Optical transceiver outputting wavelength multiplexed signal and receiving another wavelength multiplexed signal

Patent metadata

Field	Value
Publication number	US-9768872-B2
Application number	US-201514940891-A
Country	US
Kind code	B2
Filing date	Nov 13, 2015
Priority date	Nov 20, 2014
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

An optical transceiver that provides a receiver optical module including a plurality photodiodes (PDs) each biased through internal bias lines, signal lines carrying driving signals to an optical transmitter module, and external bias lines each connected to the internal bias lines. One of the internal bias lines connected to one of the external bias lines arranged closest to the signal lines has a length shorter than lengths of the other internal bias lines so as not to affect EMI noises induced from the signal lines to the other internal bias lines.

First claim

We claim:

1. An optical transceiver that transmits a wavelength multiplexed optical signal and receives another wavelength multiplexed optical signal, the optical transceiver comprising:
an optical transmitter module configured to receive driving signals through signal lines, convert the driving signals into transmitting optical signals having respective wavelengths different from each other, and generate the wavelength multiplexed optical signal by multiplexing the transmitting optical signals depending on the wavelengths thereof;
an optical receiver module configured to de-multiplex the another wavelength multiplexed signal into receiving optical signals, and convert the receiving optical signals into receiving signals by photodiodes (PDs);
a bias supply configured to supply biases to respective PDs through external bias lines including first external bias line and other external bias lines, the first external bias line being arranged closest to the signal lines that carry the driving signals to the optical transmitter module,
wherein the optical receiver module includes a wiring substrate, terminals, and internal bias lines connected to the external bias lines through the terminals, the internal bias lines including bonding wires having substantially even lengths, first patterns, second patterns, third patterns, and filter units, the first and second patterns being provided on the wiring substrate, the first patterns being connected to the terminals through the bonding wires, the filter units being provided between the first patterns and the second patterns, the second pattern being connected to the PDs, the filter units including resistors and capacitors constituting RC filters, the resistors connected between the first patterns and the second patterns, the capacitors being providing between the second patterns and ground patterns provided on the wiring substrate, the PDs being mounted on the third patterns and connected to the second pattern through bonding wires, the filter units providing first capacitors and second capacitors, the first capacitors being mounted outside of the wiring substrate and connected to the second patterns through bonding wires, the second capacitors being mounted on the ground patterns on the wiring substrate and connected to the second patterns through bonding wires, and
wherein one of the first internal bias lines connected to the first external bias line has the first pattern shortest in a length thereof compared with the other first patterns involved in the other internal bias lines.

2. The optical transceiver of claim 1 ,
wherein the resistor are film resistors formed on the wiring substrate.

3. The optical transceiver of claim 1 ,
wherein the second capacitors have capacitance smaller than capacitance of the first capacitors mounted outside of the wiring substrate.

4. The optical transceiver of claim 1 , wherein the bonding wires connecting the second patterns to the second capacitors mounted on the wiring substrate has lengths substantially equal to each other.

5. The optical transceiver of claim 1 ,
further including a carrier that mounts the wiring substrate thereon,
wherein the carrier further mounts trans-impedance amplifiers thereon each connected to the respective PDs.

6. The optical transceiver of claim 5 ,
wherein the trans-impedance amplifiers are connected to the respective PDs through bonding wires.

7. The optical transceiver of claim 1 ,
further including an external dummy line disposed between the signal lines and the first external bias line in an outside of the optical receiver module, and an internal dummy line in an inside of the optical receiver module,
wherein the internal dummy line provides an auxiliary terminal, a bonding wire, a first pattern connected to the another auxiliary terminal through the bonding wire thereof, a resistor, a second pattern, and a capacitor; the first pattern, the resistor, and the second pattern of the internal dummy line being provided on the wiring substrate, the capacitor of the internal dummy line being mounted on an outside of the wiring substrate, the auxiliary terminal connecting the external dummy line to the internal dummy line, and
wherein the bonding wire and the first pattern of the internal dummy line have a total length shorter than the lengths of the inner bias lines.

8. The optical transceiver of claim 7 ,
further including another external dummy line disposed between the first external bias line and one of the other external bias lines closest to the first external bias line in the outside of the optical receiver module, and another internal dummy line in the inside of the optical receiver module,
wherein the another internal dummy line includes another auxiliary terminal, a bonding wire, a first pattern connected to the another auxiliary terminal of the another internal dummy line with the bonding wire thereof, a resistor, a second pattern, and a capacitor; the first pattern, the resistor, and the second pattern of the another internal dummy line being provided on the wiring substrate; the capacitor of the another internal dummy line being mounted on the outside of the wiring substrate; the another auxiliary terminal of the another internal dummy line connecting the another external dummy line to the another internal dummy line, and
wherein the another internal dummy line have a total length of the bonding wire and the first pattern thereof that is shorter than the total lengths of the inner bias lines.

9. An optical transceiver that transmits a wavelength multiplexed optical signal and receives another wavelength multiplexed optical signal, the optical transceiver comprising:
an optical transmitter module configured to receive driving signals through signal lines, convert the driving signals into transmitting optical signals having respective wavelengths different from each other, and generate the wavelength multiplexed optical signal by multiplexing the transmitting optical signals depending on the wavelengths thereof;
an optical receiver module configured to de-multiplex the another wavelength multiplexed signal into receiving optical signals, and convert the receiving optical signals into receiving signals by photodiodes (PDs);
a bias supply configured to supply biases to respective PDs through external bias lines including first external bias line and other external bias lines, the first external bias line being arranged closest to the signal lines carrying the driving signals to the optical transmitter module; and
an external dummy line disposed between the signal lines and the first external bias line in an outside of the optical receiver module,
wherein the optical receiver module includes a wiring substrate, terminals, internal bias lines connected to the external bias lines through the terminals, an internal dummy line in an inside of the optical receiver module, and an auxiliary terminal, the internal bias lines including bonding wires having substantially even lengths, first patterns, second patterns, and filter units, the first and second patterns being provided on the wiring substrate, the first patterns being connected to the terminals through the bonding wires, the filter units being provided between the first patterns and the second patterns, the filter units including resistors and capacitors constituting RC filters, the resistors connected between the first patterns and the second patterns, the capacitors being connected to the second patterns, the internal dummy line being connected to the external dummy line through the auxiliary terminal,
wherein one of the first internal bias lines connected to the first external bias line has the first pattern shortest in a length thereof compared with the other

Assignees

• Sumitomo Electric Industries

Inventors

• Kasai Shinta
• Nakajima Fumihiro
• Ono Masaaki

Classifications

• H10W72/5449

  not being orthogonal to a side surface of the chip, e.g. fan-out arrangements · CPC title

• H05K1/0218

  by printed shielding conductors, ground planes or power plane (H05K1/0236 takes precedence) · CPC title

• H04B10/40 Primary

  Transceivers · CPC title

• H03H1/02

  RC networks, e.g. filters · CPC title

• G02B6/00

  Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings · CPC title