Graphene-based passively mode-locked bidirectional fiber ring laser

Mamidala, V, Woodward, RI, Yang, Y, Liu, HH and Chow, KK (2014) Graphene-based passively mode-locked bidirectional fiber ring laser. Optics Express, 22 (4). pp. 4539-4546. ISSN 1094-4087

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Abstract

We present an all-fiber bidirectional passively mode-locked soliton laser with a graphene-based saturable absorber for the first time to the best of our knowledge. Our design includes a four-port circulator to introduce different sections of cavity for the two counter-propagating pulses, so they have distinct output characteristics. Simultaneous bidirectional operation is achieved by appropriately adjusting the net cavity birefringence and loss. In the clockwise direction, the laser emits ~750 fs pulses at 1561.6 nm, with a repetition rate of 7.68 MHz. In the counter clockwise direction, the central wavelength, pulse width, and repetition rate are 1561.0 nm, ~850 fs, and 6.90 MHz, respectively. © 2014 Optical Society of America.