业界精度的多波长计
作为加拿大 EXFO公司的一家子公司的Berleigh公司，是一家世界著名的波长计生产厂家。从1972年成立至今，一直致力于波长的精确测量。其多波长计WA－7600精度达0.2ppm，是多波长计的计量标准，同业达一个量级。WA－7600、WA－7100广泛应用于大学、研究所、光纤通信的研发、生产企业以及DWDM的系统测试。
WA－7600、WA-7100可以进行如下项目的测量：
1.波长的测量：光波长及谱宽的精确测量，ITU-T grid 中心波长的测量
2. 功率的测量：峰值功率、积分功率的测量
3. 光信噪比测量
4. DWDM系统及器件的测试，可以同时分析测量多达256个通路的通道特性
5. 波长、功率漂移测量以及实时监控
WA－7600、WA－7100具有如下优势：
1. 业界波长精度，测量置信度（3s）。WA－7600精度为0.2ppm。其经济型WA－7100的波长精度亦是优于同业的值 两倍（1ppm）。具有内置的HeNe激光器用于连续的波长校准。波长计精确度优于±0.02pm。基于Michelson 干涉仪原理，长达20多年的制造经验。自动的色散、温度和压力校正。
2. 波长及功率的测试可以上溯至NIST认证标准。EXFO公司采用K.Nakagawa等人提出的使用乙炔气体的吸收谱作为1.5mm频带的测量基准，这一工作已得到NIST认证成为波长测量的标准。
3. 高的光谱分辨率：高达30pm(4GHz)的光谱分辨率，不仅是现在DWDM系统(100GHz/50GHz)理想的测试工具，同时可以用于未来25GHzDWDM系统的测试。
4. 三种测试模式可同时进行：频谱模式、数据模式、监控模式。
5. 大彩色显示屏，图形界面用于显示光谱曲线，可以方便地对曲线进行详尽地分析。
6.快速的测试：1秒钟内完成所有项目的单次测量。
7. 设备接口齐全：除提供标准串、并口及显示、打印接口外，同时提供GPIB接口以及LabViewLabWindows应用。
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附－英文原版的说明
WA-7600 and WA-7100 Optical Channel Analyzers employ proven scanning Michelson interferometer-based Wavemeter technology to determine the absolute wavelength of an optical signal under test by comparing its interference fringe pattern with that of a built-in HeNe laser wavelength standard. Unlike other wavelength meters, all factors that can affect wavelength measurement are accounted for, ensuring the highest possible accuracy. The absolute wavelength specification has a confidence level of 3 σ, meaning 99.6 % of measurements fall within specification limits. To ensure accuracy, all Wavemeter systems are traceable to recognized standards.
Simultaneous Wavelength and Power Measurement
Combining proven scanning Michelson interferometer-based technology with advanced digital processing results in the ability to measure and differentiate the absolute wavelengths of up to 256 discrete optical signals. The accuracy of these measurements is ± 0.3 pm. What’s more, the WA-7600 can simultaneously measure the individual powers of the optical signals. In addition to the WA-7600, EXFO also offers the WA-7100 Wavemeter Multiline Optical Channel Analyzer. Identical to the WA-7600, it offers an absolute wavelength uncertainty of ± 1.5 pm, providing a lower-cost alternative.
High-Resolution Optical Spectral Analysis
Unlike other multiwavelength meters, the WA-7600 and WA-7100 Wavemeter provide the full optical spectrum on a clear, easy-to-read display, for the most precise DWDM channel analysis. Spectral resolution is as high as 30 pm, resulting in a narrow, sharp-edged spectral response. Discrimination between closely spaced DWDM channels is easily achieved for current 100 GHz and 50 GHz channel spacing and future 25 GHz channel spacing.
Automatic Calculation Increases Productivity
The WA-7600 and WA-7100 automatically process measurement data, providing critical DWDM system performance information. In addition to resolving the individual optical carriers and accurately confirming their wavelengths and powers, the WA-7600 and WA-7100 calculate parameters such as channel spacing and OSNR.
