Fiber-delay-line-refereneed optieal frequeney eombs:three stabilization schemes

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We demonstrate the stabilization of an optical frequency comb[OFC]using a segment of fiber delay line as a reference.A mode-locked Er-doped fiber laser is phase locked to a kilometer-long fiber delay line using three different schemes.The short-term stability of the comb modes in the OFC stabilized by these schemes is obviously enhanced,down to the 10-12 level at millisecond average time.Among these three schemes,phase locking two bunches of comb modes in the OFC to the same fiber delay line exhibits the lowest residual phase noise.Fiber-delay-line-referenced OFCs can provide reliable laser sources in precise metrology owing to the advances of low cost,compactness,and high integration.
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