0000001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 9952156 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY link:presentationLink link:calculationLink link:definitionLink 9952157 - Disclosure - INTERIM FINANCIAL STATEMENTS link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - REVENUE link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - INTEREST AND OTHER INCOME, NET link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - CASH EQUIVALENT, SHORT-TERM AND LONG-TERM INVESTMENTS link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - FAIR VALUE MEASUREMENTS link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - INVENTORIES link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - OTHER BALANCE SHEET DETAILS link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - DERIVATIVE INSTRUMENTS link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - SHORT-TERM AND LONG-TERM DEBT link:presentationLink link:calculationLink link:definitionLink 9952169 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) link:presentationLink link:calculationLink link:definitionLink 9952170 - Disclosure - EARNINGS PER SHARE CALCULATION link:presentationLink link:calculationLink link:definitionLink 9952171 - Disclosure - STOCKHOLDERS’ EQUITY link:presentationLink link:calculationLink link:definitionLink 9952172 - Disclosure - SHARE-BASED COMPENSATION EXPENSE link:presentationLink link:calculationLink link:definitionLink 9952173 - Disclosure - SEGMENTS AND ENTITY-WIDE DISCLOSURES link:presentationLink link:calculationLink link:definitionLink 9952174 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 9952175 - Disclosure - SUBSEQUENT EVENTS link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - REVENUE (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - INTEREST AND OTHER INCOME, NET (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - CASH EQUIVALENT, SHORT-TERM AND LONG-TERM INVESTMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - FAIR VALUE MEASUREMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - INVENTORIES (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - OTHER BALANCE SHEET DETAILS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - SHORT-TERM AND LONG-TERM DEBT (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - EARNINGS PER SHARE CALCULATION (Tables) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - SHARE-BASED COMPENSATION EXPENSE (Tables) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - SEGMENTS AND ENTITY-WIDE DISCLOSURES (Tables) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - REVENUE - Schedule of Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - REVENUE - Schedule of Geographical Distribution of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - REVENUE - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - REVENUE - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - REVENUE - Schedule of Revenue by Major Customers (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - REVENUE - Schedule of Contract Balances (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - REVENUE - Schedule of Deferred Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - SIGNIFICANT ASSET IMPAIRMENT AND RESTRUCTURING COSTS - Schedule of Restructuring Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - INTEREST AND OTHER INCOME, NET -Schedule of Interest and Other Income, Net (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - CASH EQUIVALENT, SHORT-TERM AND LONG-TERM INVESTMENTS - Schedule of Available-for-Sale Securities Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - CASH EQUIVALENT, SHORT-TERM AND LONG-TERM INVESTMENTS - Schedule of Available-for-Sale Securities Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - CASH EQUIVALENT, SHORT-TERM AND LONG-TERM INVESTMENTS - Schedule of Legal Maturities of Debt Investments (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - FAIR VALUE MEASUREMENTS - Schedule of the Fair Value of Assets and Liabilities Recorded on a Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities as Presented on Ciena's Condensed Consolidated Balance Sheets (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities as Presented on Ciena's Condensed Consolidated Balance Sheets (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - INVENTORIES - Schedule of Inventories (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - INVENTORIES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - OTHER BALANCE SHEET DETAILS - Schedule of Accrued Liabilities and Other Short Term Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - OTHER BALANCE SHEET DETAILS - Schedule of Product Warranty Liability (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - DERIVATIVE INSTRUMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - SHORT-TERM AND LONG-TERM DEBT - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - SHORT-TERM AND LONG-TERM DEBT - Schedule of Net Carrying Values of Term Loans (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - EARNINGS PER SHARE CALCULATION (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - STOCKHOLDERS’ EQUITY (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - SHARE-BASED COMPENSATION EXPENSE - Schedule of Share-Based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - SHARE-BASED COMPENSATION EXPENSE - Schedule of Share-Based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - SHARE-BASED COMPENSATION EXPENSE - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - SEGMENTS AND ENTITY-WIDE DISCLOSURES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - SEGMENT AND ENTITY WIDE DISCLOSURES - Schedule of Segment Profit (Loss) and the Reconciliation to Consolidated Net Income (Loss) (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - SEGMENT AND ENTITY WIDE DISCLOSURES - Schedule of Reconciliation of Assets from Segment to Consolidated (Details) link:presentationLink link:calculationLink link:definitionLink 9955551 - Disclosure - SEGMENT AND ENTITY WIDE DISCLOSURES - Schedule of Ciena's Geographic Distribution of Revenue and Long-lived Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955552 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) link:presentationLink link:calculationLink link:definitionLink 9955553 - Disclosure - SUBSEQUENT EVENTS (Details) link:presentationLink link:calculationLink link:definitionLink