Accounting policies (Tables)

12 Months Ended

Jun. 29, 2012

Accounts Receivable from Individual Customers that were Equal to or Greater Than Ten Percent of Accounts Receivable

Accounts receivable from individual customers that were equal to or greater than 10% of accounts receivable as of June 29, 2012 and June 24, 2011 were as follows:

	June 29, 2012			June 24, 2011
JDS Uniphase Corporation		17	%		23	%
Oclaro, Inc.		15			14
Opnext, Inc.		15			10
EMCORE Corporation		12			11
Finisar Corporation		*			10

* Less than 10% of total accounts receivable as at the end of period.

Property Plant and Equipment Estimated Useful Life

Depreciation is calculated on the straight-line method to write off the cost of each asset to its residual value over its estimated useful life as follows:

Building and building improvements	10 - 30 years
Leasehold improvements	Lower of useful life or lease period
Manufacturing equipment	3 - 5 years
Office equipment	5 years
Motor vehicles	5 years
Computer hardware	3 - 5 years