The 8939FCA and 8939FCB are bi-directional optical CWDM multiplexer/demultiplexer boards for the 2 RU GeckoFlex chassis. They are used where multiple signals need to be sent over one fiber. When used together, these flexible boards are designed to multiplex up to 16 fiber optic signals onto a single fiber.
Each passive optical board supports SD-SDI, HD-SDI, and 3G-SDI signals from GeckoFlex boards equipped with SFP (small form-factor pluggable) CWDM optical transmitters and will handle up to 3 Gb/s. Standard receivers can be used on each output for the receive function with each board separating the light into its discrete wavelengths. These boards can be used both on the transmit, launch side, or the receive side of the cable.
With the 8939FCA board, the eight main optical ports can be used to accept CWDM wavelength lasers where each signal uses a specific wavelength of light. The expansion port can accept or deliver an additional 1310 nm wavelength signal for 9:1 multiplexing. GeckoFlex fiber-ready boards can be equipped with CWDM fiber transmitters for ultra-compact multiplexed optical capability.
The 8939FCA can also be used with the 8935FCB board to increase the number of optical channels to 16 which can be transmitted over one single-mode fiber cable.
Supported Frame Types
0.0 Watts (passive) – single-slot one piece rear mount
8939FCA: 8-channel CWDM channels: 1470 nm, 1490 nm, 1510 nm, 1530 nm, 1550 nm, 1570 nm, 1590 nm, 1610 nm
8939FCB: 8-channel CWDM channels: 1310 nm, 1330 nm, 1350 nm, 1370 nm, 1390 nm, 1410 nm, 1430 nm, 1450 nm
Expansion port wavelength coverage: 1260nm > 1450nm
8-channel insertion loss: 2.25 dB max.
Expansion port insertion loss: 1.25 dB max.
8-channel link loss: 4 dB max.
Adjacent channel isolation: 35 dB typical
Non-adjacent channel isolation: 50 dB min.
Polarization dependant loss: 0.1 dB max.
Optical return loss: 50 dB min.
Optical ripple: 0.5 dB max.
Thermal stability: 0.005 nm/°C
Channel uniformity 8ch: 1.25 dB typical
Storage temperature: -10 to +70°C
Operating ambient temperature: -40 to +85°C
The CWDM SFP transmitter submodule devices used on 8935CF and the SFP receiver used on 8935FC modules (or other fiber-ready GeckoFlex modules) used in conjunction with the 8939FCA and 8939FCB support the following frequencies supporting data rates up to 3 Gb/s:
|Model||Transmitter Frequencies Supported|
|SFP-CWDM3G-1||1470 nm||1490 nm|
|SFP-CWDM3G-2||1510 nm||1530 nm|
|SFP-CWDM3G-3||1550 nm||1570 nm|
|SFP-CWDM3G-4||1590 nm||1610 nm|
|SFP-CWDM3G-5||1310 nm||1330 nm|
|SFP-CWDM3G-6||1350 nm||1370 nm|
|SFP-CWDM3G-7||1390 nm||1410 nm|
|SFP-CWDM3G-8||1430 nm||1450 nm|
|Receiver Frequency Supported|
|SFP-3G-DRX||1270 > 1610 Dual Receiver|