CN107634806B

CN107634806B - ONU (optical network Unit) receiving sensitivity optimization circuit Based On BOB (BOB) technology

Info

Publication number: CN107634806B
Application number: CN201711023303.5A
Authority: CN
Inventors: 何芯锐; 王旭东; 唐兴刚
Original assignee: Sichuan Tianyi Comheart Telecom Co Ltd
Current assignee: Sichuan Tianyi Comheart Telecom Co Ltd
Priority date: 2017-10-27
Filing date: 2017-10-27
Publication date: 2023-08-18
Anticipated expiration: 2037-10-27
Also published as: CN107634806A

Abstract

The invention discloses a BOB technology-based receiving sensitivity optimization circuit, which comprises a MAC module circuit, a PMD module circuit and a GPON BOSA module circuit, wherein the MAC module circuit is connected with the PMD module circuit, the PMD module circuit is connected with the GPON BOSA module circuit, the GPON BOSA module circuit is added with a grounding path consisting of a 0R resistor (R1) and a 0.1uF capacitor (C2), the grounding path is connected with a receiving monitoring pin of an optical device ROSA in the GPON BOSA module circuit, and the PMD module circuit is connected with a grounding path consisting of a 470R resistor (R2) and a capacitor (C1). The invention solves the problem that the current BOB receiving circuit has low adaptability to optical devices with different performances, and overcomes the problem of adaptability between the optical devices with relatively poor performances and the driving circuit.

Description

ONU (optical network Unit) receiving sensitivity optimization circuit Based On BOB (BOB) technology

Technical Field

The invention relates to the field of photoelectricity, in particular to a receiving sensitivity optimization circuit based on a BOB technology.

Background

In order TO reduce BOSA cost, the method adopts direct purchasing of transmitting and receiving chips, then searches for a TO packaging factory TO package the chips into TO, and then searches for a BOSA manufacturer TO package the TO into BOSA. Therefore, the purchase cost of the device is reduced. However, while the cost of such devices is reduced, there are a number of additional risk-increasing links. TO ensure the consistency and reliability of the devices, the chip, the TO package and the BOSA package must be ensured in practice, and each link meets the requirements. This also increases the cost of handling and verification. However, in fact, it is shown that many device products do have many defects and inconsistencies, which result in problems and high prototype rework rates, and meanwhile, many devices and three-temperature packet loss products with substandard indexes are produced. At present, products of some factories are found in verification devices under the condition of packet loss at three temperatures (-10 ℃ 25 ℃ 55 ℃). The basic condition of the current testing environment is that the ONU is registered on the OLT, and the ONU performs large packet length streaming test near the sensitivity. In the test process, the situation of packet loss of a plurality of products is found when the products are tested at three temperatures, and the situation of packet loss is found to mainly occur in the downlink direction through analysis, namely the ONU end belongs to the receiving end. The TO constitution of the receiving end is further studied intensively, and the chip for receiving the TO is mainly composed of PD+TIA.

The disadvantages of the prior art are: the existing hardware circuit for BOB reception is relatively single, and has low adaptability to various optical devices such as receiving devices in BOSA. The receiving sensitivity of the optical device which can be relatively good is relatively good, but the performance of the optical device is poor, so that the product index is influenced, and the good adaptation and requirements are not met.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides a BOB technology-based receiving sensitivity optimization circuit, solves the problem that the current BOB receiving circuit is not high in adaptability to optical devices with different performances, and overcomes the problem of adaptability between a receiving optical device with relatively poor performances and a driving circuit.

The aim of the invention is realized by the following technical scheme:

the receiving sensitivity optimizing circuit based on the BOB technology comprises a MAC module circuit, a PMD module circuit and a GPON BOSA module circuit, wherein the MAC module circuit is connected with the PMD module circuit, the PMD module circuit is connected with the GPON BOSA module circuit, the GPON BOSA module circuit is added with a grounding path consisting of a 0R resistor and a 0.1uF capacitor, the grounding path is connected with a receiving monitoring pin of an optical device ROSA in the GPON BOSA module circuit, and the PMD module circuit is connected with a grounding path consisting of a 470R resistor and a capacitor.

As a further improvement of the scheme, the C2 capacitor is 0.1uF, and a grounding path formed by the 0R resistor and the 0.1uF capacitor provides a path for filtering noise interference at the GPON BOSA receiving end.

As a further improvement of the scheme, the PMD module circuit is connected with an EEPROM.

The beneficial effects of the invention are as follows: the invention solves the problem that the current BOB receiving circuit has low adaptability to optical devices with different performances, and overcomes the problem of adaptability between the optical devices with relatively poor performances and the driving circuit. According to the invention, the circuit design can be optimized, so that the adaptability of the driving end to more optical device products is better improved, the range of the optical device BOSA is enlarged when the optical device BOSA is selected, the receiving sensitivity index requirement range of the optical device is reduced, and the cost and the risk problem caused by the fact that the product is too dependent on a unique device are further reduced.

Drawings

Fig. 1 is a circuit diagram of the present invention.

Detailed Description

The technical solution of the present invention will be described in further detail with reference to the accompanying drawings, but the scope of the present invention is not limited to the following description.

First, the various shorthand designations described herein are presented as follows:

TOSA: a light emitting assembly;

ROSA: a light receiving assembly;

BOSA: an optical transceiver module;

PMD: physical medium correlation;

MAC: medium access control;

GPON: gigabit passive optical network (Gigabit-Capable Passive Optical Network).

As shown in FIG. 1, the receiving sensitivity optimizing circuit based on the BOB technology comprises a MAC module circuit, a PMD module circuit and a GPON BOSA module circuit, wherein the MAC module circuit is connected with the PMD module circuit, the PMD module circuit is connected with the GPON BOSA module circuit, the GPON BOSA module circuit is additionally provided with a grounding path consisting of a 0R resistor R1 and a 0.1uF capacitor C2, the grounding path is connected with a receiving monitoring pin of an optical device ROSA in the GPON BOSA module circuit, and an RSSI_in pin of the PMD module circuit is grounded through a capacitor C1 and is connected with an RSSI receiving monitoring pin of the ROSA through a resistor 470R resistor R2.

As a further improvement of the scheme, the capacitor C2 is 0.1uF, and a grounding path formed by the resistor R1 and the capacitor C2 provides a path for filtering noise interference at the GPON BOSA receiving end.

Setting and selecting R2 mainly aims at inhibiting interference generated by a driving chip by increasing a resistance value; the purposes of setting and selecting R1 and C2 are mainly as follows: and providing a path for filtering noise interference at the BOSA receiving end. The former emphasizes the drive end and the latter emphasizes the device end.

The principle of the optimization method is mainly to improve the receiving sensitivity of the ONU by reducing noise interference. In this way, the sensitivity of the original relatively poor device can be improved by about 2dbm.

The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.

Claims

1. The receiving sensitivity optimizing circuit based on the BOB technology is characterized in that: the optimizing circuit comprises a MAC module circuit, a PMD module circuit and a GPON BOSA module circuit, wherein the MAC module circuit is connected with the PMD module circuit, the PMD module circuit is connected with the GPON BOSA module circuit, the GPON BOSA module circuit is added with a grounding path consisting of a 0R resistor R1 and a 0.1uF capacitor C2, the grounding path is connected with a receiving monitoring pin of an optical device ROSA in the GPON BOSA module circuit, and the PMD module circuit is connected with a grounding path consisting of a 470R resistor R2 and a capacitor C1.

2. The BOB technique-based reception sensitivity optimization circuit of claim 1, wherein: the capacitor C2 is 0.1uF, and a grounding path formed by the resistor R1 and the capacitor C2 provides a path for filtering noise interference at the GPON BOSA receiving end.

3. The BOB technique-based reception sensitivity optimization circuit of claim 1, wherein: and the PMD module circuit is connected with an EEPROM.