<PAGE>

                                                                    Exhibit 21.1

                                 Subsidiaries
                                 ------------

<TABLE>
<CAPTION>
                              State or other Jurisdiction of
Subsidiary                    Incorporation or Organization
----------                    ------------------------------
<S>                           <C>
Algety Telecom S.A.                      France

Baylight Network, Inc.                   Delaware

Corvis Canada, Inc.                      Quebec

</TABLE>



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