We present a multi-channel delay sampling method to extend imaging depth in high-speed swept-source optical coherence tomography (SS-OCT). A balanced detector captures interference signals, converting them into electrical signals, which are then split into N channels, each with fixed time delays determined by the length of electrical cables. Then, they are digitized by an N-channel acquisition card. A calibration procedure is utilized to compensate for non-uniform phase shifts resulting from fixed time delays. The N-channel signals are merged in k-space and resampled to obtain a linearized spectrum, which increases the sampling rate by a factor of N, thereby extending the ranging distance by N times, all without altering k-clock triggering or sacrificing other imaging performance. The signal-to-noise ratio and sensitivity within the original depth range also have been enhanced. This advancement contributes to the improvement of the overall performance of SS-OCT systems.

中文翻译：

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多通道延迟采样可扩展高速扫频源 OCT 系统中的成像深度

我们提出了一种多通道延迟采样方法来扩展高速扫频源光学相干断层扫描（SS-OCT）中的成像深度。平衡探测器捕获干扰信号，将其转换为电信号，然后将其分为 N 个通道，每个通道具有由电缆长度决定的固定时间延迟。然后，它们被N通道采集卡数字化。校准过程用于补偿由固定时间延迟引起的不均匀相移。 N通道信号在k空间中合并并重新采样以获得线性化频谱，从而将采样率提高N倍，从而将测距距离延长N倍，所有这些都无需改变k时钟触发或牺牲其他成像表现。原始深度范围内的信噪比和灵敏度也得到了增强。这一进步有助于提高 SS-OCT 系统的整体性能。