Planar lightwave circuit type optical transceiver module
View Patent ↗Provided is a planar lightwave circuit (PLC) type optical transceiver module, in which for a diplex optical transceiver module that uses different wavelengths in upstream and downstream, an optical waveguide connected to a light-receiving unit is a multi-mode waveguide and an optical waveguide connected to the light-emitting unit is a single mode waveguide, and further, for a triplex optical transceiver module that uses one upstream wavelength and more than two different downstream wavelengths, an optical waveguide connected to the light-receiving unit, which is a waveguide-type photo diode, is a multi-mode waveguide and an optical waveguide connected to the light-emitting unit is a single mode waveguide, whereby even when there is an alignment error of a thin film filter due to irregularity provided in forming a trench, the optical waveguide connected to the light-receiving unit is formed wider than the optical waveguide connected to the light-emitting unit so that the loss during transmission of the optical signal to the light-receiving unit is minimized.
1. A planar lightwave circuit type optical transceiver module comprising:
a substrate;
a light-emitting unit and a light-receiving unit arranged on the substrate;
a single mode first optical waveguide having a core and a clad, and formed on the substrate to face the light-emitting unit;
a multimode second optical waveguide having a core and a clad, and formed on the substrate to face the light-receiving unit; and
a filter located at a portion at which the first optical waveguide and the second optical waveguide join with a gap without a direct contact between them, for transmitting or reflecting an optical signal according to a wavelength,
wherein the second optical waveguide has a larger core height than that of the first optical waveguide, and
wherein the light-receiving unit is a waveguide-type photo diode.
2. The planar lightwave circuit type optical transceiver module according to claim 1 , wherein the second optical waveguide has a larger core width than that of the first optical waveguide.
3. The planar lightwave circuit type optical transceiver module according to claim 1 , wherein the gap of 3 to 10 μm is located between the first optical waveguide and the second optical waveguide.
4. The planar lightwave circuit type optical transceiver module according to claim 1 , wherein the filter is inserted into a trench formed on the substrate.
5. The planar lightwave circuit type optical transceiver module according to claim 4 , wherein the trench is formed to have a depth of 100 to 300 μm and a width of 10 to 40 μm.
6. A planar lightwave circuit type optical transceiver module comprising:
a substrate;
a light-emitting unit arranged on the substrate;
a plurality of light-receiving units arranged on the substrate;
a single mode first optical waveguide having a core and a clad, and formed on the substrate to face the light-emitting unit;
a plurality of multimode second optical waveguides, each having a core and a clad, and formed on the substrate to face the plurality of light-receiving units; and
a plurality of filters, each filter located at a portion at which the first optical waveguide and the second optical waveguide are joined with a gap without a direct contact between them, for transmitting or reflecting an optical signal according to a wavelength,
wherein the second optical waveguide has a larger core height than that of the first optical waveguide, and
wherein the light-receiving unit is a waveguide-type photo diode.
7. The planar lightwave circuit type optical transceiver module according to claim 6 , wherein the light-emitting unit emits an optical signal in a wavelength range of 1260 to 1360 nm, and wherein the plurality of light-receiving units receive optical signals in a wavelength range of 1550 to 1560 nm and 1480 to 1500 nm.
8. The planar lightwave circuit type optical transceiver module according to claim 6 , wherein the plurality of light-receiving units are arranged to maintain an angle of 30 to 90 degrees with respect to the light-emitting unit.
9. The planar lightwave circuit type optical transceiver module according to claim 6 , wherein the second optical waveguide has a larger core width than that of the first optical waveguide.
10. The planar lightwave circuit type optical transceiver module according to claim 6 , wherein the second optical waveguide has a larger core thickness than that of the first optical waveguide.
11. The planar lightwave circuit type optical transceiver module according to claim 6 , wherein the gap formed between the first optical waveguide and the second optical waveguide is in the range of 3 to 10 μm.
12. The planar lightwave circuit type optical transceiver module according to claim 6 , wherein the filter is inserted into a trench formed on the substrate.
13. The planar lightwave circuit type optical transceiver module according to claim 12 , wherein the trench is formed to have a depth of 100 to 300 μm and a width of 10 to 40 μm.