The Antitrust Div. of the US Department of Justice has requested additional information and documentary material relating to the planned merger of JDS Uniphase Corp. of Nepean, Ontario, Canada, and E-Tek Dynamics Inc. of San Jose, Calif., under the Hart-Scott-Rodino Antitrust Improvements Act of 1976. The companies believe the merger will be completed in the second calendar quarter of 2000 as planned. Under the proposed $15 billion merger, which was announced in January, E-Tek would become a wholly owned subsidiary of JDS Uniphase.