DocumentCode :
2795351
Title :
Heterodyne optical beat interference limitations on wavelength division multiplexed networks
Author :
Xin, W. ; Antoniades, N. ; Stern, T.E. ; Yang, E.S.
Author_Institution :
Columbia University, New York, NY
fYear :
1995
fDate :
7-9 Aug. 1995
Firstpage :
68
Lastpage :
69
Abstract :
In Wavelength Division Multiplexed (WDM) / Subcarrier Multiplexed (SCM) networks, information is transmitted by modulating a radio frequency subcarrier, which in turn is used to intensity modulate an optical signal. When the signals from two or more lasers operating in a WDM/SCM system are combined at a detector, optical beat interference occurs at a frequency equal to the difference in optical frequencies of the lasers. If this beat signal occurs at a frequency near a subcarriers frequency, it will interfere with the information being transmitted. In this paper we report an experimental results of beat interference from two different optical carriers and show that the results agree with an analytical model we developed. By changing the temperature of a Laser we were able to tune its wavelength resulting in different beat interference over the dc to 12 GHz region we measured, since the beat interference center frequency is the difference in wavelength of the two lasers. When designing a WDM network, one has to take into account the optical beat interference of different optical carriers to achieve an acceptable bit error rate (BER) or SIR. In our case, to achieve 30 dl3 SIR we need to keep the optical carriers at least 9 GHz apart which corresponds to 0.72 Angstrum, indicating a rather poor spectral efficiency.
Keywords :
High speed optical techniques; Optical crosstalk; Optical fiber networks; Optical interferometry; Optical mixing; Optical modulation; Radio frequency; Radiofrequency interference; Spectral analysis; Wavelength division multiplexing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Flat Panel Display Technology/Technologies for a Global Information Infrastructure/ICs for New Age Lightwave Communications/RF Optoelectronics, 1995 Digest of the LEOS Summer Topical Meetings
Conference_Location :
Keystone, CO, USA
Print_ISBN :
0-7803-2448-X
Type :
conf
DOI :
10.1109/LEOSST.1995.764199
Filename :
764199
Link To Document :
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