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                                                                 EXHIBIT 10.103




                              [SPECTRAN LETTERHEAD]


November 5, 1996


Mr. John R. Sicotte
Manager, NA Sales & Engineering
Corning Incorporated
Telecommunications Products Division
Corning, NY 14831


Dear John,

Thank you for your June 28, 1996 letter dated October 17, 1996 requesting
additional multimode fiber purchase amounts pursuant to Section 1.1 of our
Supply Agreement. As we discussed, SpecTran confirms that it will supply to
Corning, and Corning confirms that it will purchase from SpecTran, [******]
kilometers of multimode fiber [**********************************************
***************]. As a result, [**********************************************
******************************************************************************
**************************] under our Supply Agreement.

Should additional amounts of multimode fiber become available for sale to
Corning in [****], SpecTran agrees to notify Corning of such availability as 
soon as practical. Your request [******************************************] in 
the third paragraph of your October 17, 1996 letter is too restrictive and we 
are not able to add it to our Agreement.

Also pursuant to Section 1.1 of our Supply Agreement, SpecTran commits to supply
to Corning and Corning commits to purchase from SpecTran [********************
************************]. On or before [*******************] SpecTran agrees to
notify Corning [***************************************************************
*************************************************].

These additional commitments by Corning and SpecTran increase the minimum amount
of multimode fiber to be purchased by Corning and supplied by SpecTran under our
Supply Agreement from [****************************************]. All other
terms and conditions of our Supply Agreement will remain unchanged.

Please acknowledge your agreement to the terms detailed in this letter by
signing below, faxing the signed letter back to me by Monday, November 11th, to
be followed by one original copy as soon as possible. Please feel free to call
me at (508) 347-8534 if you have any questions.



Sincerely yours,

/s/ Edward T. Connor
- ----------------------------
Edward T. Connor
Vice President, Sales & Marketing

cc:  Dr. Raymond E. Jaeger
     Thomas L. Shillinglaw, Esq.
     Ira S. Nordlicht, Esq.


     AGREED TO AND ACCEPTED
     CORNING INCORPORATED


     /s/ Wendell P. Weeks
By: ____________________________________

      Wendell P. Weeks
Name: __________________________________

       Vice President & Gen. Manager
       Telecommunications Products Div.
Title: _________________________________

       11/26/96
Date: __________________________________

[****] Confidential Treatment Granted