Optimized 25Gb/s Electroabsorption Modulated Tunable Lasers for O-band DWDM Systems

Líu, Hao; Sun, Zhenxing; Wang, Lei; Xiao, Rulei; Zhang, Anxu; Lv, Kai; Feng, Lipeng; Deng, Jing; Huo, Xiaoli

doi:10.1109/icocn55511.2022.9901153

Cited by 2 publications

(1 citation statement)

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“…With the development of tunable laser technology, infrared wavelength lasers with a wide tuning range (in the order of nanometers) have become readily available [ 22 , 23 , 24 ]. The application of tunable infrared lasers in dense wavelength division multiplexing (DWDM) systems has greatly increased the number of communication channels [ 25 ], and the minimum wavelength spacing between two bands is as small as 0.2 nm. The narrow-band interference filter, which is used to isolate different wavelength signals, plays a crucial role in DWDM.…”

Section: Introductionmentioning

confidence: 99%

Online Testing Method for the Fine Spectral Characteristics of Narrow-Band Interference Filters Based on a Narrow-Linewidth Tunable Laser

Ji,

Yang,

Lin

et al. 2024

Sensors

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The transmission spectrum of a narrow-band interference filter is crucial and highly influenced by factors such as the temperature and angle, thus requiring precise and online measurements. The traditional method of measuring the transmission spectrum of an interference filter involves the use of a spectrometer, but the accuracy of this method is limited. Moreover, placing a narrow-band interference filter inside a spectrometer hinders real-time online measurements. To address this issue, there is demand for high-precision online spectral testing methods. In response to this demand, we propose and experimentally validate a fine spectral characterization method for narrow-band interference filters. This method uses a narrow-linewidth tunable laser, achieving a spectral resolution in the MHz range for online testing. Two types of narrow-band interference filters were tested using the constructed laser spectroscopy experimental system, obtaining a transmission spectrum with a spectral resolution of 318 MHz. In comparison to spectrometer-based methods, our proposed method demonstrates higher spectral accuracy, enables online measurements, and provides more accurate measurements for special spectral interference filters. This approach has significant application value and promising development prospects.

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