Transceivers that change the way you compete


CWDM-SFPEoptolink CWDM SFP+  transceiver is small form factor pluggable module for bi-directional serial optical data communications such as IEEE 802.3ae 10GBASE-LR/LW/ER/ZR. It is with the SFP 20-pin connector to allow hot plug capability. Digital diagnostic functions are available via an I2C. This module is designed for single mode fiber and operates at a nominal wavelength of CWDM wavelength. There are 18 center wavelengths available from 1270 nm to 1610 nm, with each step 20 nm. A guaranteed minimum optical link budget of 14 dB is offered. The transmitter section uses a CWDM multiple quantum well DFB/EML laser and is a class 1 laser compliant according to International Safety Standard IEC-60825. The receiver section uses an integrated InGaAs detector preamplifier (IDP) mounted in an optical header and a limiting post-amplifier IC.


BIDI CWDM SFPBIDI CWDM SFP+ special CWDM SFP+, TX and RX with the same wavelength. It comes with pigtail LC/APC or SC/APC coming out from the transceiver port. AT present available waves 1270-1330, if you need other waves, please, contact with us.



  • Up to 11.1 Gb/s Bi-directional Data Links
  • Can be used with single fiber CWDM system or dual fiber CWDM system
  • 10Gb / 11.3G Ethernet
  • 2G/4G/8G/10G Fibre Channel compliance
  • Complaint to SFP+ MSA
  • Compliant to IEEE 802.3ae 10GBASE
  • Maximum Link Length of 80 km at 10.3125Gb/s
  • Uncooled 18-λ CWDM DFB/cooled EML LD: from 1270 nm to 1610 nm
  • Power Budget up to 10dB, 14dB, 16dB, 23 dB
  • SFF-8472 Digital Diagnostic Function
  • AC/AC Coupling according to MSA
  • Single +3.3 V Power Supply
  • RoHS 6/6 Compliant
  • Class 1 Laser International Safety Standard IEC-60825 Compliant


  • Metro Access Rings and Point-to-Point networking for Gigabit Ethernet and Fibre Channel



Part No. Fiber Type Data Rate Range Wavelength Optical Comp. Distance Range Case Temperature range
EOLP-BI1696-S-9XPL SMF 9.95~11.1G 1270~1330nm DFB/PIN 9dB 0~70
EOLP-1696-10X SMF 9.95~11.1G 1270~1330nm DFB/PIN 10dB 0~70
EOLP-1696-14X SMF 9.95~11.1G 1270~1450nm DFB/PIN 14dB 0~70
EOLP-1696-23X SMF 9.95~11.1G 1270~1450nm DFB/APD 23dB 0~70
EOLP-1696-10X SMF 9.95~11.1G 1350~1610nm DFB/PIN 10dB 0~70
EOLP-1696-14XN SMF 9.95~11.1G 1470~1610nm EML/PIN 14dB 0~70
EOLP-1696-14XIN SMF 9.95~11.1G 1470-1610nm EML/PIN 14ddB -40~85
EOLP-1696-23XN SMF 9.95~11.1G 1470~1610nm EML/APD 23dB 0~70
EOLP-1696-23XIN SMF 9.95~11.1G 1470-1610nm EML/APD 23dB -40~85

For CWDM 8G FC and CPRI OBSAI SFP please visit this page



EOLP-1696-14XR SMF 9.95~11.1G 1270~1450nm DFB/PIN 14dB 0~70
EOLP-1696-14XR SMF 9.95~11.1G 1470~1610nm EML/PIN 14dB 0~70
EOLP-1696-23XR SMF 9.95~11.1G 1470~1610nm EML/APD 23dB 0~70


For CWDM 8G FC and CPRI OBSAI SFP please visit this page


Originally, the term "coarse wavelength division multiplexing" was fairly generic,  and meant a number of different things. In general, these things shared the fact that the choice of channel spacings and frequency stability was such that erbium doped fiber amplifiers (EDFAs) could not be utilized. Prior to the relatively recent ITU standardization of the term, one common meaning for coarse WDM meant two (or possibly more) signals multiplexed onto a single fiber, where one signal was in the 1550 nm band, and the other in the 1310 nm band.

In 2002 the ITU standardized a channel spacing grid for use with CWDM
(ITU-T G.694.2), using the wavelengths from 1270 nm through 1610 nm with a channel spacing of 20 nm. (G.694.2 was revised in 2003 to shift the actual channel centers by 1 nm, so that strictly speaking the center wavelengths are 1271 to 1611 nm).[1] Many CWDM wavelengths below 1470 nm are considered "unusable" on older G.652 (dotten line) specification fibers, due to the increased attenuation in the 1270–1470 nm bands. Newer fibers which conform to the G.652.C and G.652.D (full line) standards, such as Corning SMF-28e and Samsung Widepass nearly eliminate the "water peak" attenuation peak and allow for full operation of all 18 ITU CWDM channels in metropolitan networks.


CWDM wave grid

Band Nomenclature Wavelength(nm)
Min. Typ. Max.
O-band Original A 1264 1270 1277.5
B 1284 1290 1297.5
C 1304 1310 1317.5
D 1324 1330 1337.5
E 1344 1350 1357.5
E-band Extended F 1364 1370 1377.5
G 1384 1390 1397.5
H 1404 1410 1417.5
I 1424 1430 1437.5
J 1444 1450 1457.5
S-band Short Wavelength K 1464 1470 1477.5
L 1484 1490 1497.5
M 1504 1510 1517.5
N 1524 1530 1537.5
C-band Conventional O 1544 1550 1557.5
L-bandLong Wavelength  P 1564 1570 1577.5
Q 1584 1590 1597.5
R 1604 1610 1617.5

WDM white paper:
DWDM white paper:
CWDM white paper:
CWDM DWDM Integration:
DWDM EDFA white paper:
Dispersion white paper:
TDM white paper:

Optical Budget

Attenuation in 652D fiber vs CWDM wavelenght


Talking about CWDM modules, it's more correct to talk about optical budget rather then distance talking into account that IL per different CWDM wavelength is different in fiber.

he optical power budget in a fiber-optic communication link is the allocation of available optical power (launched into a given fiber by a given source) among various loss-producing mechanisms such as launch coupling loss, fiber attenuation, splice losses, and connector losses, in order to ensure that adequate signal strength (optical power) is available at the receiver. In optical power budget attenuation is specified in decibels (dB) and optical power in dBms.

The amount of optical power launched into a given fiber by a given transmitter depends on the nature of its active optical source (LED or laser diode) and the type of fiber, including such parameters as core diameter and numerical aperture. Manufacturers sometimes specify an optical power budget only for a fiber that is optimum for their equipment—or specify only that their equipment will operate over a given distance, without mentioning the fiber characteristics. The user must first ascertain, from the manufacturer or by testing, the transmission losses for the type of fiber to be used, and the required signal strength for a given level of performance.

In addition to transmission loss, including those of any splices and connectors, allowance should be made for at least several dB of optical power margin losses, to compensate for component aging and to allow for future splices in the event of a severed cable.

    LT = αL + Lc + Ls


    LT - Total loss
    α - Fiber attenuation
    L - Length of fiber
    Lc - Connector loss
    Ls - Splice loss