OXFORDSHIRE, England, May 24 -- Bookham Technology plc announced today it is acquiring Onetta Inc., a Sunnyvale, Calif., provider of optical amplifier modules and subsystems for communications networks, in an all-share transaction valued at $23.3 million. The announcement was a made a week after Bookham said it will eliminate 600 jobs -- about a third of its work force -- at its Paignton, England, facility. Bookham will acquire all of Onetta's privately held shares in exchange for 27.6 million shares of Bookham's stock, at a market price of about $0.85 per share. 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