Patent ID: 9391709
Filing Date: 2016-07-12
CPC Classification: G02B,H04B

Claim Text:
1. An optical transmitter module which outputs a multiplexed optical signal obtained by multiplexing four optical signals each having different wavelengths, comprising: a first light emitting element which emits a first optical signal; a second light emitting element which emits a second optical signal; a third light emitting element which emits a third optical signal; a fourth light emitting element which emits a fourth optical signal; a first wavelength selective filter and a second wavelength selective filter disposed on a light path of the first optical signal along a traveling direction of the first optical signal; a third wavelength selective filter disposed on a light path of the second optical signal; a reflection mirror disposed on light paths of the third optical signal and the fourth optical signal; and a lens from which a multiplexed optical signal obtained by multiplexing the first optical signal, the second optical signal, the third optical signal and the fourth optical signal is emitted, wherein the reflection mirror reflects the fourth optical signal to make the fourth optical signal enter the first wavelength selective filter and reflects the third optical signal to make the third optical signal enter the third wavelength selective filter, the third wavelength selective filter reflects the second optical signal to make the second optical signal enter the second wavelength selective filter and transmits the third optical signal reflected by the reflection mirror to make the third optical signal enter the second wavelength selective filter, the first wavelength selective filter transmits the first optical signal to make the first optical signal enter the second wavelength selective filter and reflects the fourth optical signal reflected by the reflection mirror to make the fourth optical signal enter the second wavelength selective filter, and the second wavelength selective filter transmits the first optical signal which has passed through the first wavelength selective filter and the fourth optical signal reflected by the first wavelength selective filter to make the first optical signal and the fourth optical signal enter the lens and reflects the second optical signal reflected by the third wavelength selective filter and the third optical signal which has passed through the third wavelength selective filter to make the second optical signal and the third optical signal enter the lens.