====== Fibre optical connections ======

===== DHD Gigabit Audio - GA =====
In general, all multi-mode fibre-optic cables can be used which are recommended for "IEEE 802.3 Gigabit Ethernet (1.25GBd), 1000BaseSX". 

These are the fibre-optic cable types OM3 and OM4. 

Cables with a core diameter of 50/125 μm and 65,5/125 μm can be used, but we recommend for cable length of more than 200 m a core diameter of 50/125 μm.

Use cables with LC connectors on both sides.
/*
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**Warning**\\  Extension of fibre-optic cables is only possible with DHD concentrators.
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 */

==== Multi-mode DHD GA Receiver/Transmitter for Core-to-Concentrator connections ====
**Data sheet abstract for [[https://dhd.audio/product/xsfplcmmf6c/|XSFPLCMMF6C]]:**
=== Transmitter Section ===
^Parameter^Symbol^Min^Typical^Max^Unit^Notes^
|Centre Wavelength|λc|830|850|860|nm|  |
|Spectral Width (RMS)|Δλ|  |  |0.85|nm|  |
|Average Ouput Power|Pout|-9.5|  |-3|dBm|((The optical power is launched into multi-mode fibre))|
|Extinction Ratio|ER|9|  |  |dB|  |

=== Receiver Section ===
^Parameter^Symbol^Min^Typical^Max^Unit^Notes^
|Centre Wavelength|λc|770|  |860|nm|  |
|Receiver Sensitivity|  |  |  |-18|dBm|((Measured with a PRBS 2<sup>7</sup>-1 test pattern @ 1250Mbps, BER ≤1x10<sup>-12</sup>))|
|Receiver Overload|  |-3|  |  |dBm|((Measured with a PRBS 2<sup>7</sup>-1 test pattern @ 1250Mbps, BER ≤1x10<sup>-12</sup>))|

==== Single-mode DHD GA Receiver/Transmitter for Core-to-Concentrator connections====

**Data sheet abstract for [[https://dhd.audio/product/xsfplcsmf6c/|XSFPLCSMF6C]].**
=== Transmitter section ===
^Parameter^Symbol^Min^Typical^Max^Unit^Notes^
|Centre Wavelength|λc|1260|1310|1360|nm|  |
|Spectral Width (RMS)|Δλ|  |  |4|nm|  |
|Average Ouput Power|Pout|-9|  |-3|dBm|((The optical power is launched into single-mode fibre))|
|Extinction Ratio|ER|9|  |  |dB|  |

=== Receiver section ===
^Parameter^Symbol^Min^Typical^Max^Unit^Notes^
|Centre Wavelength|λc|1260|  |1580|nm|  |
|Receiver Sensitivity|  |  |  |-23|dBm|((Measured with a PRBS 2<sup>7</sup>-1 test pattern @ 1250Mbps, BER ≤1x10<sup>-12</sup>))|
|Receiver Overload|  |-3|  |  |dBm|((Measured with a PRBS 2<sup>7</sup>-1 test pattern @ 1250Mbps, BER ≤1x10<sup>-12</sup>))|


==== Multi-mode DHD GA Receiver/Transmitter for Core-to-Core connections ====

**Data sheet abstract for [[https://dhd.audio/product/527391A/|52-7391A]]:**
=== Transmitter Section ===
^Parameter^Symbol^Min^Typical^Max^Unit^Notes^
|Centre Wavelength|λc|830|850|860|nm|  |
|Spectral Width (RMS)|Δλ|  |  |0.85|nm|  |
|Average Ouput Power|Pout|-9.5|-6.5|-3|dBm|((The optical power is launched into multi-mode fibre, 50/125 μm fibre with NA = 0.2, 62.5/125 μm fibre with NA = 0.275))|
|Extinction Ratio|ER|9|12|  |dB|  |

=== Receiver Section ===
^Parameter^Symbol^Min^Typical^Max^Unit^Notes^
|Centre Wavelength|λc|830|  |860|nm|  |
|Receiver Sensitivity|  |  |-21|-17|dBm|  |
|Receiver Overload|  |-13.5|  |  |dBm|  |


**Data sheet abstract for [[https://dhd.audio/product/527591A/|52-7591A]]:**
=== Transmitter Section ===
^Parameter^Symbol^Min^Typical^Max^Unit^Notes^
|Centre Wavelength|λc|830|850|860|nm|  |
|Spectral Width (RMS)|Δλ|  |  |0.85|nm|  |
|Average Ouput Power|Pout|-9.5|  |-3|dBm|((The optical power is launched into multi-mode fibre))|
|Extinction Ratio|ER|9|  |  |dB|  |

=== Receiver Section ===
^Parameter^Symbol^Min^Typical^Max^Unit^Notes^
|Centre Wavelength|λc|770|  |860|nm|  |
|Receiver Sensitivity|  |  |  |-18|dBm|((Measured with a PRBS 2<sup>7</sup>-1 test pattern @ 1250Mbps, BER ≤1x10<sup>-12</sup>))|
|Receiver Overload|  |-3|  |  |dBm|((Measured with a PRBS 2<sup>7</sup>-1 test pattern @ 1250Mbps, BER ≤1x10<sup>-12</sup>))|


==== Single-mode DHD GA Receiver/Transmitter for Core-to-Core connections ====

**Data sheet abstract for [[https://dhd.audio/product/527395A/|52-7395A]]:**
=== Transmitter section ===
^Parameter^Symbol^Min^Typical^Max^Unit^Notes^
|Centre Wavelength|λc|1270|1310|1355|nm|  |
|Average Output Power|Pout|-9.5|  |-3|dBm|((The optical power is launched into single-mode fibre))|
|Extinction Ratio|ER|9|  |  |dB|  |

=== Receiver section ===
^Parameter^Symbol^Min^Typical^Max^Unit^Notes^
|Centre Wavelength|λc|1270|1310|1355|nm|  |
|Receiver Sensitivity|  |  |  |-19|dBm|((BER = 10<sup>-12</sup>))((An average power of -20 dBm with an Extinction Ratio of 9 dB is approximately equivalent to an OMA of 15 μW))|
|Receiver Overload|  |-3|  |  |dBm|  |


**Data sheet abstract for [[https://dhd.audio/product/527592A/|52-7592A]]:**
=== Transmitter section ===
^Parameter^Symbol^Min^Typical^Max^Unit^Notes^
|Centre Wavelength|λc|1260|1310|1360|nm|  |
|Spectral Width (RMS)|Δλ|  |  |4|nm|  |
|Average Ouput Power|Pout|-9|  |-3|dBm|((The optical power is launched into single-mode fibre))|
|Extinction Ratio|ER|9|  |  |dB|  |

=== Receiver section ===
^Parameter^Symbol^Min^Typical^Max^Unit^Notes^
|Centre Wavelength|λc|1260|  |1580|nm|  |
|Receiver Sensitivity|  |  |  |-23|dBm|((Measured with a PRBS 2<sup>7</sup>-1 test pattern @ 1250Mbps, BER ≤1x10<sup>-12</sup>))|
|Receiver Overload|  |-3|  |  |dBm|((Measured with a PRBS 2<sup>7</sup>-1 test pattern @ 1250Mbps, BER ≤1x10<sup>-12</sup>))|

===== MADI =====
All the below mentioned fiber optical cables can be used for wiring DHD systems, depending on the MADI port type (multi mode or single mode). Please decide, which cable is the most suitable in your case or ask a network specialist for help if you are unsure about the cable type.


In cases when a structured building cabling system is used, the cable type may be already installed or decided before the studio installation begins. In this case you need to select the appropriate multi mode or single mode module.


As a rule of thumb you may use multi mode cables up to 500m and single mode cables up to 15km. DHD can not guarantee this values, because it is mainly dependent of the cable type, the quality of cable and connector installation and the number and quality of connectors and patches in between. Only a professional measurement of the optical power loss of the entire cable including all connectors and patches can proof the quality. Use this measurement result and the receiver/transmitter specifications below to calculate the remaining optical power budget.

The baud rate of a MADI signal is 125MBaud. To learn more about MADI please refer to "Serial Multichannel Audio Digital Interface (MADI) AES10-2003" published by Audio Engineering Society, Inc.

Fibre optic cables are supplied by several manufacturers, for example HITRONIC® fibre optic cables from the manufacturer Lapp Kabel. Please refer to the cable manufacturers data sheets for any technical details and specifications. The following fiber optical cables can be used to interconnect the MADI ports of DHD systems among each other and with third party devices.

==== Multi-mode cable types ====

^Fiber^Fiber Type^Core Diameter in μm^Cladding Diameter in μm^Typical Fiber Diameter in in μm^Typical Damping Coefficient in dB/km^Typical Bandwidth for 1 km in MHz^Typical Numerical Aperture^
|G 50/125 - OM2|multi mode graded index|50|125|250|≤ 0.9 at 1300nm|≥ 800 at 1300nm|0.2|
|G 50/125 - OM3|multi mode graded index|50|125|250|≤ 0.9 at 1300nm|≥ 500 at 1300nm|0.2|
|G 62.5/125 - OM2|multi mode graded index|62.5|125|250|≤ 1 at 1300nm|≥ 500 at 1300nm|0.27|

The OM3 fiber allows data rates up to 10 GB/s, the OM2 fiber is designed for networks with data rates up to 1 GB/s - both are sufficient for the operation of MADI devices with a much lower data rate of 125MBaud.

==== Single-mode cable types ====

^Fiber^Fiber Type^Core Diameter in μm^Cladding Diameter in μm^Typical Fiber Diameter in in μm^Typical Damping Coefficient in dB/km^
|E 9/125|mono mode / single mode graded index|9|125|250|≤ 0.36 at 1310nm|

==== Multi-Mode MADI Receiver/Transmitter ====

**Data sheet abstract for [[https://dhd.audio/product/527321A/|52-7321A]] and for [[https://dhd.audio/product/527593A/|52-7593A]]:**
=== Transmitter section ===
^Parameter^Symbol^Min^Typical^Max^Unit^Notes^
|Centre Wavelength|λc|1260|1310|1360|nm|  |
|Spectral Width (RMS)|Δλ|  |  |10|nm|  |
|Average Ouput Power|Pout|-19|  |-12|dBm|((The optical power is launched into single-mode fibre))|
|Extinction Ratio|ER|8.2|  |  |dB|  |

=== Receiver section ===
^Parameter^Symbol^Min^Typical^Max^Unit^Notes^
|Centre Wavelength|λc|1260|  |1600|nm|  |
|Receiver Sensitivity|  |  |  |-30|dBm|((Minimum sensitivity and saturation levels at BER 1E-10 for a 2<sup>7</sup>-1 PRBS.))|
|Receiver Overload|  |-8|  |  |dBm|  |

==== Single-mode MADI Receiver/Transmitter ====

**Data sheet abstract for [[https://dhd.audio/product/527325B/|52-7325B]] and for [[https://dhd.audio/product/527594A/|52-7594A]]:**
=== Transmitter section ===
^Parameter^Symbol^Min^Typical^Max^Unit^Notes^
|Centre Wavelength|λc|1260|1310|1360|nm|  |
|Spectral Width (RMS)|Δλ|  |  |4|nm|  |
|Average Ouput Power|Pout|-14|  |-8|dBm|((The optical power is launched into single-mode fibre))|
|Extinction Ratio|ER|9|  |  |dB|  |

=== Receiver section ===
^Parameter^Symbol^Min^Typical^Max^Unit^Notes^
|Centre Wavelength|λc|1260|  |1580|nm|  |
|Receiver Sensitivity|  |  |  |-32|dBm|((Measured with a PRBS2<sup>23</sup>-1 test pattern @ 155Mbps, BER ≤1x10<sup>-10</sup>))|
|Receiver Overload|  |-3|  |  |dBm|((Measured with a PRBS2<sup>23</sup>-1 test pattern @ 155Mbps, BER ≤1x10<sup>-10</sup>))|