Semight-SUPPORT-FAQ-Semight Instruments

Q&A

Common Problem

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？Q

What wavelengths does single-mode VOA optical attenuation support?

A

The default factory calibration wavelength is 127012901310133014901550.
？Q

What is the type of single-mode VOA interface?

A

The default is UPC (if APC is required, special instructions are required).
？Q

Does single mode VOA support reverse direction?

A

No, it can only be input and output.
？Q

Why is there a correspondence between the wavelength and the wavelength ID in the C # DLL library provided by the single-mode VOA, and how to obtain a wavelength ID?

A

The wavelength ID is calibrated according to the sequence of all the acquired wavelength lists, and the wavelength ID is calibrated from 1.
Therefore
a. You need to obtain the wavelength list calibrated by the current device through the function querywavelengthlist (uint32 deviceid), as follows:

The waveengthid corresponding to the wavelength 1270 is 1, and the waveengthid corresponding to the wavelength 1310 is 3.
b. And then set the wavelength, attenuation, etc. according to the obtained waveengthid corresponding to each wavelength.
？Q

Why does single-mode VOA have large insertion loss or inaccurate power monitoring?

A

(1) : First check whether the fiber end face flange end face is dirty (you can use the end face detector to check the state of the end face), and then clean the lower end face with a cleaning pen or a face tag.
(2) : Check whether the input / output flange core is damaged.
？Q

Why can't single-mode VOA USB & network ports communicate?

A

(1). First check whether the device is switched to remote mode. The single-mode VOA can be programmed only after manually pressing the "remote / local" button on the front panel for a long time to enter the remote mode (PS: the default mode is local mode after startup). The remote interface is as follows:

(2) . If the device has entered remote mode
a. If it is USB communication: first check whether the serial port driver is installed. You can go to the device manager to see whether the corresponding COM port can be recognized normally.
b. For network port communication: ensure that the device IP and the PC Ethernet IP are in the same network segment (the default factory IP is 192.168.1.8 port: 20108). You can read and set the device IP on the info interface through the USB connection GUI.
？Q

Why does a single-mode VOA display only incoming optical power but not optical power after receiving light?

A

First check whether the optical path of the lower channel is in the light off state. If the corresponding channel displays block (as shown below), it means it is in the off state. You can set the light off by pressing the shutter button on the front panel for a short time
？Q

What is the difference between open-loop attenuation mode and closed-loop attenuation mode of single-mode VOA?

A

The attenuator has an output optical power monitoring function,
Closed loop mode indicates PD monitoring
(input power + input power offset) - (ATT + att offset) = output power + output power offset.
Open loop mode means no power monitoring. We use calibration attenuation to set ADC value to control attenuation value
The closed-loop mode has high accuracy and long stability.
？Q

Why do some channels of single-mode VOA display locked mode and some channels display open-loop attenuation mode? How to switch modes?

A

There are three modes of single-mode VOA: power locking mode, open-loop attenuation mode and closed-loop attenuation mode.
Long press the mode switch button on the front panel to switch modes.
PS: refer to the operation manual for the meaning and operation of other front panel buttons.

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