What is DD IEC/PAS 61280-2-10 — Laser transmitters testing about?
DD IEC/PAS 61280-2-10 is an international standard that discusses the test procedures for fibre optic communication subsystem.
DD IEC/PAS 61280-2-10 sets forth standard procedures for measuring time-resolved chirp on laser transmitters. The calculation of alpha-factor, a measure of transient chirp, is derived from the measured TRC data.
DD IEC/PAS 61280-2-10 also covers a means to verify the TRC setups and calculations (Annex A) and a review of laser modulation methods
DD IEC/PAS 61280-2-10 specifies the relationship of TRC to performance in a transmission system.
Who is DD IEC/PAS 61280-2-10 — Laser transmitters testing for?
DD IEC/PAS 61280-2-10 on laser transmitters testing is relevant to:
- Designers and manufacturers of laser transmitters
- Suppliers and exporters of laser transmitters
- Telecommunication industries
- Fibre optic technicians
- Fibre optic installers
- Testing authorities
- Electrical engineers and electronics engineers
- Manufacturers of pattern generators, monochromators, and optical oscilloscopes
Why should you use DD IEC/PAS 61280-2-10 — Laser transmitters testing?
Understanding the effects of the chirp on the transmission of signals is of great importance to the system designer. Chirp can have two separate outcomes in transmission systems. The first is that the chirp can interact with the fibre dispersion to broaden or narrow the pulse along with the fibre. The second is that chirp can broaden the transmitted spectrum limiting the channel spacing by interfering with adjacent channels in an ultra-dense WDM environment, even at short-haul distances.
DD IEC/PAS 61280-2-10 provides you with test methods such as the frequency discriminator method, monochromator method, etc. for the measurement of the chirp. It also explains the alpha-factor calculations for laser transmitters, as the sign of the penalty depends upon both the sign of the chirp and the sign of the fibre dispersion.
Measuring chirp penalty directly is difficult because it requires a chirp-free transmitter with the identical intensity pattern as the device under test (DUT).
Thus, DD IEC/PAS 61280-2-10 leads many transmitters and system designers as well as manufacturers to estimate the chirp (or dispersion) penalty using time-resolved chirp data directly or with derived chirp parameters that are either modelled or measured.
DD IEC/PAS 61280-2-10 proves to be beneficial to its users as it contributes to designing the lower cost transmitters that enable bringing the cost of DWDM transmission systems down.
Overall, DD IEC/PAS 61280-2-10 is useful to users as it provides guidance on time-resolved chirp and alpha-factor measurement of laser transmitters, as controlling the amount of chirp present in these lower-cost transmitters is key to their success in the network.
