Miniature Nd-YAG lasers; Noise and modulation characteristics
Journal Article
·
· Journal of Lightwave Technology; (USA)
- Bellcore, Red Bank, NJ (US)
- Dept. of Electrical and Computer Engineering, Rutgers Univ., Piscataway, NJ (US)
The frequency and intensity noise spectra, as well as the frequency modulation (FM) response of 1320-nm laser-diode-pumped miniature Nd:YAG ring lasers have been measured. The frequency noise spectrum has a resonance peak at the relaxation oscillation frequency of the laser (between 123 and 150 kHz) and is flat beyond 200 kHz with the spectral density of 613 rad{sup 2} {center dot} Hz, much smaller than that of semiconductor lasers; the corresponding laser linewidth is less than 49 Hz. The relative intensity noise is {minus} 140 dB/Hz at the valley and has a resonance peak at the relaxation oscillation frequency of the laser. The FM response is flat from dc to 110 kHz and is in the 0.65--3 MHz/V range; the modulation frequency is limited by the relaxation oscillation frequency of the laser. The small frequency noise makes this laser an excellent source for phase-shift keying coherent lightwave transmission systems. The FM modulation bandwidth is much larger than the linewidth; therefore, phase-locked loops can be constructed using Nd:YAG lasers. Both phase-locked loops and 100-Mbit/s homodyne receives employing miniature Nd:YAG lasers have been demonstrated experimentally.
- OSTI ID:
- 6723157
- Journal Information:
- Journal of Lightwave Technology; (USA), Journal Name: Journal of Lightwave Technology; (USA) Vol. 8:3; ISSN JLTED; ISSN 0733-8724
- Country of Publication:
- United States
- Language:
- English
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