  We report a simple and compact design of a dispersion compensated mode-locked
Yb:fiber oscillator based on a nonlinear amplifying loop mirror (NALM). The
fully polarization maintaining (PM) fiber integrated laser features a chirped
fiber Bragg grating (CFBG) for dispersion compensation and a fiber integrated
compact non-reciprocal phase bias device, which is alignment-free. The main
design parameters were determined by numerically simulating the pulse evolution
in the oscillator and by analyzing their impact on the laser performance.
Experimentally, we achieved an 88 fs compressed pulse duration with sub-fs
timing jitter at 54 MHz repetition rate and 51 mW of output power with 5.5 *
10-5 [20 Hz, 1 MHz] integrated relative intensity noise (RIN). Furthermore, we
demonstrate tight phase-locking of the laser's carrier-envelope offset
frequency (fceo) to a stable radio frequency (RF) reference and of one
frequency comb tooth to a stable optical reference at 291 THz.
