Lasers in OTDR (optical time-domain reflectometry)
An optical time-domain reflectometer (OTDR) is an optoelectronic instrument used to characterize, troubleshoot and maintain optical networks. OTDR testing is done by injecting a series of optical pulses into the fiber under test, and characterizing the scattered or reflected light.
The laser light pulse travels in the fiber and experiences reflections from defects, splices and connectors. The reflected light signal is directed to a sensitive photodetector, which is suitable for detecting the light emitted by the laser diode. As the speed at which the light propagates in the fiber is known as well as the time when the light pulse is sent into the fiber, the distance that the pulse has traveled can be calculated giving the position of defects in the fiber as well as the length of fiber.
An OTDR device contains a laser diode source, a photodiode detector and a highly accurate timing circuit (or time base). Lasers used in OTDR are commonly Fabry-Pérot (FP) type, sometimes Distributed Feedback (DFB). Wavelengths most commonly used are 1310 nm, 1490 nm, 1550 nm, 1625 nm, and 1650 nm.
Modulight has had inhouse laser design and production since year 2000. Combined with our industry-leading quality control and traceability we can serve even the most demanding laser customers. Our OTDR lasers are available as chips, TO-can lasers, or fiber-coupled modules.
Thanks to our inhouse design and production we are able to customize laser chips and modules to meet customer-specific requirements. If you can’t find a perfect match from the below lists of our standard product, just contact us and let our engineering team design a tailored solution for you. Modulight vertically integrated approach allows us to provide lasers for most demanding applications within a short turnaround time.
Fiber-coupled OTDR laser modules
Lasers ready to use
Fiber-coupled coaxial or butterfly packaged laser modules are the easiest choice for OTDR equipment builders. Both package options are industry standard choices.
OTDR lasers in TO-can package
For fiber-coupling or free-space use
TO-56 is the go-to package for pulsed transmitter lasers such as the OTDR application requires. The laser beam output can be from a flat, aspherical or ball lens.
OTDR laser unmounted chips
Chips are great for customers building their own systems
As an original semiconductor laser manufacturer, Modulight can also provide OTDR lasers as unmounted bare die chips. We can also tailor you a custom laser if you need a different wavelength or otherwise different product.
Fiber-coupled OTDR lasers
Modulight has two alternative packages for fiber-pigtailed OTDR lasers; a coaxial pigtailed package with a tiny footprint, and a slightly larger but more versatile 14-pin butterfly package. The package details can be found from the datasheets, which you can access by clicking the link on the product code.
|Wavelength||1310 nm||1310 nm||1490 nm||1550 nm||1625 nm||1625 nm||1650 nm|
|Optical Output Power *)||180 mW||180 mW||70 mW||125 mW||80 mW||90 mW||30 mW|
TO-can OTDR lasers
Modulight’s OTDR lasers are available in an industry standard package, a TO-56. Most products have a simple flat lens cap. The package details can be found from the datasheets, which you can access by clicking the link on the product code.
|Wavelength||1310 nm||1490 nm||1550 nm||1625 nm||1625 nm||1625 nm||1650 nm|
|Optical Output Power *)||300 mW||180 mW||200 mW||150 mW||100 mW||100 mW|
OTDR laser chips (bare die)
Although our most popular products in the OTDR range include the fiber-pigtailed and TO-can packaged lasers, Modulight can provide unmounted (bare die) chips for customers who prefer to do the mounting and packaging themselves.
|Wavelength||1310 nm||1310 nm||1490 nm||1550 nm||1550 nm||1625 nm||1625 nm||1650 nm||1650 nm|
|Optical Output Power *)||300 mW||100 mW||180 mW||200 mW||100 mW||150 mW||100 mW||80 mW||100 mW|
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