Recent content by fuyejun

From above opinion the thermistor is used to TEC to cooling . So the current for Laser diode is fixed for example 85mA, it will not change.

Hi Dlgoff: I am reading a book at library it's named "fiber optics" by Robert j.Hoss at the page 55 there is a figure names conceptual drawing of a packaged laser transmitter. Fiber cable coupled with a laser diode then there is a Back-facet detector ( I think it is a photo...

Hi Mike: I am using such laser for a narrow band wavelength at 1550nm, So the cooler is needed. Do you know, when datasheet says pin 1 2 functions thermistor. Does it means it inbuilt a thermistor in the module. -Johnny

Hi： I'm going to buy a DFB laser for my project, when I looked for Datasheet of such kind of laser, They give dimensions and equivalent schematic, and pin connections. For example: A 14 pin butterfly[NEC LASER DIODE NX8563LA Series], from the datasheet, pin 1 and 2 functions...

I read it from a book, there 2 kind of modulation, direct modulation and external modulation, so I think when use direct modulation such 2 currents should be concerned ,bcs, it add "ONE" at "ZERO" current. In external modulation, laser act as a CW (continuous wave) so there is no...

Hi: I confused about the follow things, why people say a laser has bias current and modulation current. why a laser has modulation current?