{'fraction_non_alphanumeric': 0.017892644135188866, 'fraction_numerical': 0.0019880715705765406, 'mean_word_length': 5.3, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Coherence effect on the measurement of optical fiber nonlinear coefficient in continuous-wave dual frequency method

We examined the source coherence effect on the optical fiber nonlinear coefficient measurement in a direct continuous-wave dual frequency method. Highly coherent dual frequency source was constructed with an external cavity laser diode and an acousto-optic frequency shifter. In a highly coherent case, we obtained nonlinear coefficients of -3 % higher than those of an incoherent case.