Questions tagged [optics]

For questions relating to fiber-optic connectors and transceivers.

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2
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1answer
35 views

What is the difference between LR1 and LR4 optics?

Does anyone know what's the difference between LR1 and LR4 optics?
0
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1answer
29 views

Why do higher speed links require a stronger signal?

I understand that higher-speed optical links require a stronger signal. For example, 16 Gbps Fibre Channel transceivers have to transmit at -1.3 dBm and receive at -10.3 dBm. If it falls below that, ...
2
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0answers
63 views

10G Interface on Juniper MX Stops Transmitting Output Optical Power

We have been facing an issue on Juniper MX series router. We have 10G interface on our router. Its does not matter whether interface is connected to DWDM or interface itself is a dark fiber. The end ...
2
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1answer
36 views

Is configuring FEC mandatory in designing 100G networks? What's the difference FEC makes with DACs vs optics?

I have read a lot of information online but I am still not sure when do we exactly configure FEC and what are the advantages/disadvantages of configuring it. Does DAC transceivers always need FEC to ...
1
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1answer
30 views

Using XFP-10G (120 KM Range) on Juniper MX routers

Hi everyone, We recently installed a new 10G XFP optics module in Juniper MX router. As per the customer , XFP supported range is 120 KM and it is from some third party vendor named 'menara'. Menara ...
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2answers
56 views

Is there a way to know the length of the cable used between the connected SFPs on a switching/routing device?

I have connected two Juniper routers with a QSFP28 optics and I need to find out the length of the optical cable I have used. Is there a command to check that in the router?
1
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1answer
94 views

How does “bits per second” relate to wavelength?

I'm learning about optical networking at a new job, and am confused by some introductory terminology. I'm pondering this statement: There is typically one transponder for every client signal and SFP ...
0
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0answers
11 views

Optical RX/TX only link [duplicate]

If I connect on one side only TX (RX stays empty in the optical LC Transceiver) and on the other only RX (empty TX) will the link come up ? Both sides are ports on a switch. I assume the RX side comes ...
2
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1answer
401 views

10G SFP+ transceiver with OM4 fiber cable - Maximum cable length?

I can't find 10Gb SFP+ transceivers supporting cable length over 300mt (we need 400/500mt) is there a standard/physical limit on this, or such transceivers, with extended length support, do exist? We'...
2
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3answers
577 views

SFP-10G-LRM compatible with Single Mode Fiber?

I just started working with new company and found they are using SFP-10G-LRM with single mode fiber. How could this be? I thought since the SFP-10G-LRM is Multimode, it can't work with single mode ...
0
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1answer
47 views

Macsec and Optics

Do Macsec have any bearing with respect to optics? Wanted to understand, if Macsec is enabled, will the optics perform any additional task or they are transparent and it doesn’t bother if Macsec is ...
3
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1answer
73 views

what is pump conversion efficiency?

I am reading an article about Optical Fiber amplifier and i saw the term pump conversion efficiency. Do you know what this mean ? I have seen on the internet that energy conversion efficiency is the ...
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2answers
40 views

Optical fibers out of service

We just got multiple new optical fibers out of service on our infrastructure, does a bad equipment or a too high signal could break an optical fiber silica or could cause any others issues ?
7
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2answers
907 views

Do low temperatures cause problems installing new optical wiring or fixing broken optical cables by splicing?

One of our supplier reported big problems splicing (using this) a broken outdoor optical fiber cable when temperatures around or little bellow freezing point. They refuse to install new optical fiber ...
1
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1answer
526 views

Latency of AOC vs passive DAC

Long time ago I heard from friend that on really short distance using optical links makes no much sense because comparing to passive connection optical interfaces introduce another layer of hardware ...
7
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2answers
577 views

What certifications are there for Fiber Optic termination and splicing?

As a knowledgeable person in computer networks I have always had an itch for learning how to create custom-length fiber optic cables. So, as a personal goal, I want to get trained and certified in ...
1
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1answer
58 views

Can one optical fibre transmit multiple networks

Can a single optic fibre installation transmit multiple connections, For example, There are two networks, each network sends and receives data to or from. My question is can both the two networks be ...
1
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1answer
63 views

What is the purpose of defect limit in Zone D in criteria for MM‐PC Connectors (IEC 61300‐3‐35)

Zones in IEC 61300‐3‐35 are defined as shown on this picture. However the optical signal is transmitted by the Zone A - Core. Light is transmitted and retained in the “CORE” of the optical fiber ...
1
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1answer
219 views

Power at the terminals of a PLC fiber optic splitter

I have a 1xN PLC fiber optic splitter which works like this: The optical power of the incoming signal is P; the power in each outgoing cable is P/N. I want to use the splitter as a combiner. If the ...
1
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2answers
100 views

Need an estimate of the max power density

Here is an image of a 1x64 fiber optic splitter/combiner: I am assuming these are plastic/polymer fibers. A very similar box (http://www.ebay.co.uk/itm/SC-UPC-1x32-Fiber-Optic-Splitter-PLC-Splitter-...
2
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2answers
117 views

detect SFP transmit wavelength

Let's say there is a no-name SFP transceiver without a label and without DDM support. Is there a device which is able to detect on what wavelength this SFP transmits? I have used JDSU light-meters ...
6
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6answers
4k views

SFP+ transceiver's ability to do 1GbE

I understand that most ports that support SFP+ transceivers can step down to allow an SFP to be plugged into it, but my question is around the transceivers/optics themselves. Can an SFP+ transceiver ...
2
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1answer
1k views

Cisco Digital Optical Monitoring Command

Can some tell me what for monitoring optical power on my 7200 series router . The interface has a SFP 1000BASE-LX. sh int gig0/0 transceiver ,doesnt give me the required information( Optical power in ...
1
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1answer
29 views

Power Budget Based on Miniums?

I'm currently looking at 40Gbase-LR and am curious about the advertised power budget. Here are the specifications: Transmit max 2.30dBm Transmit min -7.00dBm Receive max 2.30dBm Receive ...
1
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1answer
286 views

Doubt about MMF and SMF speed

I have a doubt about MMF and SMF cables. If MMF can handle more than one signal light at the same time and both MMF and SMF support full-duplex, why isn't MMF faster than SMF cable?
2
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1answer
67 views

How many 3 dB couplers are needed to construct a 16 way fiber optic splitter?

Wikipedia says we need 31 couplers. Can't we do it with 8 couplers?
6
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2answers
3k views

Is it possible to permanently damage optical transceiver if Rx signal is too strong?

Data sheets of optical transceivers often specify the receiver maximum input power. In addition, non-volatile memory of transceivers often seem to hold this data: root@MX240> show interfaces ...
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3answers
3k views

How to connect two networks via fiber optics (LC Connectors)

I have the following situation. There is a ethernet network on the 10th, we want to expand it to the 5th. We hired somebody, they setup the patchbox and the cables in the 5th to each office. They ...
2
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3answers
6k views

Can I use an OM3 fiber optics cable on 1gb transceiver J4858C?

I have this multimode transceiver product: http://www8.hp.com/h20195/v2/gethtml.aspx?docname=c04168409&search=J4858C I am going to use it on the following switch: http://www8.hp.com/h20195/v2/...
9
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4answers
32k views

How can I find what optic is in an interface for a Juniper MX-series router?

As the title states, how can I see what optic I have installed in an interface for an MX router?
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1answer
952 views

Using a G. 655 with a G. 652.D fiber cable?

Is it possible to use a G.652.D with a G.655 fiber for just a small distance (less than 10 m) for the interconnect only (from the patch panel to the switch) ? If yes or no, what will happen ? And for ...
3
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4answers
8k views

Difference between LR and ZR 10Gb Optics

What is the difference between a 10Gb LR optic that can only go 10km compared to a ZR optic that can go a lot further at 70km?
8
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3answers
644 views

cheaper 40gb optics/uplinks?

I'm pricing out a decent size 10gb network (6-8 ToR switchs) and the uplink costs are a major factor. I figure each ToR switch needs 4x40gb uplinks and you have a cost for the uplink optics that is ...