Adjustable Optical Power Light Source JW3120 — Joinwit.

Shanghai Joinwit developed the JW3120, a light source that emits a maximum of six wavelengths beneath a color screen sized 3.5 inches. Power dials continuously across a 15dB span, output appears on either one channel or two, and the wavelength names itself automatically once a Joinwit power meter sits at the far end, so fiber link loss readings come out quick and precise.

Users can calibrate the unit themselves, tweak output power without steps interrupting, and choose CW or modulated emission; every setting reads clearly on that color display.

Defaults sit at 1310nm and 1550nm, spectral width stays inside 5nm, output runs from -5 down to -20dBm, and each adjustment step moves 0.05dB. Stability holds within 0.05dB at 25 degrees Celsius across a 15-minute window. Modulation offers CW alongside 270Hz, 330Hz, 1kHz, 2kHz. The FC/PC connector swaps easily for SC or ST, and a red source inside puts out 10mW. Power comes from a 4000mAh pack at 3.7V, good for more than 25 hours continuous, with Micro USB carrying communication. Storage runs from -25 up to +70 degrees Celsius, working temperature sits between -10 and +60 degrees Celsius, and the case at 180 x 88 x 44mm weighs 370g at most.

Typical duties take in upkeep of fiber networks and digital data networks, along with teaching and research in optical communication.

Optical transmission equipment testing, communication room build-out and fiber cable inspection are among the optical measurement jobs that Shanghai Joinwit Optoelectronic Technology Co., Ltd. covers. Knowledge covering light source control plus optical power detection lets the company supply standardized instruments and, where an application demands it, technical cooperation and custom development.