Multi-wavelength optical transmitting and receiving modules

A multi-wavelength optical transmitting module comprising:

• a housing having a first coupling hole and a second coupling hole respectively formed in opposite surfaces thereof;
• an optical output block coupled to the first coupling hole of the housing, connected to an optical signal connector, and comprising a first lens;
• an optical transmitting block coupled to the second coupling hole of the housing, connected to an electrical signal connector, and comprising a plurality of transmitting devices which respectively output light having different wavelengths and are arranged parallel to the optical output block, and a plurality of second lenses which are arranged on a light output side of the transmitting devices to correspond respectively to the transmitting devices;
• and
• an optical multiplexer (MUX) block disposed within the housing, multiplexing optical signals of multiple wavelengths, which were output from the transmitting devices and pass through the second lenses, and transmitting the multiplexed optical signals to the optical output block;
• wherein the optical output block and the optical transmitting block are coupled to the housing such that the first lens faces an outermost one of the transmitting devices, and the optical MUX block comprises:
• a transparent body having a first inclined surface, which faces the optical output block and one end thereof is closer to the first lens than the other end, and having a second inclined surface which faces the optical transmitting block and is parallel to the first inclined surface;
• an anti-reflecting layer formed in a region of the first inclined surface, which corresponds to the first lens, and is formed in the entire region of the second inclined surface;
• a totally reflecting layer formed in the other regions of the first inclined surface;
• and
• thin-film filters, each receiving optical signals of multiple wavelengths from the transmitting devices, allowing an optical signal having a corresponding wavelength to pass therethrough, and reflecting optical signals having the other wavelengths.