Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-01-02
1997-09-30
Chin, Wellington
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
375293, 371 55, H04B 1000
Patent
active
056731302
ABSTRACT:
A data transmitter (12) transmits parallel data as light pulses over multiple optical channels (14). A data receiver (16) converts the light pulses back to a voltage level and compares the voltage level to a reference capacitor voltage (42). The capacitor voltage should maintain a mid-range value for proper noise margin in detecting logic ones and logic zeroes. Any long series of consecutive logic ones or zeroes causes the capacitor voltage to charge or discharge toward the same level as the data voltage, which causes data errors. To prevent the data errors, the data is encoded (18) by inverting certain bits to break up the long series of consecutive logic states. The encoding information is transmitted as a transmitted clock to the data receiver over another fiber optic channel. The decoding information is retrieved (20) so that the encoded data can be converted back to proper logic states.
REFERENCES:
patent: 4317207 (1982-02-01), Fujimura et al.
patent: 4888791 (1989-12-01), Barndt, Sr.
patent: 5550864 (1996-08-01), Toy et al.
Chun Christopher K. Y.
Schwartz Daniel B.
Shook Stephen G.
Sundstrom Ray D.
Atkins Robert D.
Bacares Rafael
Chin Wellington
Motorola Inc.
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