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* Question :What do OPA¡B SOA ¡B RA ¡B EDFA¡B PDFA men ??
* What is "USB" ?
* What's the difference between USB 2.0 and USB 1.1?
* What's the key benefit when I use USB?
* How shall I choose a good Oscilloscope smartly?
* Why shall I choose a scope with long memory (deep record length)?

What do OPA, SOA, RA, EDFA, PDFA men ??
There are three kinds of optical amplifier
  1. Optical Fiber Amplifier (OPA)
  2. Semiconductor Optical Amplifier (SOA)
  3. Raman Amplifier (RA)

And OPA included two kinds of amplifiers

  1. Erbium Doped Fiber Amplifier (EDFA)
  2. Praseodymium Doped Fiber Amplifier (PDFA)

EDFA will be most popular for most of application today.

What is "USB" ?
USB is Universal Serial Bus (USB) is a connectivity specification developed by Intel and other technology industry leaders. USB provides ease of use, expandability, and speed for the end user ¡CUSB is arguably the most successful interconnect in computing history. Originally released in 1995 at 12 Mbps, USB today operates at 480 Mbps and can be found in over 2 billion PC, CE, and mobile devices. In addition to high performance and ubiquity, USB enjoys strong consumer brand recognition and a reputation for ease-of-use.

What's the difference between USB 2.0 and USB 1.1?

Answers: There are two version of USB today, one is USB 2.0, and the other is USB 1.1. USB 1.1 was developed since Sep. 1998. USB 2.0 is a revised version and extension for USB 1.1. USB 2.0 covers most key features but it increases the data throughput from 12 Mb/s of old USB 1.1 to 480 Mbs/s!! 48 times!! We can see new USB 2.0 provide the following features:

  • Higher performance interface capability
  • Support all USB 1.1 connector
  • USB 2.0 hub can be used with the method of device by device to optimize the transmission speed.
  • High speed signal mode
  • Better capability to detect high speed signal.
  • Support to detect the signal when USB device is off.
  • Confirm the USB power consumption standard.

What's the key benefit when I use USB?

Wide coverage as a universal interface standard for most devices today :
USB owned a wide coverage like printer, communication, display, audio, data storage etc and it becomes a universal bus already in the world.

  • Plug and play: This is key feature for USB; we won't need any IRQ interrupt, I/O address, and DMA system source when we used USB.
  • Hot attach and detach capability

5. How shall I choose a good Oscilloscope smartly?
The criteria to choose a good scope will depend on the signal situation of device under test (DUT) and actual requirement from users.
There are several kinds of oscilloscope in the world today and we break it down as following:
  • Digital storage Oscilloscope(DSO): it differs from traditional oscilloscope and equipped with ? auto measurement? capability , this capability enable it can shows all important measurements parameters on scope's LCD screen, that's simplified the measurement reading way than ever, and it also support the storage on oscilloscope , users can store several kinds of waveforms, set up data in their memories of digital storage oscilloscope., That is helpful for scientist, professor, engineers to generate report, comparison for historical data to make analysis. Particularly we should pay high attention to auto measurement capability of DSO, some manufacture push? DSO? without auto measurement capability with lower cost. Actually it's ? RSO( real time storage oscilloscope) , like Germany Hameg the made only RSO today , and some users felt very confusing when their distributor told them it's a DSO !! some key features of DSO are summarized as following
    * Auto measurement
    * Waveforms and set up storage
    * Real time sampling ( or called single shot sampling)and repetitive sample) or called equivalent time sampling)
  • Oscilloscope (or called Analogue oscilloscope): It's a traditional oscilloscope, it only support CRT screen display and without the capability to shows auto measurement parameters on its screen for easier reading. Users still have to calculate the actual value of signal by observe the scale and ratio, it looks a little bit stupid in the modern world today!

Why shall I choose a scope with long memory (deep record length)?
"Long memory" Application will be used when design engineer, professor or students who need to observe a tiny zone of irregular signals with low time base scale. The long memory has to be with high repetitive sampling capability, it will make sense at only this situation.