Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1998-01-20
2000-10-24
Chan, Jason
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359133, 359161, 359177, 359349, H04J 1402
Patent
active
061376051
ABSTRACT:
It is the object of the invention to provide a WDM optical transmission system, in which the transmission performance of the system is optimized by keeping an optical power per an optical signal constant, independent of the number of the optical signals. An alternating current (AC) voltage of a frequency f.sub.1 is supplied to a burst generator, and control bursts S.sub.1 to S.sub.n (frequency f.sub.1) with different transmitting times are generated by the burst generator. These control bursts are respectively supplied to laser diodes (LDs) provided with control circuits, and directly modulate the output of the LDs. Moreover, the output of the LDs are respectively modulated by external optical modulators, multiplexed by an optical coupler and emitted to an optical fiber. The optical amplification repeaters detects the number (n) of the bursts and so controls its output power that an optical power of each of the WDM optical signals maintains a predetermined level independent of the number (n) of the optical signals.
REFERENCES:
patent: 5463487 (1995-10-01), Epworth
patent: 5995274 (1999-11-01), Sugaya et al.
Chan Jason
Lieu Vu
NEC Corporation
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