BS EN 62572-3-2014 pdf download.Fibre optic components and devices Reliability standards
Part 3: Laser modules used for telecommunication.
This BS EN 62572-3 (where required by the specification) gives the minimum mandatory requirements and is part of a total laser reliability and quality assurance procedure adopted by the laser module manufacturer.
It also provides guidance on the activities of system suppliers and system operators and provides feedback on field performance to laser module manufacturers and system suppliers.
The laser module manufacturer shall be capable of demonstrating, by means of qualification approval of devices, technology approval or capability approval of the manufacturing process.
a) a documented and audited manufacturing process including the qualification of purchased components in accordance with an internationally recognized quality management system:
b) a performance qualification programme, including for example, accelerated life testing, burn-in and screening of components and modules:
C) a qualification maintenance programme to ensure continuity of reliability performance; d) a procedure to provide feedback on reliability issues to development and production.
4.2 Testing responsibilities
4.2.1 General
The testing detailed in Tables 1 and 2 is to be performed by the laser module manufacturer and component suppliers (where applicable). Additional testing may be specified in the specification.
4.2.2 RecommendatIon applicable to laser customer/system supplier
The system supplier is recommended to have a programme to analyse and verify the results including failure analysis. This programme includes an independent life test of fully packaged laser modules (see Table 2. test 1 and/or test 2 and 3 and/or test 5 (sample size >10 per test)).
4.2.3 Recommendation applicable to system operator
The system operator is recommended to have a programme to monitor and report field failure rates in sufficient detail to enable the system supplier and laser module manufacturer to initiate any necessary corrective actions at an early stage in the lifetime of a product.
Suppliers may have different approaches (i.e. to reliability concepts) during the development of product maturity and resource limitations may dictate testing strategies.
Alternative tests and activities to those specified are permitted, provided the LMM/SS/SO can show intent to remove end-product failures and the associated failure mechanisms. However, this will require significant data to substantiate compliance.
4.3 Quality improvement programmes (QIPs)
Quality improvement programmes (QlPs) shall be initiated with component suppliers and customers (SOs, SSs and LMMs) to address non-compliances (including quality and reliability problems identified during subsequent service life of the laser). The correction of noncompliances and subsequent QIPs are a required strategy to minimize reliability risks, The operation of QIPs should be stated in the quality approval (QA) generic and capability approval documents.
5 Tests
5.1 General
The tests described in Tables 1 and 2 are designed to accelerate the main failure mechanisms known to be reliability hazards in laser modules (see IEC TR 62572-2). Where appropriate, the CQC shall demonstrate an ability to reduce end product failure mechanisms. Final product validation is required to demonstrate that CQCs are operating at the boundaries of the process or technology. These tests will reduce the risk of unreliable components entering system use and will enable estimates to be made of the distribution of laser lifetimes and hence the laser failure rates.
The sample size and level of testing may vary depending on the business volume between the laser customerlsystem supplier (SS) and laser module manufacturer (LMM). This information will be given in the capability approval (CA) document and the specification where appropriate.
It is essential that the lasers evaluated are entirely representative of standard production devices and have passed all the production andlor specified (where applicable in the specification) burn-in and screening procedures.
These tests will normally be performed by the laser manufacturer as part of an initial qualification programme.
Table 2 — Maintenance of qualification
These tests cover periodic monitoring performed on production devices to ensure that the quality and reliability performance established during initial qualification is maintained or improved.
5.2 Structural similarity
Where a range of laser modules is produced by a laser manufacturer, there may be some significant structural similarity between different type codes. A combination of results from different test programmes, where appropriate, is therefore permitted.
Consideration should be given to the fact that minor differences in technology or processing can have a major impact on reliability, whilst not being apparent during quality assessment.
Evidence shall be presented which demonstrates that all results are directly relevant.
5.3 Burn-in and screening (when applicable in the specification)
NOTE See IEC TR 62572-2.
The screening test should be designed by the laser module manufacturer specifically for his particular technology. Any approach based on similarity to that which is performed by other manufacturers is good for comparison purposes, but can be ineffective in achieving the actual screening goal. This is particularly true for fibre optic components whose technology is not yet mature and varies significantly from supplier to supplier.
Where a manufacturer can demonstrate component and process stability, screening procedures may be revised.BS EN 62572-3-2014 pdf download.