Front end module for optical receiver
AssigneeSumitomo Electric Industries, Ltd.
InventorsMakoto ITO, Sosaku Sawada
Life of this patent
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Abstract
A front end module for an optical receiver is disclosed. The module includes a PD, a trans-impedance amplifier (TIA), an insulating carrier for mounting the PD, and a conductive base for mounting the carrier. The carrier provides first and second metal films thereon. The first metal film carries a photocurrent from the PD to the TIA, while, the second metal film carries the bias supply to the PD. The PD is mounted on the first and second metal films by the flip-chip arrangement. The second metal film surrounds the first metal film to suppress resonances appeared in the trans-impedance spectrum of the front end module.
Claims17
A front end module for an optical receiver, comprising:
- a light-receiving device that generates a photocurrent provided with a bias supply;
- a trans-impedance amplifier that receives the photocurrent from the light-receiving device through a first bonding wire, the trans-impedance amplifier providing a ground;
- a carrier made of electrically insulating material, the carrier including a first metal film, a second metal film, and a third metal film, the first metal film connecting the light-receiving device with the first bonding wire to carry the photocurrent thereon, the second metal film surrounding the first metal film and carrying the bias supply to the light-receiving device, the third metal film arranged outside of the second metal film with respect to the first metal film, the first metal film and the second metal film mounting the light-receiving device in an arrangement of a flip-chip bonding;
- and
- an electrically conductive base that mounts the carrier and the trans-impedance amplifier thereon,
- wherein the third metal film is connected with the second metal film through a resistor to constitute a series circuit of the resistor and a capacitor attributed to the third metal film against the base.
A front end module for an optical receiver, comprising:
- a photodiode for outputting a photocurrent in an anode electrode thereof biased with a bias supply in a cathode electrode thereof;
- a trans-impedance amplifier for receiving the photocurrent, the trans-impedance amplifier having a signal ground;
- an insulating carrier having a first metal film, a second metal film, and a third metal film, the first metal film carrying the photocurrent from the photodiode to the trans-impedance amplifier, the second metal film supplying the bias supply to the photodiode and surrounding the first metal film, the third metal film being put outside of the second metal film with respect to the first metal film and floating from the signal ground, the photodiode being mounted on the first metal film and the second metal film in a front surface of the insulating carrier by a flip-chip arrangement;
- and
- an electrically conductive base for mounting the insulating carrier and the trans-impedance amplifier thereon, the base providing the signal ground,
- wherein the carrier further includes a thin film resistor connecting the third metal film to the second metal film to form a series circuit of the thin film resistor and a capacitor attributed to the third metal film against the base between the second metal film and the signal ground.
Dependencies are inferred from the claim text.