Dispersion and noise of 1. 3-. mu. m multimode lasers in microwave digital systems

Journal Article · Mon May 01 04:00:00 EDT 1989 · Journal of Lightwave Technology; (USA)

DOI:https://doi.org/10.1109/50.19118· OSTI ID:5233826

Hakki, B W; Bosch, F ^[1]; Lumish, S ^[2]

---

1. AT and T Bell Labs., Allentown, PA (US)
2. AT and T Bell Labs., Holmdel, NJ (USA)

The intensity noise and the performance in a 1.7 Gbit/s digital system of 1.3{mu}m InGaAsP multilongitudinal mode lasers were studied. The total intensity noise, mode partitioning, and the impact of dispersion on optical noise were measured. It was found that under CW conditions the total stimulated emission from unpackaged lasers was inherently quiet, with an integrated optical signal-to-noise ratio (SNR) of 26.8 +- 1.5 dB over a bandwidth of 1.5 GHz and at 5 mW/facet. The optical SNR was found to decrease as a function of increasing reflection. Intense mode partitioning decreased the SNR of the main mode by --20 dB and reduced the effective coherence length to -- cm in glass fiber. At 1.7 Gbits/s, the power penalties associated with laser bias and fiber dispersion are reported.

• OSTI ID: 5233826
• Journal Information: Journal of Lightwave Technology; (USA), Journal Name: Journal of Lightwave Technology; (USA) Vol. 7:5; ISSN JLTED; ISSN 0733-8724
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426002* -- Engineering-- Lasers & Masers-- (1990-)
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
DESIGN
DIGITAL SYSTEMS
DISPERSION RELATIONS
ELECTROMAGNETIC RADIATION
EMISSION
ENERGY-LEVEL TRANSITIONS
LASERS
MICROWAVE RADIATION
MODE SELECTION
OPTIMIZATION
RADIATIONS
SIGNAL-TO-NOISE RATIO
STIMULATED EMISSION