Abstract
A dual-frequency light source at 1550 nm with widely tunable frequency difference is proposed and experimentally demonstrated. Two beams are split from the same single-frequency source and then modulated by two parallel single-side-band (SSB) modulators respectively for +1-order or -1-order sideband. The dual-frequency light source is obtained by recombining the two sidebands. In this scheme, the wide bandwidth of SSB modulator guarantee the widely tunable frequency difference. Simultaneously, the parallel SSB modulators construction makes it true that the dual-frequency light source with low minimum beat frequency can be easily obtained. A dual-frequency light source with 40 kHz to 30 GHz tunable frequency difference is experimentally demonstrated in this work. The signal-to-noise ratio (SNR) of beat signals is over 30 dB. Meanwhile the standard deviation of frequency differences in 100 min is 0.9234, 2.42194 and 5.59017 for dual-frequency all-fiber laser with 100 MHz, 25 GHz and 50 kHz frequency difference respectively.
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