At&t Bell Laboratories

American Telephone & Telegraph Co., At&t Bell Laboratories

Utpal K Chakrabarti

George J Zydzik

LeGrand G Van Uitert

Aland K Chin

George J Przybylek

Erin K Byrne

Todd R Hayes

Disclosed is a method of making InP-based DFB lasers that can reliably mitigate or substantially prevent erosion of the grating during overgrowth. The method comprises contacting, prior to overgrowth, the grating with a sulfurcontaining aqueous medium, e.g., 80 parts by weight H.sub.2 O/20 parts by weight ammonium sulfide.

Method of making an INP-based DFB laser

Disclosed is a device including a surface coating for passivation or anti-reflection, and a method of manufacture. The coating comprises ZrO.sub.2 doped with yttrium, magnesium or calcium. The doped ZrO.sub.2 is preferably deposited on the device surface by electron-beam evaporation from a single crystal source of ZrO.sub.2 and Y.sub.2 O.sub.3, MgO or CaO.

Coating for optical devices

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Scotch Plains, NJ, United States of America

Utpal K Chakrabarti