• Wikipedia → Gigabit Ethernet
• Wikipedia → 10 Gigabit Ethernet
• Wikipedia → SFP Transceiver
• Wikipedia → DWDM / CWDM = Dense/Coarse Wavelength Division Multiplexing

CWDM in a picture:

• Simple mux/demux in stand-alone model: Sigma SML-50-8180
• http://www.fo4all.com/cwdmmuxdemux.html
• ITU-T G.694.2 CWDM grid using 20 nm wide channel spacing and implemented using only the higher part of the standard wavelength range (1470 through 1610 nm)

<table width="100%">
<tbody>
<tr>
<td align="center" bgcolor="GRAY">1470</td>
<td align="center" bgcolor="VIOLET">1490</td>
<td align="center" bgcolor="BLUE">1510</td>
<td align="center" bgcolor="GREEN">1530</td>
<td align="center" bgcolor="YELLOW">1550</td>
<td align="center" bgcolor="ORANGE">1570</td>
<td align="center" bgcolor="RED">1590</td>
<td align="center" bgcolor="BROWN">1610</td>
</tr>
</tbody>
</table>

• Cisco SFP Optics For Gigabit Ethernet Applications
• Cisco CWDM GBIC and SFP Solution

• Lightem CWDM Optical Transceivers
• Lightem SFP Optical Transceivers

Type SFP:                       : Lightem CWS125SXX22D
Spec                            : Gigabit Ethernet 1.25G SFP CWDM 1270-1610nm
Output Power                    : -2..+3 dBm
Sensivitiy                      :    -24 dBm
Saturation                      :     -7 dBm
Distance (?)                    :     22 dB
Min. fiber loss @ -2 dBm Output :      5 dB
Min. fiber loss @ +3 dBm Output :     10 dB

Type SFP:                       : Lightem LCWS125SXX32D
Spec                            : Gigabit Ethernet 1.25G SFP CWDM 1270-1610nm 
Output Power                    : -2..+3 dBm
Sensivitiy                      :    -32 dBm
Saturation                      :     -7 dBm
Distance (?)                    :     32 dB
Min. fiber loss @ -2 dBm Output :      5 dB
Min. fiber loss @ +3 dBm Output :     10 dB

[min fiber loss] = [max output-power] - [min saturation]

• http://www.huihongfiber.com/cisco-glc-zx-sm.html
• http://www.moduletek.com/en/products1.aspx?TypeId=10&ClassId=41
• http://www.sfplustransceiver.com/cisco-glc-zx-sm?keyword=1000base-zx&category_id=39
• http://www.laser2000.nl/
• http://www.laser2000.co.uk/installers_h.php?area=transceivers&sort=descs&ad=asc
• http://www.laser2000.co.uk/fibre_optics_h.php?area=169&sub=259&suba=375

Compatible:

• Skylane SFP85P55GE00100

Not compatible:

• Finisar FTRJ-8519-7D
• WTD RTXM191-551
• Picolight PL-XPL-VC-S13-11
• Fiberxon FTM-8012C-L

• 10 Gigabit Ethernet
• 10GBase-CU (twinax bekabeling 10m) (“SFP+ Direct Attach”)
• 10GBase-CX4 (twinax bekabeling, 15m)
• 10GBase-T (UTP 100m)
• Cisco SFP-10G-kabel (SFP-kabel-SFP) 10GBASE-CU SFP+ Cable 3 Meter

G.657.A is fully compliant with G.652, G.657.B is not necessarily 
compliant with G.652 but is capable of low values of macrobending 
losses at very low bend radii and is pre-dominantly intended for 
in-building use.

• TKF DAC 2X SM G.657A kabel

Direct Access Cable (DAC) = Lichtgewicht metaalvrije 'direct-buried' Access 
glasvezelkabel waarvan alle vezels in één buisje zijn aangebracht.

Cisco article

• http://www.ciscopress.com/articles/article.asp?p=170740&seqNum=7

• info on: http://www.huihongfiber.com/pc-upc-apc.html

PC, UPC, APC are short for:
- Physical Contact (PC)
- Ultra Physical Contact (UPC)
- Angled Physical Contact (APC)
They are actually the polish style of fiber optic ferrules.

Orientation duplex connector:

• when looking into front of sfp, with notch upwards:
  • left = transmit
  • right = receive
• NOTE: it is marked on the SFP with small arrows!

• Fiber Connectors are available in two version (polishing of the tip):
  • PC = Polished Contact (standard, color=blue)
  • APC = Angle-Polished Contact (available in 8 and 9 degrees, 8 is more common, color=green)
• APC is only available for Singlemode fiber (SMF). for Multimode-Fiber (MMF) the tip is always PC (color=beige).
• APC is used in long-distance SMF networks to reduce reflections
• Background: http://www.infocellar.com/networks/fiber-optics/fiber-polishing.htm

Picture of SC-APC and LC-PC connector:

Fiber Coupler SC-SC
Fiber Coupler SC-ST

• FOA → http://www.foanederland.com/details.aspx?CID=44

• FOA → http://www.foanederland.com/details.aspx?CID=39
• https://www.netwerkwinkel.com/Glasvezel-patchkabels-s_58.html

• Tyco-AMP whitepaper → Fiber Polarity Simplified

Polarity of SFP:

Note the arrows on the SFP-module:

Polarity of SFP-to-SFP link:

Polarity of Panel-to-Panel link:

• Central Point → MicroConnect Attenuator LC/PC SM with 10dB
• EET → MicroConnect Attenuator LC/PC SM with 10dB
• FOA attenuators → http://www.foanederland.com/details.aspx?CID=45

• http://www.gaofiberoptics.com/sfpgez_cisco_compatible-p-999.html

When shorter distances of single-mode fiber are used, it may be 
necessary to insert an inline optical attenuator in the link to 
avoid overloading the receiver. A 10-dB inline optical attenuator 
should be inserted between the fiber-optic cable plant and the 
receiving port on the SFP at each end of the link whenever the 
fiber-optic cable span loss is less than 8 dB.

Smart Optics T-3016:

• http://smartoptics.biz/products/passive-wdm/cwdm/
• Smart Optics T-3016
• GDS heeft T-3009