  Compact and robust frequency-stabilized laser sources are critical for a
variety of fields that require stable frequency standards, including field
spectroscopy, radio astronomy, microwave generation, and geophysical
monitoring. In this work, we applied a simple and compact fiber ring-resonator
configuration that can stabilize both a continuous-wave laser and a
self-referenced optical frequency comb to a vibration-insensitive optical fiber
delay-line. We could achieve a thermal-noise-limited frequency noise level in
the 10 Hz - 1 kHz offset frequency range for both the continuous-wave laser and
the optical frequency comb with the minimal frequency instability of 2.7x10-14
at 0.03-s and 2.6x10-14 at 0.01-s averaging time, respectively, in non-vacuum
condition. The optical fiber spool, working as a delay reference, is designed
to be insensitive to external vibration, with a vibration sensitivity of
sub-10-10 [1/g] and volume of 32 mL. Finally, the ring-resonator setup is
packaged in a palm-sized aluminum case with 171-mL volume with a
vibration-insensitive spool, as well as an even smaller 97-mL-volume case with
an ultra-compact 9-mL miniaturized fiber spool.
