Receiver optical module implementing optical attenuator

A receiver optical module comprising:

• a coupling unit that receives an optical fiber providing a wavelength multiplexed signal multiplexing optical signals each having a wavelength specific thereto and different from each other;
• an optical de-multiplexer that optically couples with the optical fiber and de-multiplexes the wavelength multiplexed signal provided from the optical fiber, the optical de-multiplexer providing a plurality of multi-layered dielectric films each passing one of the respective optical signals but reflecting other of the optical signals, the multi-layered dielectric films having a rectangular plane shape with a longer side and a shorter side;
• an optical attenuator provided between the coupling unit and the optical de-multiplexer, the optical attenuator attenuating the wavelength multiplexed signal and having a shutter movable along the longer side of the multi-layered dielectric film, and
• a wiring substrate and a housing,
• wherein the shutter in the optical attenuator partially overlaps with the wavelength multiplexed signal,
• wherein the wiring substrate provides interconnections that carry electrical signals for controlling the overlapping between the shutter and the wavelength multiplexed signal, and
• wherein the housing includes a front wall and a rear wall, the front wall providing the coupling unit, the rear wall providing a feedthrough including terminals that provides the electrical signals to the wiring substrate.

A receiver optical module comprising:

• a coupling unit that receives an optical fiber providing a wavelength multiplexed signal multiplexing optical signals each having a wavelength specific thereto and different from each other;
• an optical de-multiplexer that optically couples with the optical fiber and de-multiplexes the wavelength multiplexed signal provided from the optical fiber, the optical de-multiplexer providing a plurality of multi-layered dielectric films each passing one of the respective optical signals but reflecting other of the optical signals, the multi-layered dielectric films having a rectangular plane shape with a longer side and a shorter side;
• an optical attenuator provided between the coupling unit and the optical de-multiplexer, the optical attenuator attenuating the wavelength multiplexed signal and having a shutter movable along the longer side of the multi-layered dielectric film, and
• a carrier, a support, two wiring substrates and a housing,
• wherein the shutter in the optical attenuator partially overlaps with the wavelength multiplexed signal,
• wherein the wiring substrates provide interconnections that carry electrical signals for controlling the overlapping between the shutter and the wavelength multiplexed signal, and
• wherein the carrier mounts the optical de-multiplexer and the wiring substrate thereon, and the support supports the carrier and mounts the optical attenuator thereon.