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首页> 外文会议>Optical Coherence Imaging Techniques and Imaging in Scattering Media >Frequency Sweep Jitter and Wander of a Vernier-Tuned Distributed Bragg Reflector (VT-DBR) Laser at 1550 nm in OCT Applications
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Frequency Sweep Jitter and Wander of a Vernier-Tuned Distributed Bragg Reflector (VT-DBR) Laser at 1550 nm in OCT Applications

机译：OCT应用中游标调谐的分布式布拉格反射器（VT-DBR）激光器在1550 nm处的扫频抖动和漂移

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摘要

The short-term jitter and longer-term wander of the frequency sweep profile of a Vernier-Tuned Distributed Bragg Reflector (VT-DBR) laser at 1550 nm used in OCT applications is characterized in this work. The VT-DBR has demonstrated success in source-swept OCT (SSOCT), performing both intensity [1] and phase-sensitive [2] OCT. The purpose of this paper is to investigate one of the unique aspects of the VT-DBR laser that makes it successful in OCT: the stability of the linear optical frequency sweep of the source. Jitter measurements of the optical frequency sweep are recorded using a 3-cavity 100 GHz free spectral range (FSR) solid etalon. A gas absorption reference cell is used for wander characterization. We report that the VT-DBR jitters by no more than 82 MHz RMS in optical frequency while sweeping at an 8 kHz repetition rate. Longer-term wander provides insight into the accuracy of the VT-DBR self-calibration routine which produces an intrinsically linear optical frequency sweep. Over an 8-hour data collection period, the system maintains a linear sweep with an optical frequency step of 105 MHz per 2.5 ns with +/- 3 kHz per 2.5 ns (+/- 0.03%) peak-to-peak deviation. We find that the absolute frequency drifts by 325 MHz (2.6pm) over the same 8-hour period with ambient temperature fluctuations of no more than 5 ℃. Results show that using calibration with a gas reference cell, picometer absolute wavelength accuracy of the laser can be achieved at any time for a single sweep. Stability and accuracy limits are thought to be due to electronic drive circuitry in the current design.
机译：这项工作的特点是，OCT应用中使用的游标调谐分布式布拉格反射器（VT-DBR）激光器在1550 nm处的频率扫描曲线的短期抖动和长期漂移。 VT-DBR在源扫描OCT（SSOCT）中表现出了成功，它同时执行强度[1]和相敏[2] OCT。本文的目的是研究使其成功进行OCT的VT-DBR激光器的独特之处之一：光源线性光学频率扫描的稳定性。使用3腔100 GHz自由光谱范围（FSR）固态标准具记录光频扫描的抖动测量值。气体吸收参比池用于漂移表征。我们报告说，VT-DBR在以8 kHz重复频率扫描时，在光频率上的抖动不超过82 MHz RMS。长期徘徊可深入了解VT-DBR自校准程序的准确性，该程序可产生固有的线性光学频率扫描。在8小时的数据收集周期内，系统保持线性扫描，光频阶跃为每2.5 ns 105 MHz，峰峰值偏差为每2.5 ns +/- 3 kHz（+/- 0.03％）。我们发现，在相同的8小时周期内，绝对频率漂移325 MHz（2.6pm），且环境温度波动不超过5℃。结果表明，通过使用气体参比池进行校准，可以在单次扫描的任何时间获得皮秒计的绝对波长精度。稳定性和精度限制被认为是由于当前设计中的电子驱动电路引起的。

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