Passive optical network dual system module
A passive optical network dual system module includes a light guide unit, an optical path conversion unit and an optical transceiver unit. The light guiding unit is connected to the optical fiber and is suitable for transmitting optical signals. The optical path conversion unit is connected to the light guide unit, and is suitable for receiving optical signals and changing the optical path of the optical signals. It is used in the optical transceiver unit for the configuration of two receiving parts and two transmitting parts, which can support the same optical path at the same time with use of two sets of communication protocol systems.
1 . A passive optical network dual system module, comprising:
a light guiding unit connected to an optical fiber and adapted to transmit an optical signal, and the optical signal is not a single wavelength;
an optical path conversion unit, connected to the light guide unit, adapted to receive the optical signal and change the optical path of the optical signal, the light path conversion unit sequentially includes along a direction toward the light guide unit a first collimating lens, a first filter, a second filter, a second collimating lens, a third filter and a fourth filter, wherein the first collimating lens and the second collimating lens are causing the optical signal to form parallel light; and
an optical transceiver unit, suitable for receiving and transmitting the optical signal, suitable for two sets of communication protocol systems, the optical transceiver unit includes:
a first receiving element, which is set corresponding to the first filter;
a second receiving element, which is set corresponding to the second filter;
a third emitting element, set corresponding to the third filter; and
a fourth emitting element, which is set corresponding to the fourth filter;
wherein, the first receiving element and the second receiving element are respectively disposed corresponding to one of the third emitting element and the fourth emitting element;
wherein when the optical signal is transmitted to the third filter, the incident angle of the optical signal entering the third filter is 20 to 30 degrees; and
wherein when the optical signal is transmitted to the fourth filter, the incident angle of the optical signal entering the fourth filter is 15 to 25 degrees.
2 . The passive optical network dual system module according to claim 1 , wherein when the optical signal is transmitted to the first filter, the incident angle of the optical signal entering the first filter is 45 degrees.
3 . The passive optical network dual system module according to claim 1 , wherein when the optical signal is transmitted to the second filter, the incident angle of the optical signal entering the second filter is 45 degrees.
4 . The passive optical network dual system module as claimed in claim 1 , wherein the first receiving element has a receiving wavelength range of 1575 to 1580 nm.
5 . The passive optical network dual system module according to claim 1 , wherein the second receiving element has a receiving wavelength range of 1480 to 1500 nm.
6 . The passive optical network dual system module as claimed in claim 1 , wherein the third emitting element emits a wavelength in the range of 1300 nm to 1320 nm.
7 . The passive optical network dual system module according to claim 1 , wherein the fourth emitting element has an emission wavelength range of 1260 nm to 1280 nm.
8 . The passive optical network dual system module according to claim 1 , wherein the difference in emission wavelength range between the third emitting element and the fourth emitting element is not greater than 60 nm.