NTT (Nippon Telegraph and Telephone) Patente

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An optical communication system includes: a first optical multiplexing/demultiplexing unit that splits and outputs uplink control signal light and main signal light transmitted at different wavelengths from one or more newly connected subscriber devices; a subscriber device management control unit that transmits downlink control signal light to the one or more newly connected subscriber devices in response to the split uplink control signal light; an optical distribution unit that includes a plurality of first ports and a plurality of second ports, receives, via any one of the plurality of first ports, input of the main signal light transmitted from the one or more newly connected subscriber devices in response to the downlink control signal light and then split, and outputs the main signal light from any one of the plurality of second ports; a detection unit that detects the main signal light input to the first port; and an optical distribution control unit that controls connection between the ports of the optical distribution unit so as to connect the first port at which the main signal light has been detected and any one of the plurality of second ports to which a subscriber device serving as a communication counterpart of the one or more newly connected subscriber devices is connected.

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A reference frequency necessary for meeting a standard for hold-over is supplied to a time reference device (ePRTC) at a remote location via an optical network 30. It is not necessary to prepare a plurality of high-precision frequency reference devices or the like that generates the reference frequency for each place of the time reference device. In a transmission side node N1, an optical frequency comb 12 generates an optical signal SG2 converted into a communication wavelength band while suppressing deterioration in frequency precision by being synchronized with a signal SG1 of the reference frequency, and the optical signal SG2 is transmitted to the optical network 30 via an optical frequency repeater 13. In a reception side node N2, an optical signal SG4 received from the optical network 30 is passed via an optical frequency repeater 16 and input into an optical frequency comb 17, and a frequency signal synchronized with the received signal is generated. A time reference device 18 performs a time hold-over with precision within the standard by using the frequency of a signal SG6 output from the optical frequency comb 17. The optical frequency repeaters 13 and 16 eliminate influence of fiber noise.

Provided are an optical module capable of suppressing oscillation of a high-frequency characteristic and stably operating, and a method for manufacturing the optical module. The optical module according to the present disclosure includes: one of a driver IC chip and a modulator chip, or a TIA chip and a receiver chip, integrated in the same package having an RF terrace connected with an RF interface; a plurality of wires that connect the driver IC chip with the modulator chip, or the TIA chip with the receiver chip, and the driver IC chip with the RF terrace, or the TIA chip with the RF terrace, and are installed for each connection portion; and a lid serving as a cap portion disposed at a position facing the driver IC chip and the modulator chip, or the TIA chip and the receiver chip, and a distance in a vertical direction from a surface of the driver IC chip or a surface of the TIA chip to a surface of the lid is less than 1/2 times a wavelength corresponding to an atmosphere in the package at a frequency of 0.7 times an operation baud rate.

To present a configuration of a smooth high-frequency connection between a DSP and an optical module in an optical transceiver and to provide an optical transceiver capable of operating at an ultra-high speed. An optical transceiver according to the present disclosure includes: at least one optical module that is mounted on a PCB; a DSP that is mounted on the PCB; an FPC that connects the DSP and the optical module or the PCB and the optical module; and a differential high-frequency line that is configured such that a p-side line and an n-side line form a differential pair, and is formed such that a signal propagates inside a DSP substrate of the DSP, inside the optical module, and between the DSP and the optical module, wherein the differential high-frequency line disposed between the DSP and the optical module has at least one first bent portion.

An optical transceiver is disclosed that implements smooth high frequency connection between a DSP and an optical module. The optical module may include an optical receiver module and an optical modulator module. The optical transceiver may include a single optical module in which functions of both the optical receiver and the optical modulator are integrated. The high frequency connection is implemented by a flexible circuit board (FPC), and the FPC electrically connects between a PAD on the upper surface of a DSP circuit board and a PAD of a package of the optical module. A connection PAD on one surface of the FPC is connected to the DSP circuit board side, and a connection PAD on the other surface is connected to the optical module side. A DSP chip may be mounted on the DSP circuit board, and the entire DSP may be covered with a lid except for a region of the DSP circuit board connected to the FPC.

An optical transceiver is disclosed that implements smooth high frequency connection between a DSP and an optical module. The optical module may include an optical receiver module and an optical modulator module. The optical transceiver may include a single optical module in which functions of both the optical receiver and the optical modulator are integrated. The high frequency connection is implemented by a flexible circuit board (FPC), and the FPC electrically connects between a PAD on the upper surface of a DSP circuit board and a PAD of a package of the optical module. A connection PAD on one surface of the FPC is connected to the DSP circuit board side, and a connection PAD on the other surface is connected to the optical module side. A DSP chip may be mounted on the DSP circuit board, and the entire DSP may be covered with a lid except for a region of the DSP circuit board connected to the FPC.

One aspect of the present invention provides an optical reception device including a monitoring unit configured to: optimize a polarization state by rotating each of a reference signal received in such a way as to be close to a reception signal and the reception signal; compute a power profile for each polarization for the signal with the optimized polarization state; and compute a power difference between the polarizations from the power profile for each polarization, and identify an occurrence position and a value of a polarization-dependent impairment from an occurrence position and a difference amount of the computed difference.

Provided are a configuration for achieving an optical transceiver capable of operating at an ultra-high speed, and a manufacturing method and a manufacturing device for the same. An optical transceiver according to the present disclosure includes at least one optical module mounted on a PCB, a DSP, and an FPC that connects the DSP and the optical module, wherein the FPC further includes a first connection PAD on a first surface solder-connected to a PAD on a terrace surface of the optical module, a second connection PAD on a second surface solder-connected to a PAD on an upper surface of a DSP substrate, both side surfaces, and the first connection PAD, the FPC and the first connection PAD and the FPC and the second connection PAD are connected by one or more through-holes or buried VIAs, and the through-hole has a diameter of ϕ100 µm or more.

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