Bound soliton (BS) states, as an interesting physical phenomenon operating at multi-pulse mode, are intensively investigated both theoretically and experimentally. However, the BSs have rarely reported in bidirectional fiber ring lasers. Here, we demonstrated a bidirectional passively mode-locked all-fiber ring laser with BSs output at 1.55 μm. The laser is mode-locked by a single-wall carbon nanotube absorber. Two synchronous single-soliton pulses in clockwise and counter-clockwise directions were delivered simultaneously from the laser, which could be transferred to the two-soliton bound states. The bidirectional operations showed the same BS states with phase differences of -π∕2, 0, and π.
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