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Technology Stocks : Lightpath Technologies: LPTH New WDM player

LPTH 10.21

-17.8%

Jan 26 3:59 PM EST

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To: craig crawford who wrote (241)	10/28/1997 1:09:00 AM
From: Tim Bagwell	Read Replies (1) of 1219

Craig, here are some little factoids for you regarding LN modulators which I have been peripherally involved with in the past. LN is a very unusual crystal that has many troublesome characteristics. With regard to modulators one problem that occurs is that the bias point of the modulator drifts with time. The source of this drift is not understood well but is related to the surface preparation of the crystal. External circuitry is usually needed to correct for the drift but it introduces some limitations of its own. Light polarization must be controlled going into the modulator which adds cost. I estimate the world-wide market for modulators between 20,000 to 40,000 per year in 1997. LN modulator are also made by IOC (in UK) and Sumitomo. LN modulators will compete with integrated modulators for bit rates below 10 Gb/s.Integrated modulators are new and are fabricated on the same chip as the laser. At 10 Gb/s and above LN mods work much better and can go much to much higher speeds. While LLNL is a very competent organization they must share their technology with virtually any company that wants it.

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