Page 1 of 2 12 LastLast
Results 1 to 10 of 11

Thread: high-speed photodiodes? (~32GHz)

  1. #1
    Join Date
    Nov 2019
    Posts
    2

    Default high-speed photodiodes? (~32GHz)

    I'm looking for high-speed SMD or through-hole photodiodes that are fast enough for ~32GHz bandwidth. The usual suppliers (Mouser,Digikey...) only seem to have 110ps rise time photodiodes which are only good for around 9GHz.
    There are some suppliers of ready units but I'm just looking for the bare diodes. Are such diodes available for purchase or are they expensive components only sold to corporations?

  2. #2
    mixedgas's Avatar
    mixedgas is offline Creaky Old Award Winning Bastard Technologist
    Infinitus Excellentia Ion Laser Dominatus
    Join Date
    May 2007
    Location
    A lab with some dripping water on the floor.
    Posts
    9,478

    Default

    Good Mornin, Krazer...
    Long Time No See...


    https://youtu.be/kerUbfOQTW0?t=37

    Steve
    Last edited by mixedgas; 11-12-2019 at 08:17.
    Qui habet Christos, habet Vitam!
    I should have rented the space under my name for advertising.
    When I still could have...

  3. #3
    Join Date
    May 2009
    Location
    UCSB
    Posts
    709

    Default

    You certainly are not going to find a through-hole 32ghz photodiode (why that is left as an exercise for the reader...), and I have never seen a packaged SMD one for sale above 10G. The good news is that suitable devices do exist and are used in the newer 40G/100G telecom products, the bad news is that these are usually waveguide integrated devices and only work at a narrow band around 1550nm so if you are operating at a different wavelength you are screwed. I bet if you ask nicely newport or thorlabs will sell you a bare chip for only slightly more than the cost of a packaged unit, but you will be on your own for the rf design/wirebonding and optical coupling.

  4. #4
    mixedgas's Avatar
    mixedgas is offline Creaky Old Award Winning Bastard Technologist
    Infinitus Excellentia Ion Laser Dominatus
    Join Date
    May 2007
    Location
    A lab with some dripping water on the floor.
    Posts
    9,478

    Default

    Quote Originally Posted by morgnk View Post
    I'm looking for high-speed SMD or through-hole photodiodes that are fast enough for ~32GHz bandwidth. The usual suppliers (Mouser,Digikey...) only seem to have 110ps rise time photodiodes which are only good for around 9GHz.
    There are some suppliers of ready units but I'm just looking for the bare diodes. Are such diodes available for purchase or are they expensive components only sold to corporations?

    Quote Originally Posted by morgnk View Post
    I'm looking for high-speed SMD or through-hole photodiodes that are fast enough for ~32GHz bandwidth. The usual suppliers (Mouser,Digikey...) only seem to have 110ps rise time photodiodes which are only good for around 9GHz.
    There are some suppliers of ready units but I'm just looking for the bare diodes. Are such diodes available for purchase or are they expensive components only sold to corporations?
    Thorlabs has them down to 35 ps as a catalog item, and faster if you buy a "packaged" OEM part.

    Consider the laboratory manufacturing process for 50 Ghz and low cost used to be :
    ~
    1. Buy a high speed microwave diode in a plastic pill package.
    2. Solder it to a board with properly designed and matched microstrip.
    3. Position a nanosecond pulsed laser based drill over the junction, basically a laser micromachining station.
    4. Drill pulse by pulse till sufficient light response is just obtained by just barely burning through plastic and partially into the gold metallization.
    ~
    I think due to the chip sizes needed to keep junction size down and obtain good matching, it is a "Industry Only" part. HP/Agilent/Broadcom no longer makes the part number referenced in the "DIY" Review of Scientific Instruments paper.
    The fiber optics industry gets them someplace, but that does not mean "Inexpensive"
    ~
    Good Luck...
    ~


    Steve
    Qui habet Christos, habet Vitam!
    I should have rented the space under my name for advertising.
    When I still could have...

  5. #5
    Join Date
    May 2009
    Location
    UCSB
    Posts
    709

    Default

    It's nice to be back, I have a 'real job' now so a lot more time for posting on internet forums than when I was in school

    I always did wonder how well it would work to crack open something like a 40G modulator driver that is wirebonded internal construction and hit it with a short laser pulse. I imagine that the metal layers would make it hard to couple into the interesting parts of the amplifier, but when measuring short pulses one rarely is concerned about photodiode quantum efficiency... I never thought of trying to micromachine away the metal layer, I I might give it a try I ever come across a multistage amp with dead input stage but working output stages.

  6. #6
    Join Date
    Oct 2012
    Location
    Germany
    Posts
    1,320

    Default

    ... removing or "drilling" plastic housings is better done with a "plasma-torch" than with a laser

    Viktor
    Aufruf zum Projekt "Müll-freie Meere" - https://reprap.org/forum/list.php?426
    Call for the project "garbage-free seas" - https://reprap.org/forum/list.php?425

  7. #7
    Join Date
    Nov 2008
    Location
    Cleveland Ohio
    Posts
    2,425

    Default

    Autocorrelator. I get down to 1fs with it.
    Last edited by kecked; 11-18-2019 at 02:21.

  8. #8
    Join Date
    Apr 2021
    Posts
    1

    Default

    Hi...the OPA380 might be excessively delayed for this 30ns beat application. The large number rate is just 80V/us with 100ns settling time.

    You need to track down a trans impedance amp about 10x quicker. The speed will be a component of you input impedance. On the off chance that you attempt to utilize too high an input resistor, the wanderer capacitance will restrict the speed of the speaker. TI has a few plan apparatuses that will help you pick a superior part. Regularly, a course of a couple of speakers, each with lower gain will assist you with getting the speed you need.

    I would search for a 500MHz GBW, 500V/us slew rate and 10ns settling time enhancer.

    pcb assembly in usa
    Last edited by BeliaEllet; 04-16-2021 at 13:05.

  9. #9
    Join Date
    Nov 2008
    Location
    Cleveland Ohio
    Posts
    2,425

    Default

    Quote Originally Posted by BeliaEllet View Post
    Hi...the OPA380 might be excessively delayed for this 30ns beat application. The large number rate is just 80V/us with 100ns settling time.

    You need to track down a trans impedance amp about 10x quicker. The speed will be a component of you input impedance. On the off chance that you attempt to utilize too high an input resistor, the wanderer capacitance will restrict the speed of the speaker. TI has a few plan apparatuses that will help you pick a superior part. Regularly, a course of a couple of speakers, each with lower gain will assist you with getting the speed you need.

    I would search for a 500MHz GBW, 500V/us slew rate and 10ns settling time enhancer.
    I ended up doing it with an autocorrelator so I observed the diffraction pattern and signal off a SHG crystal. Hooked to OSCSOPE. Worked well. Base pulse was 80MHZ with 20 hz chopper rate.

  10. #10
    Join Date
    Jan 2015
    Location
    switzerland
    Posts
    63

    Default teste avec un autocorrélateur

    [QUOTE = kecked; 356383] J'ai fini par le faire avec un autocorrélateur alors j'ai utilisé le diagramme de diffraction et le signal d'un cristal SHG. Accroché à OSCSOPE. Un bien fonctionné. L'impulsion de base était de 80 MHz avec une fréquence de découpage de 20 Hz. [/ QUOTE]


    un petit lien http://www.swissrocketman.fr/mesure-...2c8%2c146.html

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •