I added a OLT device and Observium discovered ports, but I would need it to show us Optical parameter variations (temp, rx power, tx power, bias, volts, MAC, IP's) at PONs and Clients side. It is possible?.

I 'm attaching VSol MIB (but there are much others) and SNMP dump. 

GE ports are used for connection to core and PON's (8 or 16) are used to get clients by fiber.

Those PONs signal are splitted optically up to 128 clients and client side optical data is also saved on snmp variables (ONU's devices). 

1- OLT => device

2- PON => optical port on OLT

3- ONU => optical device on client (it has 1 optical port and 1 electrical port)

OLT name -> 1.3.6.1.4.1.37950.1.1.5.10.12.5.1

OLT temperature -> 1.3.6.1.4.1.37950.1.1.5.10.12.5.9

OLT cpuLoad -> 1.3.6.1.4.1.37950.1.1.5.10.12.3

OLT memoryLoad -> 1.3.6.1.4.1.37950.1.1.5.10.12.4

PON data in array

PON temperature -> 1.3.6.1.4.1.37950.1.1.5.10.13.1.1.2
PON volts -> 1.3.6.1.4.1.37950.1.1.5.10.13.1.1.3
PON bias -> 1.3.6.1.4.1.37950.1.1.5.10.13.1.1.4
PON txpwr -> 1.3.6.1.4.1.37950.1.1.5.10.13.1.1.5

ONU data in array

ONU temperature -> 1.3.6.1.4.1.37950.1.1.6.1.1.3.1.3
ONU volt -> 1.3.6.1.4.1.37950.1.1.6.1.1.3.1.4
ONU bias -> 1.3.6.1.4.1.37950.1.1.6.1.1.3.1.5
ONU txpwr -> 1.3.6.1.4.1.37950.1.1.6.1.1.3.1.6
ONU rxpwr -> 1.3.6.1.4.1.37950.1.1.6.1.1.3.1.7

ONU status -> 1.3.6.1.4.1.37950.1.1.6.1.1.1.1.5

distance OLT -> ONU 1.3.6.1.4.1.37950.1.1.6.1.1.12.1.3 

ONU model -> 1.3.6.1.4.1.37950.1.1.6.1.1.2.1.6

ONU Id -> 1.3.6.1.4.1.37950.1.1.6.1.1.2.1.5