Exhibit 21.1

SUBSIDIARIES

Bookham Technology plc, a UK corporation

Onetta, Inc., a Delaware corporation

Bookham (US), Inc., a Delaware corporation

Ignis Optics, Inc., a Delaware corporation (100% owned by Bookham Technology, Inc.)

Bookham Technology KK, a Japanese corporation

Bookham (Canada), Inc., an Ottawa, Canada, corporation

Bookham Exchange, Inc., a New Brunswick, Canada, corporation (100% owned by Bookham (Canada), Inc.)

Bookham (Switzerland) AG, a Swiss corporation

Bookham International Ltd., a Cayman Islands corporation

Bookham Technology (Shenzhen) (FFTZ) Co. Ltd., a People’s Republic of China corporation (100% owned by New Focus International Ltd.)

New Focus Pacific (SHIP) Co. Ltd., a People’s Republic of China corporation (100% owned by New Focus International Ltd.)

New Focus, Inc., a Delaware corporation

Focused Research, Inc., a California corporation (100% owned by New Focus, Inc.)

New Focus FSC, Inc., a Barbados corporation (100% owned by New Focus, Inc.)

New Focus GmbH, a German corporation (100% owned by New Focus, Inc.)

Globe Y. Technology, Inc., a California corporation (100% owned by New Focus, Inc.)