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Technology Stocks : LAST MILE TECHNOLOGIES - Let's Discuss Them Here -- Ignore unavailable to you. Want to Upgrade?

To: Frank A. Coluccio who wrote (6272)	1/15/2000 8:05:00 PM
From: Curtis E. Bemis	Read Replies (1) \| Respond to of 12823

Frank-- Let me help you out here with NRZ and RZ. They are different in the electrical (voltage) domain and in the optical domain. In the electrical, Non-Return-to-Zero, NRZ simply means that transitions from logical 1 (V+) to logical 0 (V-) cross zero voltage (and vice-versa). RZ in electrical simply means that the transition stays at zero voltage for a while before the next transition. In the optical domain, there is no such thing as "negative light" or photons. Here, NRZ means that a change of logical level, 0->1 or 1->0 change at the edge of a bit period. RZ means that the light pulse is narrower than the bit period. A logical 1, light on, in RZ, has light for about 1/3 of the bit period with 2/3 light off; logical 0, light off, has the entire bit period with light off. Now for the soliton regime--- That is characterized by high power narrow pulses and that is always RZ optical. Soliton pulse injection are very narrow pulses, about 50 psec or less.