q factor. 相似文献
2.
An optical fiber fault location method based on OCDMA coding is proposed, which may locate branch optical fiber fault at local side. The method expands dynamic range through coding gain without influencing event distinction degree. Through simulation, it indicates that dynamic range of the method may support optical fiber fault detection in PON with branching ratio of 1:16 and transmission distance of 20 km, while the distinction degree is about 10 cm. 相似文献
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A cost-saving, crosstalk-free and bidirectional optical add-drop multiplexer (B-OADM) based on cascaded thin-film optical add-drop filters (TFOADFs) with optical circulators as well as the optical protection function promptly restored at the access node for a single-fiber self-healing access ring network are proposed and demonstrated. Using this B-TFOADM configuration, no crosstalk appears on the dropped and added channels, respectively. The bit-error rate performances in this B-OADM are investigated in a 2.5-Gb/s DWDM system, showing no intraband and interband crosstalk-induced power penalties. Such crosstalk-free and bidirectional architecture greatly simplifies the hub complexity as well as the low-cost components at each node are employed. 相似文献
5.
Simultaneous wavelength conversion based on four-wave mixing (FWM) for 10-Gb/s NRZ payload and 2.5-Gb/s OFDM label signals in optical switching network is experimentally demonstrated. The dual-pump scheme based on FWM in semiconductor optical amplifier (SOA) is employed and simultaneous wavelength conversion for optical packet with one optical payload of 10-Gb/s non-return-to-zero (NRZ) on-off keying (OOK) signals and one optical label of 2.5-Gb/s OFDM signals are realized. The bit-error-rate performance is evaluated for both payload and label after wavelength conversion. 相似文献
6.
We propose a novel wavelength adjustable laser (WAL) with a photonic crystal based Fabry-Perot (FP) etalon. This laser will
be a promising light source for optical network units (ONUs) of conventional wavelength-division-multiplexed passive optical
network (WDM-PON) systems for up-stream transmission. It has the merits of a relatively simple fabrication and operation,
wide process tolerance, low-cost, high side-mode suppression ratio, and wavelength-tunable characteristics. The optimization
of the device structure and the implementation methods for this type of laser are discussed. Although the WALs in WDM-PON
systems are not colorless, each laser can cover several wavelengths. Thus, the required number of different ONUs can be reduced.
This approach may be necessary for 10 Gbps upstream transmission in next-generation optical access networks because the 10
Gbps data rate is difficult to achieve by using current colorless schemes. 相似文献
7.
Influence of the bias current on the output characteristics of a mode-locked fiber ring laser consisting of two SOAs 总被引:2,自引:0,他引:2
In this paper, after obtaining the mode-locked pulse shape with self-reproduction theory, the influence of the bias current on the output characteristics of a backward-optical-injection harmonic mode-locked fiber ring laser consisting of two semiconductor optical amplifiers (SOAs) has been numerically investigated. The results show that the mode-locked pulse with high peak power and narrow width can be obtained through reasonably adjusting the bias currents of the two SOAs. 相似文献
8.
In this article, the spectrum sliced dense wavelength division multiplexed passive optical network (SS-DWDM–PON) has been investigated as a power efficient and cost effective solution for optical access networks. In this work an AWG demultiplexer is used to operate as slicing system. The high speed SS-DWDM system has been realized and investigated for 32 channels with data rate up to 3 Gb/s using broadband ASE source (LED). The 3 Gb/s signals both non-return-to-zero (NRZ) and return-to-zero (RZ) were demonstrated in 40 km optical fiber link with BER < 10−12. The results obtained here demonstrate that SS-DWDM is well suited for Fiber-to-the-Home (FTTH) network. 相似文献
9.
Charu Narula 《Optik》2011,122(11):941-944
The effectiveness of the conventional dispersion compensation techniques: DCF, FBG and OPC to use with soliton transmission is presented. The frequency shifts of solitons induced by collisions between different channels in a soliton WDM system can be reduced by dispersion compensation. The reduction mechanism applied is the cancellation of the shifts generated in both normal and anomalous dispersion regimes. It is analyzed that phase jitter can be reduced by the use of midway spectral inversion. 相似文献